Derivative Instruments and Hedging Activities Fair Value [Abstract] Derivative Instruments and Hedging Activities Fair Value [Abstract] Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Fair Value, Inputs, Level 2 [Member] Fair Value, Inputs, Level 2 [Member] Hedging Relationship [Axis] Hedging Relationship [Axis] Hedging Relationship [Domain] Hedging Relationship [Domain] Cash Flow Hedging [Member] Cash Flow Hedging [Member] Derivative Instrument [Axis] Derivative Instrument [Axis] Derivative Contract [Domain] Derivative Contract [Domain] Interest Rate Swap [Member] Interest Rate Swap [Member] Hedging Designation [Axis] Hedging Designation [Axis] Hedging Designation [Domain] Hedging Designation [Domain] Designated as Hedging Instrument [Member] Designated as Hedging Instrument [Member] Balance Sheet Location [Axis] Balance Sheet Location [Axis] Balance Sheet Location [Domain] Balance Sheet Location [Domain] Derivatives, Fair Value [Line Items] Derivatives, Fair Value [Line Items] Unrealized Gain (Loss) on Derivatives Unrealized Gain (Loss) on Derivatives Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net Interest Rate Derivative Assets, at Fair Value Interest Rate Derivative Assets, at Fair Value Number of Interest Rate Derivatives Held Number of Interest Rate Derivatives Held Interest Rate Derivative Liabilities, at Fair Value Interest Rate Derivative Liabilities, at Fair Value Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net Payments for (Proceeds from) Hedge, Financing Activities Derivative, Cash Received on Hedge Stockholders' Equity Note [Abstract] Common Shares [Text Block] Stockholders' Equity Note Disclosure [Text Block] Notes Payable [Abstract] Schedule of Long-term Debt Instruments [Table] Schedule of Long-term Debt Instruments [Table] Short-term Debt, Type [Axis] Short-term Debt, Type [Axis] Short-term Debt, Type [Domain] Short-term Debt, Type [Domain] Unsecured Credit Facility [Member] Line of Credit [Member] Letter of Credit [Member] Letter of Credit [Member] Statistical Measurement [Axis] Statistical Measurement [Axis] Statistical Measurement [Domain] Statistical Measurement [Domain] Minimum [Member] Minimum [Member] Maximum [Member] Maximum [Member] Long-term Debt, Type [Axis] Long-term Debt, Type [Axis] Long-term Debt, Type [Domain] Long-term Debt, Type [Domain] 2.70% Term loan Due 2022 Term loan, due 2022 [Member] Term loan, due 2022 [Member] 4.78% Notes Due 2021 Four Point Seven Eight Percentage Notes Due2021 [Member] Four Point Seven Eight Percentage Notes Due2021 3.15% Notes Due 2022 Three Point One five Percentage Notes Due 2022 [Member] Three Point One five Percentage Notes Due 2022 5.07% Notes Due 2023 Five Point Zero Seven Percentage Notes Due 2023 [Member] Five Point Zero Seven Percentage Notes Due 2023 4.36% Notes Due 2024 Four Point Three Six Percentage Notes Due 2024 [Member] Four Point Three Six Percentage Notes Due 2024 3.68% Notes Due 2024 Three Point Six Eight Percentage Notes Due 2024 [Member] Three Point Six Eight Percentage Notes Due 2024 3.74% Notes Due 2028 Unsecured notes 3.74% due 2028 [Member] Unsecured notes 3.74% due 2028 [Member] 3.67% Notes due 2029 Unsecured notes 3.67% due 2029 [Member] Unsecured notes 3.67% due 2029 [Member] 3.41% Notes due 2049 Unsecured notes 3.41% due 2049 [Member] Unsecured notes 3.41% due 2049 [Member] Secured Notes 4.38% Fixed Rate Mortgage Note Due 2045 [Member] Secured Notes 4.38% Fixed Rate Mortgage Note Due 2045 [Member] Secured Notes 4.38% Fixed Rate Mortgage Note Due 2045 [Member] Secured Notes 5.19% Fixed Rate Note Due 2019 [Member] Secured Notes 5.19% Fixed Rate Note Due 2019 [Member] Secured Notes 5.19% Fixed Rate Note Due 2019 [Member] Secured Notes 5.33% Fixed Rate Mortgage Note Due 2019 [Member] Secured Notes 5.33% Fixed Rate Mortgage Note Due 2019 [Member] Secured Notes 5.33% Fixed Rate Mortgage Note Due 2019 [Member] Debt Instrument [Axis] Debt Instrument [Axis] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Commercial Banks [Member] Commercial Banks [Member] Commercial Banks. Unsecured Debt [Member] Unsecured Debt [Member] Senior Unsecured Notes [Member] Senior Unsecured Notes [Member] Senior unsecured notes. Secured Debt [Member] Secured Debt [Member] Statement [Line Items] Statement [Line Items] Unsecured Debt Secured notes payable Secured Debt Total notes payable Notes Payable Notes payable, effective interest rate Debt Instrument, Interest Rate, Effective Percentage Debt Instrument, Maturity Date Debt Instrument, Maturity Date Value Of Real Estate Assets At Cost Subject To Secured Notes Value Of Real Estate Assets At Cost Subject To Secured Notes Value of real estate assets, at cost, as of the balance sheet date that are subject to secured notes payable. Equity Method Investments and Joint Ventures [Abstract] Aggregate Balance Sheet And Statement Of Income Data For Unconsolidated Joint Ventures Equity Method Investments [Table Text Block] Operating Partnerships [Abstract] Operating Partnerships [Abstract] Statement [Table] Statement [Table] Subsequent Event Type [Axis] Subsequent Event Type [Axis] Subsequent Event Type [Domain] Subsequent Event Type [Domain] Subsequent Event [Member] Subsequent Event [Member] Legal Entity [Axis] Legal Entity [Axis] Entity [Domain] Entity [Domain] Camden Operating L P [Member] Camden Operating L P [Member] Camden Operating LP [Member] Camden Summit Partnership L P [Member] Camden Summit Partnership L P [Member] Camden Summit Partnership LP [Member] Percentage Of Real Estate Properties Held With Operating Partnership Percentage Of Real Estate Properties Held With Operating Partnership Percentage of real estate properties held with operating partnership. Units of Partnership Interest, Amount Units of Partnership Interest, Amount Limited Liability Company or Limited Partnership, Members or Limited Partners, Ownership Interest Limited Liability Company or Limited Partnership, Members or Limited Partners, Ownership Interest Limited Liability Company (LLC) or Limited Partnership (LP), Managing Member or General Partner, Ownership Interest Limited Liability Company (LLC) or Limited Partnership (LP), Managing Member or General Partner, Ownership Interest Limited Partners' Capital Account, Units Outstanding Limited Partners' Capital Account, Units Outstanding Debt Instrument, Face Amount Debt Instrument, Face Amount Amount indemnified by unitholders of partnership Amount indemnified by unitholders of partnership Amount indemnified by CSPLP unitholder whom are also Trust Managers for their portion of the unsecured debt equal to the amount of income and gain which would be required to be recognized by the unitholder due to their negative tax capital account. Income Tax Disclosure [Abstract] Operating Loss Carryforwards, Expiration Dates Operating Loss Carryforwards, Expiration Date Difference Between Carry Value Of Net Assets And Tax Basis Of Net Assets Difference Between Carry Value Of Net Assets And Tax Basis Of Net Assets The amount as of the balance sheet date of the difference between the tax basis of capital assets and the basis of capital assets computed in accordance with generally accepted accounting principles. The difference in basis, attributable to different capitalization of costs, depreciation, or amortization methodologies, will increase future taxable income when such basis difference is realized. Capital assets include but are not limited to assets such as land, real estate, leasehold improvements, machinery and equipment and furniture and fixtures. Income tax expense Current Income Tax Expense (Benefit) Annual dividends distribution percentage to shareholders to qualify as a REIT Annual Dividend Distribution Percentage To Shareholders To Qualify As Real Estate Investment Trust As a Real Estate Investment Trust (REIT), we are required to distribute annual dividends to shareholders to qualify as a REIT equal to a minimum percentage of 90% of REIT taxable income, computed without regard to the dividends paid deduction and net capital gains. Significant temporary differences or tax credits associated with our taxable REIT subsidiaries Deferred Tax Liability Not Recognized, Amount of Unrecognized Deferred Tax Liability, Undistributed Earnings of Domestic Subsidiaries Uncertain tax positions or unrecognized tax benefits Unrecognized Tax Benefits SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Abstract] Mortgage Loans on Real Estate Table [Table Text Block] Mortgage Loans on Real Estate Table [Table Text Block] Mortgage Loans on Real Estate Table [Table Text Block] Changes in Mortgage Loans [Table Text Block] Changes in Mortgage Loans [Table Text Block] Changes in Mortgage Loans [Table Text Block] Description of Business [Abstract] Description of Business [Abstract] Number of multifamily communities comprising of apartment homes Number Of Multifamily Communities The total number of real estate properties the company owned interests in, operated, or were developing as of the balance sheet date. Total number of apartment homes in multifamily communities Total Number Of Apartment Homes In Multifamily Communities The total number of units in real estate properties the company owned interests in, operated, or were developing as of the balance sheet date. Number of multifamily properties under development Number of Multifamily Properties Under Development The number of real estate properties under development the company owned interests in or fully owned as of the balance sheet date. Total number of apartment homes in multifamily properties upon completion of development Total Number of Apartment Homes in Multifamily Properties Upon Completion Of Development The number of units in the real estate properties under development the company owned interests in or fully owned as of the balance sheet date which will be added upon completion of development. Statement of Financial Position [Abstract] Scenario [Axis] Scenario [Axis] Scenario [Domain] Scenario [Domain] Class of Stock [Axis] Class of Stock [Axis] Class of Stock [Domain] Class of Stock [Domain] Assets Assets [Abstract] Land Land Buildings and improvements Investment Building and Building Improvements Real estate assets, at cost, total Real estate assets, at cost, total The value of land and buildings and improvement before accumulated depreciation. Accumulated depreciation Real Estate Investment Property, Accumulated Depreciation Net operating real estate assets Net operating real estate assets The net book value of land and buildings and improvement. Properties under development, including land Properties under development including land The current amount of expenditures for a real estate project that has not yet been completed including the carrying amount of land available for development. Investments in joint ventures Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures Total real estate assets Real Estate Assets Total Total net real estate assets, including investments in joint ventures. Accounts receivable – affiliates Accounts Receivable, Related Parties Other assets, net Other Assets Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Restricted cash Restricted Cash and Cash Equivalents Total assets Assets Liabilities and equity Liabilities and Equity [Abstract] Liabilities Liabilities [Abstract] Unsecured notes payable Accounts payable and accrued expenses Accounts Payable and Accrued Liabilities Accrued real estate taxes Accrual for Taxes Other than Income Taxes Distributions payable Distributions payable Carrying value as of the balance sheet date of dividends declared but unpaid on equity securities issued by the entity and outstanding, in addition to distributions due to real estate partnerships. Other liabilities Other Liabilities Total liabilities Liabilities Commitments and contingencies (Note 14) Commitments and Contingencies Non-qualified deferred compensation share awards Temporary Equity, Carrying Amount, Including Portion Attributable to Noncontrolling Interests Equity Stockholders' Equity Attributable to Parent [Abstract] Common shares of beneficial interest; $0.01 par value per share; 175,000 shares authorized; 109,110 and 105,503 issued; 106,878 and 103,080 outstanding at December 31, 2019 and 2018, respectively Common Stocks Value Outstanding Value of all classes of common stock held by shareholders (excluding shares held in our deferred compensation arrangements); including treasury stock. May be all or a portion of the number of common shares authorized. These shares represent the ownership interest of the common shareholders. Additional paid-in capital Additional Paid in Capital, Common Stock Distributions in excess of net income attributable to common shareholders Accumulated Distributions in Excess of Net Income Treasury shares, at cost (9,636 and 9,841 common shares, at December 31, 2019 and 2018, respectively) Treasury Stock, Value Accumulated other comprehensive income (loss) Accumulated Other Comprehensive Income (Loss), Net of Tax Total common equity Stockholders' Equity Attributable to Parent Non-controlling interests Stockholders' Equity Attributable to Noncontrolling Interest Total equity Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Total liabilities and equity Liabilities and Equity Secured Notes Fixed Rate Debt due 2019 [Member] Secured Notes Fixed Rate Debt due 2019 [Member] Secured Notes Fixed Rate Debt due 2019 [Member] Floating Rate Notes Payable [Member] Floating Rate Notes Payable [Member] Floating Rate Notes Payable [Member] Secured Notes 4.38% Fixed Rate Note Due 2045 [Member] Secured Notes 4.38% Fixed Rate Note Due 2045 [Member] Secured Notes 4.38% Fixed Rate Note Due 2045 [Member] Letter Of Credit [Member] Secured Debt Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net Current Fiscal Year End Date Current Fiscal Year End Date Value not exceeding the amount available under the unsecured credit facility Value not exceeding the amount available under the line of credit Advances under the line of credit may be priced at the scheduled rates, or we may enter into bid rate loans with participating banks at rates below the scheduled rates. These bid rate loans have terms of 180 days or less and may not exceed the lesser of $250 million or the remaining amount available under the line of credit. Maximum Ability to Issue Letters of Credit Under Unsecured Credit Facility Maximum Ability to Issue Letters of Credit Under Unsecured Credit Facility Maximum Ability to Issue Letters of Credit Under Unsecured Credit Facility Unsecured Debt Amount of current borrowing capacity under unsecured credit facility Line of Credit Facility, Current Borrowing Capacity Line of Credit Facility, Maximum Borrowing Capacity Line of Credit Facility, Maximum Borrowing Capacity Terms Of Bid Rate Loans Terms Of Bid Rate Loans Maximum term of bid rate loans in days related to the line of credit. Advances under the line of credit may be priced at the scheduled rates, or we may enter into bid rate loans with participating banks at rates below the scheduled rates Loss on early retirement of debt Gain (Loss) on Extinguishment of Debt Outstanding balance under credit facility Long-term Line of Credit Available amount under unsecured credit facility Line of Credit Facility, Remaining Borrowing Capacity Repayments of Secured Debt Repayments of Secured Debt Payment for Debt Extinguishment or Debt Prepayment Cost Payment for Debt Extinguishment or Debt Prepayment Cost Weighted average interest rate on floating rate debt Debt, Weighted Average Interest Rate Weighted average maturity of indebtedness (including unsecured credit facility and unsecured short-term borrowings) (in years) Weighted Average Maturity Of Indebtedness Including Unsecured Line Of Credit Weighted Average Maturity Of Indebtedness Including Unsecured Line Of Credit Debt Instrument, Interest Rate, Stated Percentage Debt Instrument, Interest Rate, Stated Percentage Discounted notes payable face amount Discounted notes payable face amount The discount percentage applied to the new notes payable face amount for the public offering of the debt. Derivative, Notional Amount Derivative, Notional Amount Debt Instrument, Interest Rate Before June 2026 Debt Instrument, Interest Rate Before June 2026 Debt Instrument, Interest Rate On 2029 Notes Before June 2026. Debt Instrument, Interest Rate After June 2026 Debt Instrument, Interest Rate After June 2026 Debt Instrument, Interest Rate on 2029 Notes After June 2026. Debt Instrument, Interest Rate During Period Debt Instrument, Interest Rate During Period Proceeds from Issuance of Debt Proceeds from Issuance of Debt Share-based compensation and benefit plans [Abstract] Share-based compensation and benefit plans [Abstract] Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term Share Offering Program [Axis] Share Offering Program [Axis] Share Offering Program [Axis] Share Offering Program [Domain] Share Offering Program [Domain] Share Offering Program [Domain] Two thousand fourteen ATM program [Domain] Two thousand fourteen ATM program [Domain] Two thousand fourteen ATM program [Domain] Activity Under At-The-Market Share Offering Program Activity under Atm share offering program Text Block Activity Under ATM Share Offering Program. Quarterly Financial Data [Abstract] Quarterly Financial Data [Text Block] Quarterly Financial Information [Text Block] Share-based Payment Arrangement, Noncash Expense [Abstract] Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] Exercised/Vested, Options Outstanding Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward] Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Nonvested share awards outstanding, Beginning balance Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number Granted, Share Awards Outstanding Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period Exercised/Vested, Share Awards Outstanding Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period Forfeited, Share Awards Outstanding Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period Nonvested share awards outstanding, Ending balance Nonvested share awards outstanding, Weighted Average Exercise/Grant Price Beginning Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value Granted, Weighted Average Exercise/Grant Price Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Exercised/Vested, Weighted Average Exercise/Grant Price Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value Forfeited, Weighted Average Exercise/Grant Price Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value Nonvested share awards outstanding, Weighted Average Exercise/Grant Price Ending Property, Plant and Equipment [Abstract] Acquisitions, Dispositions, Impairment, and Discontinued Operations [Text Block] Property Acquisitions Dispositions Impairments Assets held for sale and Discontinued Operations Disclosure [Text Block] [Text Block] Property Acquisitions Dispositions Impairments Assets held for sale and Discontinued Operations Disclosure [Text Block] [Text Block] Increase (Decrease) in Operating Capital [Abstract] Effect Of Changes In The Operating Accounts On Cash Flows From Operating Activities Cash Flow, Operating Capital [Table Text Block] Earnings Per Share [Abstract] Number of common share equivalent securities excluded from the diluted earnings per share calculation Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent Amount allocated to participating securities Participating Securities, Distributed and Undistributed Earnings (Loss), Basic Net Income (Loss) Available to Common Stockholders, Basic Net Income (Loss) Available to Common Stockholders, Basic Total earnings per common share - basic Earnings Per Share, Basic Weighted average number of common shares outstanding – basic Weighted Average Number of Shares Outstanding, Basic Income allocated to common units from continuing operations Dilutive Securities, Effect on Basic Earnings Per Share, Dilutive Convertible Securities Net income attributable to common shareholders - diluted Net Income (Loss) Available to Common Stockholders, Diluted Total earnings per common share - diluted Earnings Per Share, Diluted Common share options and share awards granted Common share options and share awards granted Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method and incremental common shares attributable to participating nonvested shares with non-forfeitable dividend rights using the two class method. Common units Incremental Common Shares Attributable to Dilutive Effect of Conversion of Preferred Stock Weighted average number of common shares outstanding - diluted Weighted Average Number of Shares Outstanding, Diluted SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation Disclosure [Abstract] Schedule III - Real Estate and Accumulated Depreciation [Text Block] SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation Disclosure [Text Block] Accounting Policies [Abstract] New Accounting Pronouncements or Change in Accounting Principle [Table] New Accounting Pronouncements or Change in Accounting Principle [Table] Property Revenue [Axis] Property Revenue [Axis] Property Revenue [Axis] Property Revenue [Domain] Property Revenue [Domain] [Domain] for Property Revenue [Axis] Residential Leases [Member] Residential Leases [Member] Residential Leases [Member] Product and Service [Axis] Product and Service [Axis] Product and Service [Domain] Product and Service [Domain] Real Estate, Other [Member] Real Estate, Other [Member] New Accounting Pronouncements or Change in Accounting Principle [Line Items] New Accounting Pronouncements or Change in Accounting Principle [Line Items] Amortization of in-place leases Amortization of Intangible Assets Amortization of Below Market Lease Amortization of Below Market Lease Capitalized interest Interest Costs Capitalized Capitalized real estate taxes Capitalized Real Estate Taxes The amount of real estate or property taxes that were capitalized during the period. Property revenues Revenue from Contract with Customer, Excluding Assessed Tax Operating Leases, Income Statement, Minimum Lease Revenue Operating Leases, Income Statement, Minimum Lease Revenue Lessor, Operating Lease, Term of Contract Lessor, Operating Lease, Term of Contract Proceeds from Collection of Notes Receivable Proceeds from Collection of Notes Receivable Proceeds from Interest Received Proceeds from Interest Received Outstanding notes receivable SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate Weighted average interest rate on outstanding notes receivable SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate, Interest Rate Percentage Of Rental Revenue And Other Income From Leasing Of Apartment Homes Percentage Of Rental Revenue And Other Income From Leasing Of Apartment Homes Percentage of our total property revenues and total non-property income from leasing of apartment homes, excluding income on deferred compensation plans. Notes Payable Debt Disclosure [Text Block] Revenue Recognition and Deferred Revenue [Abstract] Commitments and Contingencies Disclosure [Abstract] Commitment And Contingencies [Table] Commitment And Contingencies [Table] Commitment and contingencies [Table] Hurricane [Axis] Hurricane [Axis] Expenses incurred for repairs of property damage. Hurricane [Domain] Hurricane [Domain] [Domain] for Expenses incurred for repairs of property damage. Hurricane [Member] Hurricane [Member] Consolidated Entities [Axis] Consolidated Entities [Axis] Consolidated Entities [Domain] Consolidated Entities [Domain] Partnership Interest [Member] Partnership Interest [Member] Refundability of deposit [Axis] Refundability of deposit [Axis] Refundability of deposit related to potential purchase of real estate property Refundability of deposit [Domain] Refundability of deposit [Domain] [Domain] for Refundability of deposit related to potential purchase of real estate property Lessee, Operating Lease, Liability, Payments, Due 2020 Lessee, Operating Lease, Liability, Payments, Due Next Twelve Months Lessee, Operating Lease, Liability, Payments, Due 2021 Lessee, Operating Lease, Liability, Payments, Due Year Two Lessee, Operating Lease, Liability, Payments, Due 2022 Lessee, Operating Lease, Liability, Payments, Due Year Three Lessee, Operating Lease, Liability, Payments, Due 2023 Lessee, Operating Lease, Liability, Payments, Due Year Four Lessee, Operating Lease, Liability, Payments, Due 2024 Lessee, Operating Lease, Liability, Payments, Due Year Five Lessee, Operating Lease, Liability, Payments, Due Thereafter Lessee, Operating Lease, Liability, Payments, Due after Year Five Lessee, Operating Lease, Liability, Undiscounted Excess Amount Lessee, Operating Lease, Liability, Undiscounted Excess Amount Number of Operating properties Acquired Number of Operating properties Acquired Number of operating properties acquired which are now fully consolidated during the period. Number of consolidated projects under construction Number of consolidated projects under construction Number of consolidated projects under construction Anticipated expenditures relating to completion of construction type contracts Anticipated Expenditures Relating To Completion Of Construction Type Contracts General description of anticipated expenditures which may be required in performing under a construction-type contract at the balance sheet date. Earnest Money Deposits Earnest Money Deposits Operating Lease, Right-of-Use Asset Operating Lease, Right-of-Use Asset Operating Lease, Liability Operating Lease, Liability Rent expense related to operating lease liabilities Operating Lease, Cost Variable Lease, Cost Variable Lease, Cost Cash flows from operating leases Operating Lease, Payments Operating Lease, Weighted Average Remaining Lease Term Operating Lease, Weighted Average Remaining Lease Term Operating Lease, Weighted Average Discount Rate, Percent Operating Lease, Weighted Average Discount Rate, Percent Rental expense Operating Leases, Rent Expense Less than joint venture economic interest noted Economic Interest In Joint Ventures Economic interest in the community or land owned directly by the joint venture or partnership is less than this amount in order to qualify as a joint venture or partnership. Operating Leases, Future Minimum Payments Due, Next Twelve Months Operating Leases, Future Minimum Payments Due, Next Twelve Months Operating Leases, Future Minimum Payments, Due in Two Years Operating Leases, Future Minimum Payments, Due in Two Years Operating Leases, Future Minimum Payments, Due in Three Years Operating Leases, Future Minimum Payments, Due in Three Years Operating Leases, Future Minimum Payments, Due in Four Years Operating Leases, Future Minimum Payments, Due in Four Years Operating Leases, Future Minimum Payments, Due in Five Years Operating Leases, Future Minimum Payments, Due in Five Years Operating Leases, Future Minimum Payments, Due Thereafter Operating Leases, Future Minimum Payments, Due Thereafter Increase (Decrease) in Earnest Money Deposits Outstanding Increase (Decrease) in Earnest Money Deposits Outstanding Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Plan Name [Axis] Plan Name [Axis] Plan Name [Domain] Plan Name [Domain] Two Thousand Eighteen Share Incentive Plan [Member] Two Thousand Eighteen Share Incentive Plan [Member] Two Thousand Eighteen Share Incentive Plan [Member] Award Type [Axis] Award Type [Axis] Award Type [Domain] Award Type [Domain] Options [Member] Share-based Payment Arrangement, Option [Member] Share Awards and Vesting [Member] Share Awards And Vesting [Member] Share Awards and Vesting [Member] Total fungible units to be issued Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant Fungible Units To Full Value Award Conversion Ratio Fungible Units To Full Value Award Conversion Ratio The award conversion ratio regarding the shares from the 2002 share incentive plan transferred into the 2011 share incentive plan. Full Value award in the fungible unit conversion ratio Full Value award in the fungible unit conversion ratio The full value award in the fungible unit to full value award conversion ratio regarding the shares from the 2002 share incentive plan transferred into the 2011 share incentive plan. Expiration value of option right or other award Value Of Option Right Or Other Award In The Fungible Unit Conversion An option, right, or other award which does not deliver the full value at date of grant and expires five years or less from the date of grant counts against the Fungible Pool Limit as this portion of a fungible pool unit Common shares which could be granted pursuant to full value awards Common Shares Which Could Be Granted Pursuant To Full Value Awards Common shares which could be granted pursuant to full value awards based on the 3.45 to 1.0 fungible unit-to-full value award conversion ratio. Total intrinsic value of options exercised during the period Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value Total unrecognized compensation cost related to unvested options which is expected to be amortized Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount Vesting period, years Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Fair value of shares vested Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value Total compensation cost for option and share awards Share Based Compensation Arrangement By Share Based Payment Award Compensation Cost For Period Equity-based compensation cost during the period with respect to the award, which was recognized in income. Total capitalized compensation cost for option and share awards Share-based Payment Arrangement, Amount Capitalized Percentage Of Market Value Per Share At Which Shares Purchased Under Employee Share Purchase Plan Percentage Of Market Value at Which Shares Purchased Under Employee Share Purchase Plan The percentage of market value per share at which shares may be purchased under our employee share purchase plan EmployeeSharePurchasePlanMaximumAuthorizedAmountPerParticipant EmployeeSharePurchasePlanMaximumAuthorizedAmountPerParticipant Maximum authorized purchase amount of shares during any plan year per participant for our employee share purchase plan. Share Awards Held In Employee Trust Shares Share Awards Held In Employee Trust Shares The total amount of share awards held in a Rabbi Trust. Share Awards Held In Non Qualified Deferred Compensation Plan Shares Trading Securities Held In Employee Trust Value Market value of trading securities held in a rabbi trust. Cash Required By Plan Participants Upon Withdrawal Cash Required By Plan Participants Upon Withdrawal Cash required to be paid to us by plan participants upon the withdrawal of any assets from the trust and is included in accounts receivable - affiliates in our consolidated financial statements. Defined Contribution Plan, Cost Defined Contribution Plan, Cost Number of shares diversified shares diversified shares diversified Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition Employee Share Purchase Program maximum shares available Employee Share Purchase Program maximum shares available Employee Share Purchase Program maximum shares available under the 2018 ESPP Share plan Share Awards Held In Non Qualified Deferred Compensation Plan Shares Share Awards Held In Non Qualified Deferred Compensation Plan Shares The total amount of share awards held in a non-qualified deferred compensation plan. Trading Securities Held In Non Qualified Deferred Compensation Plan Value Trading Securities Held In Non Qualified Deferred Compensation Plan Value Market value of trading securities held in a non-qualified deferred compensation plan. Stock Issued During Period, Shares, Employee Stock Purchase Plans Stock Issued During Period, Shares, Employee Stock Purchase Plans Weighted Average Fair Value Of Shares Purchased Under Employee Share Purchase Plan Weighted Average Fair Value Of Shares Purchased Under Employee Share Purchase Plan Weighted average fair value of shares purchased during the period related to the employee share purchase plan. Employee Stock Ownership Plan (ESOP), Compensation Expense Employee Stock Ownership Plan (ESOP), Compensation Expense Share-Based Compensation and Benefit Plans Share-based Payment Arrangement [Text Block] Commitments And Contingencies Commitments and Contingencies Disclosure [Text Block] Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block] Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block] Schedule of Derivative Instruments, Effect on Other Comprehensive Income (Loss) [Table Text Block] Schedule of Derivative Instruments, Effect on Other Comprehensive Income (Loss) [Table Text Block] Calculation Of Basic And Diluted Earnings Per Share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Common shares, par value, per share Common Stock, Par or Stated Value Per Share Common shares, authorized Common Stock, Shares Authorized Common shares, issued Common Stock, Shares, Issued Common shares, outstanding Common Shares Outstanding Including Treasury Shares Total number of shares of common stock held by shareholders (excluding shares held in our deferred compensation arrangements), including treasury stock. May be all or a portion of the number of common shares authorized. These shares represent the ownership interest of the common shareholders. Treasury shares, at cost Treasury Stock, Shares Derivative Instruments and Hedging Activities Disclosure [Abstract] Derivative Instruments, Gain (Loss) [Table] Derivative Instruments, Gain (Loss) [Table] Income Statement Location [Axis] Income Statement Location [Axis] Income Statement Location [Domain] Income Statement Location [Domain] Other Comprehensive Income Location [Axis] Other Comprehensive Income Location [Axis] Other Comprehensive Income Location [Domain] Other Comprehensive Income Location [Domain] Derivative Instruments, Gain (Loss) [Line Items] Derivative Instruments, Gain (Loss) [Line Items] Derivative, Cash Paid on Hedge Derivative, Cash Paid on Hedge Derivative, Cash Paid on Hedge Document Period End Date Document Period End Date Net Change In Operating Accounts Effect Of Changes In The Operating Accounts On Cash Flows From Operating Activities [Text Block] Entire disclosure of the net increase (decrease) in operating capital in the operating section of the statement of cash flows, and represents the entire footnote disclosure that provides details regarding the net change during the reporting period of all assets and liabilities used in operating activities. Per Share Data Earnings Per Share [Text Block] Derivative Instruments and Hedging Activities Disclosure [Text Block] Derivative Instruments and Hedging Activities Disclosure [Text Block] Summary Of Indebtedness Schedule of Long-term Debt Instruments [Table Text Block] Scheduled Repayments On Outstanding Debt Schedule of Maturities of Long-term Debt [Table Text Block] Income Taxes Income Tax Disclosure [Text Block] Document And Entity Information [Abstract] Document and Entity Information. Entities [Table] Entities [Table] Entity Information [Line Items] Entity Information [Line Items] Document Type Document Type Title of 12(b) Security Title of 12(b) Security City Area Code City Area Code Local Phone Number Local Phone Number Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Document Annual Report Document Annual Report Document Transition Report Document Transition Report Entity Tax Identification Number Entity Tax Identification Number Entity Address, Address Line One Entity Address, Address Line One Entity Address, City or Town Entity Address, City or Town Entity Address, State or Province Entity Address, State or Province Entity Address, Postal Zip Code Entity Address, Postal Zip Code Security Exchange Name Security Exchange Name Entity Filer Category Entity Filer Category Entity Small Business Entity Small Business Entity Emerging Growth Company Entity Emerging Growth Company Entity File Number Entity File Number Entity Registrant Name Entity Registrant Name Entity Central Index Key Entity Central Index Key Trading Symbol Trading Symbol Amendment Flag Amendment Flag Entity Shell Company Entity Shell Company Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Entity Current Reporting Status Entity Current Reporting Status Entity Interactive Data Current Entity Interactive Data Current Entity Well-known Seasoned Issuer Entity Well-known Seasoned Issuer Entity Voluntary Filers Entity Voluntary Filers Entity Public Float Entity Public Float Share Price Share Price Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Summary Of Share Incentive Plans Share-based Payment Arrangement, Activity [Table Text Block] Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] Schedule of Share-based Compensation, Employee Stock Purchase Plan, Activity [Table Text Block] Schedule of Share-based Compensation, Employee Stock Purchase Plan, Activity [Table Text Block] Temporary Equity [Table Text Block] Temporary Equity [Table Text Block] Share Based Compensation Awards (Deferred Compensation Plan Awards) Table [Abstract] Share Based Compensation Awards (Deferred Compensation Plan Awards) Table [Abstract] Non-qualified deferred compensation share awards Change in classification Change in classification of deferred compensation plan The value of share awards reclassed from additional paid in capital into temporary equity following amendment of the Non-Qualified Deferred Compensation plan permitting diversification of awards into other equity securities subject to a six month holding period and at the holders’ option. Change in redemption value Temporary Equity, Carrying Amount, Period Increase (Decrease) Diversification of share awards Diversification of share awards within deferred compensation plan (Equity) Non-qualified share awards diversified into other equity securities during the period. Non-qualified deferred compensation share awards Activity Under Share Offering Program [Table] Activity Under Share Offering Program [Table] Activity Under Share Offering Program [Table] 2017 ATM program [Member] 2017 ATM program [Member] 2017 ATM program [Member] Maximum aggregate offering price of remaining common shares available for sale Maximum aggregate offering price of remaining common shares available for sale Maximum aggregate offering price of common shares under the at-the-market share offering program available for sale. Total net consideration Stock Issued During Period, Value, New Issues Common shares sold Stock Issued During Period, Shares, New Issues Average Price Per Common Share Sold Average Price Per Common Share Sold The average price per share received for shares of common stock sold under the at-the-market share offering program Statement of Cash Flows [Abstract] Cash flows from operating activities Net Cash Provided by (Used in) Operating Activities [Abstract] Net income Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Adjustments to reconcile net income to net cash from operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Depreciation and amortization Depreciation, Depletion and Amortization Loss on early retirement of debt Gain on sale of operating properties Gain (Loss) on Disposition of Assets Distributions of income from joint ventures Proceeds from Equity Method Investment, Distribution Equity in income of joint ventures Income (Loss) from Equity Method Investments, Net of Dividends or Distributions Share-based compensation Share-based Payment Arrangement, Noncash Expense Net change in operating accounts and other Other Operating Activities, Cash Flow Statement Receipts for settlement of forward interest rate swaps Net cash from operating activities Net Cash Provided by (Used in) Operating Activities Cash flows from investing activities Net Cash Provided by (Used in) Investing Activities [Abstract] Development and capital improvements, including land Payments to Develop Real Estate Assets Acquisition of operating property Payments to Acquire Real Estate Proceeds from sales of operating properties, including land Proceeds from sale of operating properties, including land Proceeds from sale of operating properties, including land. Includes properties which are not designated as discontinued operations, and all land parcels not designated as held for sale. Increase in non-real estate assets Payments to Acquire Other Property, Plant, and Equipment Decrease (increase) in notes receivable Increase (Decrease) in Notes Receivables Maturity of short-term investments Proceeds from Short-term Debt, Maturing in Three Months or Less Other Payments for (Proceeds from) Other Investing Activities Net cash from investing activities Net Cash Provided by (Used in) Investing Activities Cash flows from financing activities Net Cash Provided by (Used in) Financing Activities [Abstract] Borrowings on unsecured credit facility and other short-term borrowings Proceeds from Lines of Credit Repayments on unsecured credit facility and other short-term borrowings Repayments of Lines of Credit Repayment of notes payable Repayments of Notes Payable Proceeds from notes payable Proceeds from Notes Payable Distributions to common shareholders and non-controlling interests Payments of Dividends Payment of deferred financing costs Payments of Financing Costs Proceeds from issuance of common shares Proceeds from Issuance of Common Stock Repurchase of common shares and redemption of units Payments to Noncontrolling Interests Other Proceeds from (Payments for) Other Financing Activities Net cash from financing activities Net Cash Provided by (Used in) Financing Activities Net increase (decrease) in cash, cash equivalents, and restricted cash Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect Cash, cash equivalents, and restricted cash, beginning of year Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Cash, cash equivalents, and restricted cash, end of year Reconciliation of cash, cash equivalents, and restricted cash to the Consolidated Balance Sheets [Abstract] Reconciliation of cash, cash equivalents, and restricted cash to the Consolidated Balance Sheets [Abstract] Cash and cash equivalents Total cash, cash equivalents, and restricted cash Supplemental information Supplemental Cash Flow Information [Abstract] Cash paid for interest, net of interest capitalized Interest Paid, Excluding Capitalized Interest, Operating Activities Cash paid for income taxes Income Taxes Paid Supplemental schedule of noncash investing and financing activities Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract] Distributions declared but not paid Dividends Value of shares issued under benefit plans, net of cancellations Proceeds, Issuance of Shares, Share-based Payment Arrangement, Excluding Option Exercised Accrual associated with construction and capital expenditures Accrual associated with construction and capital expenditures Non-cash accrual associated with construction and capital expenditures and additions to retainage. Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Fair Value Disclosures [Abstract] Fair Value Measurements Fair Value Disclosures [Text Block] Long Lived Assets Held-for-sale by Asset Type [Axis] Long Lived Assets Held-for-sale by Asset Type [Axis] Long Lived Assets Held-for-sale, Name [Domain] Long Lived Assets Held-for-sale, Name [Domain] Disposal Group Classification [Axis] Disposal Group Classification [Axis] Disposal Group Classification [Domain] Disposal Group Classification [Domain] Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] Gain (Loss) on Extinguishment of Debt Gain (loss) on extinguishment of debt per basic share Gain (loss) on extinguishment of debt per basic share Gain (loss) on extinguishment of debt per basic share Gain (loss) on extinguishment of debt per diluted share Gain (loss) on extinguishment of debt per diluted share Gain (loss) on extinguishment of debt per diluted share Gain on sale of operating properties Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property Property revenues Operating Lease, Lease Income Net income attributable to common shareholders Net Income (Loss) Attributable to Parent Number of operating properties sold Number of Real Estate Properties Income loss due to disposition of operating property per basic share Income loss due to disposition of operating property per basic share Income loss due to disposition of operating property per basic share - excludes discontinued operations Income loss due to disposition of operating property per diluted share Income loss due to disposition of operating property per diluted share Income loss due to disposition of operating property per diluted share, excluding discontinued operations Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Table] Fair Value, Recurring and Nonrecurring [Table] Name of Property [Axis] Name of Property [Axis] Name of Property [Domain] Name of Property [Domain] Camden Buckhead Square [Member] Camden Buckhead Square [Member] Camden Buckhead Square Level 1 [Member] Fair Value, Inputs, Level 1 [Member] Level 3 [Member] Fair Value, Inputs, Level 3 [Member] Deferred compensation plan investments Deferred Compensation Plan Assets Participant Withdrawals From Deferred Compensation Plan Investments Participant Withdrawals From Deferred Compensation Plan Investments Participant withdrawals from deferred compensation plan investments Diversification of share awards within deferred compensation plan (Equity) Maturities Due In 2020 [Member] Maturities Due In 2019 [Member] Maturities Due In 2019 [Member] Maturities Due In 2021 [Member] Maturities Due In 2020 [Member] Maturities Due In 2020 [Member] Maturities due in 2022 [Member] Maturities due in 2021 [Member] Maturities due in 2021 [Member] Maturities due in 2023 [Member] Maturities due in 2022 [Member] Maturities due in 2022 [Member] Maturities due in 2024 [Member] Maturities due in 2023 [Member] Maturities due in 2023 [Member] Maturities Due Thereafter [Member] Maturities Due Thereafter [Member] Maturities Due Thereafter [Member] 2020 Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months 2021 Long-term Debt, Maturities, Repayments of Principal in Year Two 2022 Long-term Debt, Maturities, Repayments of Principal in Year Three 2023 Long-term Debt, Maturities, Repayments of Principal in Year Four 2024 Long-term Debt, Maturities, Repayments of Principal in Year Five Thereafter Long-term Debt, Maturities, Repayments of Principal after Year Five Total notes payable Long-term Debt Weighted Average Interest Rate Public Equity Offering [Axis] Public Equity Offering [Axis] Public Equity Offering completed by the Company to sell additional shares of the Company's stock. 2017 Equity Offering [Domain] 2017 Equity Offering [Domain] 2017 Equity Offering [Domain] Share Repurchase Program [Axis] Share Repurchase Program [Axis] Share Repurchase Program [Domain] Share Repurchase Program [Domain] April 2007 Repurchase Plan [Member] April 2007 Repurchase Plan [Member] April 2007 Repurchase Plan [Member] 2019 Equity Offering [Member] Equity Offering Program [Member] Equity Offering Program [Member] Maximum aggregate offering price of common shares Maximum aggregate offering price of common shares Maximum aggregate offering price of common shares under the at-the-market share offering program. Maximum aggregate offering price of remaining common shares available for sale Stock Repurchase Program, Authorized Amount Stock Repurchase Program, Authorized Amount Treasury Stock, Shares, Acquired Treasury Stock, Shares, Acquired Treasury Stock, Value, Acquired, Par Value Method Treasury Stock, Value, Acquired, Par Value Method Stock Repurchase Program, Remaining Authorized Repurchase Amount Stock Repurchase Program, Remaining Authorized Repurchase Amount Number of common and preferred stock authorized to issue Shares Authorized The maximum number of common shares and nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws. Preferred shares, authorized Preferred Stock, Shares Authorized Common Stock, Shares, Outstanding Common Stock, Shares, Outstanding Preferred Stock, Shares Outstanding Preferred Stock, Shares Outstanding Common shares issued Cash distributions declared to equity holders per share Common Stock, Dividends, Per Share, Declared Statement of Stockholders' Equity [Abstract] Equity Components [Axis] Equity Components [Axis] Equity Component Equity Component [Domain] Common Shares Of Beneficial Interest Common Stock [Member] Additional Paid-In Capital Additional Paid-in Capital [Member] Distributions In Excess Of Net Income Accumulated Distributions in Excess of Net Income [Member] Treasury Shares, At Cost Treasury Stock [Member] Accumulated Other Comprehensive Income (Loss) AOCI Attributable to Parent [Member] Noncontrolling Interests Noncontrolling Interest [Member] Equity, Beginning Balance Net Income Net Income Attributable To Common Shareholders And Noncontrolling Interests Net income (loss) attributable to common shareholders and noncontrolling interests, excluding amounts allocated to perpetual preferred units. Other comprehensive income Other Comprehensive Income (Loss), Net of Tax Common shares issued Net share awards Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures Employee share purchase plan Stock Issued During Period, Value, Employee Stock Purchase Plan Common share options exercised Stock Issued During Period, Value, Stock Options Exercised Reclassifications of Temporary to Permanent Equity Reclassifications of Temporary to Permanent Equity Change in classification of deferred compensation plan Change in redemption value of non-qualified share awards Diversification of share awards within deferred compensation plan Conversions and redemptions of operating partnership units Stock Issued During Period, Value, Conversion of Units Cash distributions declared to equity holders Dividends, Common Stock, Cash Other Stockholders' Equity, Other Equity, Ending Balance Principles Of Consolidation Consolidation, Policy [Policy Text Block] Acquisitions of Real Estate Business Combinations Policy [Policy Text Block] Asset Impairment Impairment or Disposal of Long-Lived Assets, Policy [Policy Text Block] Cash, Cash Equivalents, and Short-term Investments Cash, Cash Equivalents, and Short-term Investments [Text Block] Cost Capitalization Property, Plant and Equipment, Policy [Policy Text Block] Derivative Financial Instruments Derivatives, Policy [Policy Text Block] Discontinued Operations Discontinued Operations, Policy [Policy Text Block] Fair Value Fair Value of Financial Instruments, Policy [Policy Text Block] Income Recognition Revenue [Policy Text Block] Reclassifications Reclassification, Policy [Policy Text Block] Insurance Insurance [Policy Text Block] Disclosure of accounting policy for insurance coverage, risks to our multifamily properties, and method of accrual for estimated losses. Other Assets, Net Other Assets, Net [Policy Text Block] Disclosure of accounting policy for other assets in the consolidated financial statements and the accounts that make up the other assets balance. Reportable Segments Segment Reporting, Policy [Policy Text Block] Restricted Cash Cash and Cash Equivalents, Restricted Cash and Cash Equivalents, Policy [Policy Text Block] Share-based Compensation Share-based Payment Arrangement [Policy Text Block] Use of Estimates Use of Estimates, Policy [Policy Text Block] Recent Accounting Pronouncements New Accounting Pronouncements, Policy [Policy Text Block] Schedule IV - Mortgage Loans on Real Estate Schedule [Table] SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate Schedule [Table] Schedule IV - Mortgage Loans on Real Estate, Loan Type [Axis] SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate, Loan Type [Axis] Schedule IV - Mortgage Loans on Real Estate, Loan Type [Domain] SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate, Loan Type [Domain] Parking Garage, Developer Advances [Member] Parking Garage, Developer Advances [Member] Parking Garage, Developer Advances [Member] Schedule IV - Mortgage Loans on Real Estate [Line Items] SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] Federal Income Tax Basis SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate, Federal Income Tax Basis Face Amount of Mortgage Loans SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate, Face Amount of Mortgages Carrying amount of mortgages Interest Rate on Mortgage Loans SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate, Final Maturity Date SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate, Final Maturity Date Other assets, net Increase (Decrease) in Other Operating Assets Accounts payable and accrued expenses Increase (Decrease) in Accounts Payable and Accrued Liabilities Accrued real estate taxes Increase (Decrease) in Property and Other Taxes Payable Other liabilities Increase (Decrease) in Other Operating Liabilities Other Other Noncash Income (Expense) Change in operating accounts and other Increase (Decrease) in Operating Capital Property, Plant and Equipment [Table] Property, Plant and Equipment [Table] Camden Carolinian [Member] Camden Carolinian [Member] Camden Carolinian Camden Highland Village [Member] Camden Highland Village [Member] Camden Highland Village [Member] Camden Rainey Street [Member] Camden Rainey Street [Member] Camden Rainey Street [Member] Camden Old Town Scottsdale [Member] Camden Old Town Scottsdale [Member] Camden Old Town Scottsdale [Member] Camden North Quarter [Member] Camden North Quarter [Member] Camden North Quarter [Member] Camden Thornton Park [Member] Camden Thornton Park [Member] Camden Thornton Park [Member] Camden Pier District [Member] Camden Pier District [Member] Camden Pier District [Member] Camden South Bay [Member] Camden South Bay [Member] Camden South Bay [Member] Camden Highland Village Land [Member] Camden Highland Village Land [Member] Camden Highland Village Land [Member] Camden Hayden II [Member] Camden Hayden II [Member] Camden Hayden II Camden NoDa [Member] Camden NoDa [Member] Camden NoDa [Member] Camden Lake Eola [Member] Camden Lake Eola [Member] Camden Lake Eola [Member] Camden Hillcrest [Member] Camden Hillcrest [Member] Camden Hillcrest [Member] CamdenCopperRidge1 [Member] CamdenCopperRidge1 [Member] CamdenCopperRidge1 [Member] Business Acquisition [Axis] Business Acquisition [Axis] Business Acquisition, Acquiree [Domain] Business Acquisition, Acquiree [Domain] Property, Plant and Equipment [Line Items] Property, Plant and Equipment [Line Items] Area of Land Area of Land Purchase price of land acquired Payments to Acquire Land Proceeds from Sale of Land Held-for-investment Proceeds from Sale of Land Held-for-investment Number of Real Estate Properties Number of Units in Real Estate Property Number of Units in Real Estate Property Payments to Acquire Real Estate Proceeds from Sale of Property, Plant, and Equipment Proceeds from Sale of Property, Plant, and Equipment Schedule III - Real Estate and Accumulated Depreciation [Abstract] Schedule III - Real Estate and Accumulated Depreciation [Abstract] Real Estate, Type of Property [Axis] Real Estate, Type of Property [Axis] Real Estate Properties [Domain] Real Estate [Domain] Current Communities [Member] Current Communities [Member] Current Communities [Member] Construction Communities [Member] Total Construction Communities [Member] Total Construction Communities [Member] Development Pipeline Communities [Member] Development Pipeline Communities [Member] Development Pipeline Communities [Member] Corporate [Member] Corporate Segment [Member] Total Land Holdings and Corporate [Member] Total Land Holdings and Corporate [Member] Total Land Holdings and Corporate [Member] Camden Chandler [Member] Camden Chandler [Member] Camden Chandler [Member] Camden Copper Square [Member] 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Jamboree [Member] Camden Main and Jamboree [Member] Camden Main & Jamboree [Member] Camden Martinique [Member] Camden Martinique [Member] Camden Martinique [Member] Camden Sea Palms [Member] Camden Sea Palms [Member] Camden Sea Palms [Member] The Camden [Member] The Camden [Member] The Camden [Member] Camden Landmark [Member] Camden Landmark [Member] Camden Landmark [Member] Camden Old Creek [Member] Camden Old Creek [Member] Camden Old Creek [Member] Camden Sierra At Otay Ranch [Member] Camden Sierra At Otay Ranch [Member] Camden Sierra at Otay Ranch [Member] Camden Tuscany [Member] Camden Tuscany [Member] Camden Tuscany [Member] Camden Vineyards [Member] Camden Vineyards [Member] Camden Vineyards [Member] Camden Belleview Station [Member] Camden Belleview Station [Member] Camden Belleview Station [Member] Camden Caley [Member] Camden Caley [Member] Camden Caley [Member] Camden Denver West [Member] Camden Denver West [Member] Camden Denver West [Member] Camden Flatirons [Member] 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[Member] Camden Atlantic [Member] Camden Atlantic [Member] Camden Buckhead [Member] Camden Buckhead [Member] Camden Buckhead [Member] Camden Downtown I [Member] Camden Downtown I [Member] Camden Downtown I [Member] Camden North End II [Member] Camden North End II [Member] Camden North End II [Member] Camden RiNo [Member] Camden RiNo [Member] Camden RiNo [Member] Camden Arts District [Member] Camden Arts District [Member] Camden Arts District [Member] Camden Downtown II [Member] Camden Downtown II [Member] Camden Downtown II [Member] Camden Highland Village II [Member] Camden Paces III [Member] Camden Paces III [Member] Camden Paces III [Member] Real Estate and Accumulated Depreciation, Initial Cost of Land SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost of Land Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost of Building and Improvements Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Cost Capitalized Subsequent to Acquisition, Improvements Real Estate and Accumulated Depreciation, Carrying Amount of Land SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Land, Amount Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Building and Improvements, Amount Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross Real Estate and Accumulated Depreciation, Accumulated Depreciation SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation Real Estate And Accumulated Depreciation Total Cost Of Real Estate Assets Net Of Accumulated Depreciation Real Estate And Accumulated Depreciation Total Cost Of Real Estate Assets Net Of Accumulated Depreciation The net book value of each property at the end of the period. Real Estate And Accumulated Depreciation Construction Completion Or Acquisition Date Real Estate And Accumulated Depreciation Construction Completion Or Acquisition Date The construction completion date for the property or the date of acquisition of the property from another party. Share-based Payment Arrangement, Option, Exercise Price Range [Table] Share-based Payment Arrangement, Option, Exercise Price Range [Table] Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Axis] Exercise Price Range [Axis] Exercise Price Range [Domain] Exercise Price Range [Domain] Summary Of Significant Accounting Policies And Recent Accounting Pronouncements Basis Of Presentation Summary Of Significant Accounting Policies And Recent Accounting Pronouncements The summary disclosure for the basis of presentation, or accounting, used to prepare the financial statements, summary of significant accounting policies, and recent accounting pronouncements issued but not yet adopted. Property, Plant and Equipment, Type [Axis] Property, Plant and Equipment, Type [Axis] Property, Plant and Equipment, Type [Domain] Property, Plant and Equipment, Type [Domain] Buildings And Improvements [Member] Building and Building Improvements [Member] Furniture, Fixtures, Equipment, And Other [Member] Furniture and Fixtures [Member] Estimated Useful Life (in years) Property, Plant and Equipment, Useful Life Intangible assets/liabilities (in-place leases and below market leases) Expected useful lives Of Intangible assets Related to in place leases and above and below market leases Expected useful lives of intangible assets related to in-place leases and above and below market leases. Schedule of Quarterly Financial Data [Table Text Block] Quarterly Financial Information [Table Text Block] Balance, beginning of period Advances under real estate loans SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate, New Mortgage Loan Deductions SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate, Collections of Principal Balance, end of period Revenue Recognition Leases, Operating [Policy Text Block] Revenue Recognition Leases, Operating [Policy Text Block] Expected Useful Lives Of Depreciable Property Expected Useful Lives Of Depreciable Property Text Block Expected useful lives of depreciable property including buildings and improvements, furniture, fixtures, equipment and other, and intangible assets such as in-place leases and above and below market leases. Investments In Joint Ventures Equity Method Investments and Joint Ventures Disclosure [Text Block] Balance, beginning of period Acquisition of operating properties and unconsolidated joint ventures SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Other Acquisition Development and repositions Real Estate Development Gross amount at which development properties were added to the carrying value during the period. Improvements SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Improvements Cost of real estate sold – other SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Cost of Investment in Real Estate Sold Balance, end of period Balance, Beginning of period Depreciation of real estate assets SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation, Depreciation Expense Dispositions SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation, Investment in Real Estate Sold Balance, End of period Real Estate, Federal Income Tax Basis SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Federal Income Tax Basis Financial Assets And Liabilities Measured At Fair Value Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Fair Value Of Notes Payable Fair Value Of Notes Receivable And Notes Payable Table Text Block Fair Value Of Notes Receivable And Notes Payable. Fair Value, by Balance Sheet Grouping [Table] Fair Value, by Balance Sheet Grouping [Table] Fixed Rate Notes Payable [Member] Fixed Rate Notes Payable [Member] Fixed Rate Notes Payable [Member] Carrying Value Estimated Fair Value Notes Payable, Fair Value Disclosure Equity Component Common share options exercised Conversions and redemptions of operating partnership units Stock Issued During Period, Shares, Conversion of Units Schedule IV - Mortgage Loans on Real Estate [Text Block] SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Text Block] nonconsolidated entity [Axis] nonconsolidated entity [Axis] nonconsolidated entity [Axis] nonconsolidated entity [Domain] nonconsolidated entity [Domain] [Domain] for nonconsolidated entity [Axis] Non-consolidated entity [Member] Non-consolidated entity [Member] Non-consolidated entity [Member] Maximum Investments by Formed Unconsolidated Joint Venture Maximum Investments by Formed Unconsolidated Joint Venture Maximum investment by formed unconsolidated joint venture including leverage of approximately 50% of the estimated value of the underlying real estate after to change in June 2019. Direct Costs of Leased and Rented Property or Equipment Direct Costs of Leased and Rented Property or Equipment