Equity [Abstract] Amount per share (in usd per share) Common Stock, Dividends, Per Share, Declared Investment Portfolios [Abstract] Investment Portfolios [Abstract] Schedule of Real Estate Properties [Table] Schedule of Real Estate Properties [Table] Real Estate Property Ownership [Axis] Real Estate Property Ownership [Axis] Real Estate Properties [Domain] Real Estate Properties [Domain] Land [Member] Land [Member] Lease Intangibles [Member] Real Estate Related Intangibles [Member] Real Estate Related Intangibles [Member] Real Estate Properties [Line Items] Real Estate Properties [Line Items] Real estate Real Estate Investment Property, Net Accumulated amortization of lease intangibles Real Estate Investment Property, Accumulated Depreciation Accounting Policies [Abstract] 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] 2013 Plan [Member] Two Thousand And Thirteen Stock Compensation Plan [Member] Two Thousand And Thirteen Stock Compensation Plan [Member] Award Type [Axis] Award Type [Axis] Award Type [Domain] Award Type [Domain] Restricted Stock Units [Member] Restricted Stock Units (RSUs) [Member] Statistical Measurement [Axis] Statistical Measurement [Axis] Statistical Measurement [Domain] Statistical Measurement [Domain] Minimum [Member] Minimum [Member] Maximum [Member] Maximum [Member] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Performance target rate Share-Based Compensation Arrangements By Share-Based Payment Award, Performance Target Rate Share-Based Compensation Arrangements By Share-Based Payment Award, Performance Target Rate Statement of Financial Position [Abstract] Non-recourse debt, secured by assets Non Recourse Secured Notes Payable Non Recourse Secured Notes Payable Preferred stock, par value (in usd per share) Preferred Stock, Par or Stated Value Per Share Preferred stock, shares authorized (in shares) Preferred Stock, Shares Authorized Preferred stock, shares issued (in shares) Preferred Stock, Shares Issued Preferred stock, shares outstanding (in shares) Preferred Stock, Shares Outstanding Common stock, par value (in usd per share) Common Stock, Par or Stated Value Per Share Common stock, shares authorized (in shares) Common Stock, Shares Authorized Common stock, shares issued (in shares) Common Stock, Shares, Issued Common stock, shares outstanding (in shares) Common Stock, Shares, Outstanding Basis of Presentation Basis of Accounting, Policy [Policy Text Block] Consolidation and Equity Method Investments Consolidation And Equity Method Investment In Affiliate [Policy Text Block] Consolidation and equity method investment in affiliate. Government and Commercial Receivables Receivable [Policy Text Block] Real Estate Real Estate, Policy [Policy Text Block] Investments Investment, Policy [Policy Text Block] Securitization of Financial Assets Securitizations [Policy Text Block] Securitizations Policy [Text Block] Cash and Cash Equivalents Cash and Cash Equivalents, Policy [Policy Text Block] Restricted Cash Cash and Cash Equivalents, Restricted Cash and Cash Equivalents, Policy [Policy Text Block] Convertible Notes Convertible Notes [Policy Text Block] Convertible notes. 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Scenario [Axis] Scenario [Axis] Scenario [Domain] Scenario [Domain] Forecast [Member] Forecast [Member] Debt Instrument [Line Items] Debt Instrument [Line Items] Principal Debt Instrument, Face Amount Principal, net of issuance costs Long-term Debt Interest rate Debt Instrument, Interest Rate, Stated Percentage Proceeds from issuance of debt Proceeds from Issuance of Debt Maximum unencumbered assets percentage of unsecured debt Debt Covenant, Maximum Unencumbered Assets Percentage Of Unsecured Debt Debt Covenant, Maximum Unencumbered Assets Percentage Of Unsecured Debt Redemption price, percentage Debt Instrument, Redemption Price, Percentage Offer share percentage Offer share percentage Offer share percentage Total interest expense Interest Expense Dividends declared per share (in usd per share) Conversion rate of shares for each $1,000 principal amount of convertible notes Debt Instrument, Convertible, Conversion Ratio Conversion price per share (in usd per share) Debt Instrument, Convertible, Conversion Price Adjustment for dividends declared (in usd per share) Adjustment For Dividends Declared Minimum Adjustment for dividends declared minimum. Number of segment reported Number of Reportable Segments Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Debt Securities [Member] Debt Securities [Member] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Balance, beginning of period Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value Purchases of investments Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases Payments on investments Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements Sale of investments Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales Realized gains on investments recorded in earnings Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings Unrealized gains (losses) on investments recorded in AOCI Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) Balance, end of period Financing Receivable, Credit Quality Indicator [Table] Financing Receivable, Credit Quality Indicator [Table] Class of Financing Receivable [Axis] Class of Financing Receivable [Axis] Class of Financing Receivable [Domain] Class of Financing Receivable [Domain] U.S. Federal Government [Member] Us Federal Government [Member] Us Federal Government [Member] State, Local, Institutions [Member] US States and Political Subdivisions Debt Securities [Member] Residential Solar Loan [Member] Residential Solar Loan [Member] Residential solar loan. Internal Credit Assessment [Axis] Internal Credit Assessment [Axis] Internal Credit Assessment [Domain] Internal Credit Assessment [Domain] Investment Grade by Independent Rating Agency [Member] Investment Grade By Independent Rating Agency [Member] Investment Grade By Independent Rating Agency [Member] Related Party [Axis] Related Party [Axis] Related Party [Domain] Related Party [Domain] Special Purpose Subsidiaries [Member] Equity Method Investee [Member] External Credit Rating by Grouping [Axis] External Credit Rating by Grouping [Axis] External Credit Rating by Grouping [Domain] External Credit Rating by Grouping [Domain] Commercial Non-Investment Grade [Member] External Credit Rating, Non Investment Grade [Member] Financing Receivable, Credit Quality Indicator [Line Items] Financing Receivable, Credit Quality Indicator [Line Items] Total financing receivable Loans and Leases Receivable, Net Amount Loans receivable Financing Receivable, after Allowance for Credit Loss Noncontrolling equity investments Noncontrolling Interest in Joint Ventures Increase in finance receivables Increase (Decrease) in Finance Receivables Financing receivables on non accrual status Financing Receivable, Nonaccrual Number of transactions Number of Transactions Number of Transactions Financial receivable outstanding Finance Receivable Outstanding Average Remaining Balance Finance Receivable Outstanding Average Remaining Balance Total aggregate remaining balance Finance Receivable Aggregate Remaining Amount Finance Receivable Aggregate Remaining Amount Earnings Per Share [Abstract] Earnings per Share of Common Stock Earnings Per Share [Text Block] Summary of Fair Value and Carrying Value of Financial Assets and Liabilities Fair Value, by Balance Sheet Grouping [Table Text Block] Schedule of Reconciliation of Level 3 Investments Securities Schedule of Available-for-sale Securities Reconciliation [Table Text Block] Schedule of Investments in Unrealized Loss Position Debt Securities, Available-for-sale, Unrealized Loss Position, Fair Value [Table Text Block] Schedule of Cash Deposits Subject to Credit Risk Fair Value, Concentration of Risk [Table Text Block] Deferred funding obligations Contractual Obligation Amortized cost of investments Debt Securities, Available-for-sale, Amortized Cost Statement of Comprehensive Income [Abstract] Unrealized gain (loss) on interest rate swaps, tax benefit (provision) Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, Tax Unrealized gain (loss) on available-for-sale securities, benefit (provision) Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, Tax Buckeye Wind Energy Class B Holdings, LLC [Member] Buckeye Wind Energy Class B Holdings LLC [Member] Buckeye Wind Energy Class B Holdings LLC [Member] Other Investments [Member] Other Equity Method Investments [Member] Other Equity Method Investments [Member] Balance Sheet Equity Method Investment, Summarized Financial Information, Liabilities and Equity [Abstract] Current assets Equity Method Investment, Summarized Financial Information, Current Assets Total assets Equity Method Investment, Summarized Financial Information, Assets Current liabilities Equity Method Investment, Summarized Financial Information, Current Liabilities Total liabilities Equity Method Investment, Summarized Financial Information, Liabilities Members’ equity Equity Method Investment Summarized Financial Information, Equity Income Statement Equity Method Investment, Summarized Financial Information, Income Statement [Abstract] Revenue Equity Method Investment, Summarized Financial Information, Revenue Income from continuing operations Equity Method Investment, Summarized Financial Information, Income (Loss) from Continuing Operations Net income Equity Method Investment, Summarized Financial Information, Net Income (Loss) 2007 Vento I, LLC [Member] 2007 Vento I, LLC [Member] 2007 Vento I, LLC [Member] Vivint Solar Asset 1 Class B, LLC [Member] Vivint Solar Asset 1 Class B, LLC [Member] Vivint Solar Asset 1 Class B, LLC [Member] Northern Frontier Wind, LLC [Member] Northern Frontier Wind, LLC [Member] Northern Frontier Wind, LLC [Member] 3D Engie, LLC [Member] 3D Engie, LLC [Member] 3D Engie, LLC [Member] Invenergy Gunsight Mountain Holdings, LLC [Member] Invenergy Gunsight Mountain Holdings LLC [Member] Invenergy Gunsight Mountain Holdings LLC. Helix Fund, LLC [Member] Helix Fund, LLC [Member] Helix Fund, LLC [Member] Other Transactions [Member] Carrying Value Other Non-recourse Debt [Member] Other Non-Recourse Debt [Member] Other Non-Recourse Debt [Member] HASI Sustainable Yield Bond 2013-1 [Member] Hannon Armstrong Sustainable Infrastructure Capital Sustainable Yield Bond Two Thousand Thirteen One [Member] Hannon armstrong sustainable infrastructure capital sustainable yield bond two thousand thirteen one. HASI Sustainable Yield Bond 2015-1A [Member] Hannon Armstrong Sustainable Infrastructure Capital Sustainable Yield Bond Two Thousand Fifteen One A [Member] Hannon armstrong sustainable infrastructure capital sustainable yield bond two thousand fifteen one A. HASI Sustainable Yield Bond 2015-1B Note [Member] Hannon Armstrong Sustainable Infrastructure Capital Sustainable Yield Bond Two Thousand Fifteen One B [Member] Hannon armstrong sustainable infrastructure capital sustainable yield bond two thousand fifteen one B. 2017 Credit Agreement [Member] Two Thousand Seventeen Credit Agreement [Member] 2017 Credit Agreement. HASI SYB Trust 2016-2 [Member] Hannon Armstrong Sustainable Infrastructure Capital Sustainable Yield Bond Trust Two Thousand Sixteen Two [Member] Hannon Armstrong sustainable infrastructure capital sustainable yield bond trust two thousand sixteen two [Member] 2017 Master Repurchase Agreement [Member] Two Thousand Seventeen Master Repurchase Agreement [Member] 2017 master repurchase agreement. HASI ECON 101 Trust [Member] HASI ECON 101 Trust [Member] HASI ECON 101 Trust. HASI SYB Trust 2017-1 [Member] HASI SYB Trust 2017-1 [Member] HASI SYB Trust 2017-1 [Member] Outstanding Balance Long-term Debt, Gross Other non-recourse debt Other Non Recourse Debt Other Non Recourse Debt Debt issuance costs Debt Issuance Costs, Net Total non-recourse debt Interest Rate Anticipated Balance at Maturity Debt Principal Amount Due Upon Maturity Debt Principal Amount Due Upon Maturity Carrying Value of Assets Pledged, Receivables Pledged Assets, Not Separately Reported, Finance Receivables Carrying Value of Assets Pledged, Other Pledged Assets, Not Separately Reported, Other Non-recourse Debt [Member] Non Recourse Notes [Member] Non recourse notes. Future minimum maturities Long-term Debt, Fiscal Year Maturity [Abstract] October 1, 2019 to December 31, 2019 Long-term Debt, Maturities, Repayments of Principal, Remainder of Fiscal Year 2020 Long-term Debt, Maturities, Repayments of Principal in Year Two 2021 Long-term Debt, Maturities, Repayments of Principal in Year Three 2022 Long-term Debt, Maturities, Repayments of Principal in Year Four 2023 Long-term Debt, Maturities, Repayments of Principal in Year Five 2024 Long Term Debt Maturities Repayments Of Principal In Year Six Long term debt maturities repayments of principal in year six. Thereafter Long Term Debt Maturities Repayments Of Principal After Year Six Long term debt maturities repayments of principal after year six. Total minimum maturities Long Term Debt Minimum Maturities Long term debt minimum maturities. Deferred financing costs, net Transfers and Servicing [Abstract] Schedule of Fair Value Assumption, Date of Securitization or Asset-backed Financing Arrangement, Transferor's Continuing Involvement, Servicing Assets or Liabilities [Table] Schedule of Fair Value Assumption, Date of Securitization or Asset-backed Financing Arrangement, Transferor's Continuing Involvement, Servicing Assets or Liabilities [Table] Securitization Trust [Member] Securitization Trust [Member] Securitization Trust [Member] Financial Instrument [Axis] Financial Instrument [Axis] Financial Instruments [Domain] Financial Instruments [Domain] Residual Assets [Member] Residual Assets [Member] Residual assets. Fair Value Assumption, Date of Securitization or Asset-backed Financing Arrangement, Transferor's Continuing Involvement, Servicing Assets or Liabilities [Line Items] Fair Value Assumption, Date of Securitization or Asset-backed Financing Arrangement, Transferor's Continuing Involvement, Servicing Assets or Liabilities [Line Items] Gains on securitizations Gain (Loss) on Securitization of Financial Assets Cost of financial assets securitized Payments To Acquire Accounts Receivable Securitization Payments to Acquire Accounts Receivable Securitization Proceeds from securitizations Proceeds from Accounts Receivable Securitization Residual and servicing assets included in other assets Retained Interest, Fair Value Disclosure Cash received from residual and servicing assets Cash Received From Residual And Servicing Assets Cash received from residual and servicing assets. Line of Credit Facility [Table] Line of Credit Facility [Table] Credit Facility [Axis] Credit Facility [Axis] Credit Facility [Domain] Credit Facility [Domain] Senior Secured Revolving Credit Facility [Member] Revolving Credit Facility [Member] Rep-Based Facility [Member] Representation-Based Facility [Member] Representation-Based Facility [Member] Approval-Based Facility [Member] Approval-Based Facility [Member] Approval-Based Facility [Member] Line of Credit Facility [Line Items] Line of Credit Facility [Line Items] Outstanding balance Long-term Line of Credit Value of collateral pledged to credit facility Pledged Assets Separately Reported, Finance Receivables Pledged as Collateral, at Fair Value Weighted average short-term borrowing rate Short-term Debt, Weighted Average Interest Rate, at Point in Time Income (loss) from equity method investments Income (Loss) from Equity Method Investments Income Tax Disclosure [Abstract] Income Tax Income Tax Disclosure [Text Block] Schedule of Outstanding Non-Recourse Asset-Backed Debt and Bank Loans Schedule of Financial Instruments Owned and Pledged as Collateral [Table Text Block] Schedule of Minimum Maturities of Debt Schedule of Maturities of Long-term Debt [Table Text Block] Summary of Components of Notes Convertible Debt [Table Text Block] Estimated Fair Value Debt Securities, Available-For-Sale, Continuous Unrealized Loss Position, Fair Value [Abstract] Debt Securities, Available-For-Sale, Continuous Unrealized Loss Position, Fair Value [Abstract] Securities with a loss shorter than 12 months Debt Securities, Available-for-sale, Unrealized Loss Position Securities with a loss shorter than 12 months Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss Unrealized Losses Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract] Securities with a loss longer than 12 months Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer Securities with a loss longer than 12 months Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss Statement [Table] Statement [Table] Government Receivables [Member] Government Receivables [Member] Government Receivables [Member] Commercial Receivables [Member] Commercial Receivables [Member] Commercial Receivables [Member] Statement [Line Items] Statement [Line Items] Assets Assets [Abstract] Receivables Real estate Real Estate Investments, Net Investments Debt Securities, Available-for-sale Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Other assets Other Assets Total Assets Assets Liabilities and Stockholders’ Equity Liabilities and Equity [Abstract] Liabilities: Liabilities [Abstract] Accounts payable, accrued expenses and other Accounts Payable and Accrued Liabilities Credit facilities Non-recourse debt (secured by assets of $887 million and $1,105 million, respectively) Non-Recourse Debt Senior unsecured notes Unsecured Debt Convertible notes Convertible Notes Payable Total Liabilities Liabilities Stockholders’ Equity: Stockholders' Equity Attributable to Parent [Abstract] Preferred stock, par value $0.01 per share, 50,000,000 shares authorized, no shares issued and outstanding Preferred Stock, Value, Issued Common stock, par value $0.01 per share, 450,000,000 shares authorized, 64,924,800 and 60,510,086 shares issued and outstanding, respectively Common Stock, Value, Issued Additional paid in capital Additional Paid in Capital, Common Stock Accumulated deficit Retained Earnings (Accumulated Deficit) Accumulated other comprehensive income (loss) Accumulated Other Comprehensive Income (Loss), Net of Tax Non-controlling interest Stockholders' Equity Attributable to Noncontrolling Interest Total Stockholders’ Equity Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Total Liabilities and Stockholders’ Equity Liabilities and Equity Income tax expense (benefit) Income Tax Expense (Benefit) Federal benefit (as a percent) Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent Schedule of Computation of Basic and Diluted Earnings Per Common Share of Common Stock Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Income Statement [Abstract] Revenue Revenues [Abstract] Interest income Interest Income, Operating Rental income Operating Lease, Lease Income Gain on sale of receivables and investments Loans and Leases Receivable, Gain (Loss) on Sales, Net Fee income Investment Banking, Advisory, Brokerage, and Underwriting Fees and Commissions Total revenue Revenues Expenses Operating And Non Operating Expenses [Abstract] Operating And Non Operating Expenses [Abstract] Interest expense Provision for loss on receivables Provision for Loan and Lease Losses Compensation and benefits Labor and Related Expense General and administrative General and Administrative Expense Total expenses Operating And Non Operating Expenses Sum of operating and non-operating costs including investment interest expense, compensation and benefits and general and administrative. Income before equity method investments Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest Income (loss) before income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Income tax (expense) benefit Net income (loss) Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Net income (loss) attributable to non-controlling interest holders Net Income (Loss) Attributable to Noncontrolling Interest Net income (loss) attributable to controlling stockholders Net Income (Loss) Attributable to Parent Basic earnings (loss) per common share (in usd per share) Earnings Per Share, Basic Diluted earnings (loss) per common share (in usd per share) Earnings Per Share, Diluted Weighted average common shares outstanding — basic (in shares) Weighted Average Number of Shares Outstanding, Basic Weighted average common shares outstanding — diluted (in shares) Weighted Average Number of Shares Outstanding, Diluted Restricted Stock and Restricted Stock Units [Member] Restricted Stock And Restricted Stock Units [Member] Restricted stock and restricted stock units. Number of shares awarded (in shares) Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures Equity-based compensation expense Employee Benefits and Share-based Compensation Unrecognized compensation expense Share-based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount Weighted-average term in which unrecognized compensation expense is expected to be recognized Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition Noncontrolling Interest [Abstract] Non-Controlling Interest Noncontrolling Interest Disclosure [Text Block] Fair Value Measurements Fair Value Measurement and Measurement Inputs, Recurring and Nonrecurring [Text Block] Our Portfolio Portfolio [Text Block] Disclosure for portfolio, including financing receivables, investments available for sale, real estate, and equity method investments. Future Amortization Expense Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] From October 1, 2019 to December 31, 2019 Finite-Lived Intangible Assets, Amortization Expense, Remainder of Fiscal Year 2020 Finite-Lived Intangible Assets, Amortization Expense, Year Two 2021 Finite-Lived Intangible Assets, Amortization Expense, Year Three 2022 Finite-Lived Intangible Assets, Amortization Expense, Year Four 2023 Finite-Lived Intangible Assets, Amortization Expense, Year Five 2024 Finite Lived Intangible Assets Amortization Expense Year Six Finite Lived Intangible Assets Amortization Expense Year Six Thereafter Finite Lived Intangible Assets Amortization Expense After Year Six Finite Lived Intangible Assets Amortization Expense After Year Six Total Finite-Lived Intangible Assets, Net Minimum Rental Income Payments Lessor, Operating Lease, Payments, Fiscal Year Maturity [Abstract] From October 1, 2019 to December 31, 2019 Lessor, Operating Lease, Payments to be Received, Remainder of Fiscal Year 2020 Lessor, Operating Lease, Payments to be Received, Two Years 2021 Lessor, Operating Lease, Payments to be Received, Three Years 2022 Lessor, Operating Lease, Payments to be Received, Four Years 2023 Lessor, Operating Lease, Payments to be Received, Five Years 2024 Lessor, Operating Lease, Payments To Be Received, Six Years Lessor, Operating Lease, Payments To Be Received, Six Years Thereafter Lessor, Operating Lease, Payments To Be Received, After Six Years Lessor, Operating Lease, Payments To Be Received, After Six Years Total Lessor, Operating Lease, Payments to be Received Restricted Shares of Common Stock [Member] Restricted Stock [Member] LTIP Time-Based Vesting Units [Member] OP LTIP Time-Based Vesting Units [Member] OP LTIP Time-Based Vesting Units [Member] LTIP Market-Based Vesting Units [Member] OP LTIP Market-Based Vesting Units [Member] OP LTIP Market-Based Vesting Units [Member] Award vesting percentage Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage Shares Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Beginning Balance (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number Granted (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period Vested (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period Forfeited (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period Ending Balance (in shares) Weighted Average Grant Date Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] Beginning Balance (in usd per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value Granted (in usd per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Vested (in usd per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value Forfeited (in usd per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value Ending Balance (in usd per share) Value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value [Abstract] Beginning Balance Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Fair Value One Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Fair Value One Granted Share Based Compensation Arrangement By Share Based Payment Award Equity Instrument Other Than Options Grants In Period Fair Value Share based compensation arrangement by share based payment award equity instrument other than options grants in period fair value. Vested Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Fair Value Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Fair Value Forfeited Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Forfeitures Fair Value Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Forfeitures Fair Value Ending Balance Cover page. Document Type Document Type Document Quarterly Report Document Quarterly Report Document Period End Date Document Period End Date Document Transition Report Document Transition Report Entity File Number Entity File Number Entity Registrant Name Entity Registrant Name Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Entity Tax Identification Number Entity Tax Identification Number Entity Address, Address Line One Entity Address, Address Line One Entity Address, Address Line Two Entity Address, Address Line Two 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 City Area Code City Area Code Local Phone Number Local Phone Number Entity Current Reporting Status Entity Current Reporting Status Entity Interactive Data Current Entity Interactive Data Current Entity Filer Category Entity Filer Category Entity Small Business Entity Small Business Entity Emerging Growth Company Entity Emerging Growth Company Entity Shell Company Entity Shell Company Title of 12(b) Security Title of 12(b) Security Trading Symbol Trading Symbol Security Exchange Name Security Exchange Name Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Amendment Flag Amendment Flag Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Entity Central Index Key Entity Central Index Key Current Fiscal Year End Date Current Fiscal Year End Date Financing receivable, past due period Threshold Period Past Due For Delinquent Or Nonaccrual Of Financing Receivable Threshold period past due for delinquent or nonaccrual of financing receivable. Securitization of Financial Assets Securitization Of Receivables [Text Block] Securitization Of Receivables [Text Block] Government [Member] US Treasury and Government [Member] Subtotal, Debt and Real Estate [Member] Debt And Real Estate Portfolio Rated Investment Grade Excluding Equity Method Investments [Member] Debt And Real Estate Portfolio Rated Investment Grade Excluding Equity Method Investments [Member] Equity Method Investments [Member] Equity Method Investments [Member] Commercial Investment Grade [Member] External Credit Rating, Investment Grade [Member] Renewable Energy Projects [Member] Renewable Energy Projects [Member] Renewable energy projects. Concentration Risk Type [Axis] Concentration Risk Type [Axis] Concentration Risk Type [Domain] Concentration Risk Type [Domain] Credit Concentration Risk [Member] Credit Concentration Risk [Member] Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Domain] Concentration Risk Benchmark [Domain] Debt and Real Estate Portfolio [Member] Portfolio [Member] Portfolio [Member] Receivables Loans and Leases Receivable, Gross Real estate Real Estate Investments And Intangible Leases Assets Real Estate Investments And Intangible Leases Assets Total Long-term Investments and Receivables, Net % of Debt and real estate portfolio Concentration Risk, Percentage Average remaining balance Cash deposits Restricted cash deposits (included in other assets) Restricted Cash and Cash Equivalents Total cash deposits Cash and Cash Equivalents, Fair Value Disclosure Amount of cash deposits in excess of amounts federally insured Cash, Uninsured Amount Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Statement of Stockholders' Equity [Abstract] Equity Components [Axis] Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Common Stock [Member] Common Stock [Member] Additional Paid-in Capital [Member] Additional Paid-in Capital [Member] Accumulated Deficit [Member] Retained Earnings [Member] Accumulated Other Comprehensive Income (Loss) [Member] AOCI Attributable to Parent [Member] Non-Controlling Interest [Member] Noncontrolling Interest [Member] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Beginning Balance (in shares) Shares, Outstanding Beginning Balance Net income (loss) Unrealized gain (loss) on available-for-sale securities Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, after Tax Unrealized gain (loss) on interest rate swaps Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax Issued shares of common stock (in shares) Issued shares of common stock Stock Issued During Period, Value, New Issues Equity-based compensation Shares Granted, Value, Share-based Payment Arrangement, after Forfeiture Issuance (repurchase) of vested equity-based compensation shares (in shares) Vested Equity Based Compensation Shares Issued And Other Adjustments Vested Equity Based Compensation Shares Issued And Other Adjustments Issuance (repurchase) of vested equity-based compensation shares Vested Equity Based Compensation Shares Issued And Other Adjustments Amount Vested Equity Based Compensation Shares Issued And Other Adjustments Amount Redemption of OP Units (in shares) Stock Redeemed or Called During Period, Shares Redemption of OP Units Stock Redeemed or Called During Period, Value Dividends and distributions Dividends, Common Stock, Cash Ending Balance (in shares) Ending Balance Schedule of Securitization or Asset-backed Financing Arrangements, Financial Asset for which Transfer is Accounted as Sale [Table] Schedule of Securitization or Asset-backed Financing Arrangements, Financial Asset for which Transfer is Accounted as Sale [Table] Measurement Input, Discount Rate [Member] Measurement Input, Discount Rate [Member] Asset-backed Securities, Securitized Loans and Receivables [Member] Asset-backed Securities, Securitized Loans and Receivables [Member] Financial Asset, Period Past Due [Axis] Financial Asset, Period Past Due [Axis] Financial Asset, Period Past Due [Domain] Financial Asset, Period Past Due [Domain] Greater than 90 Days Past Due [Member] Financial Asset, Equal to or Greater than 90 Days Past Due [Member] Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items] Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items] Annual servicing fees Services Fee Annual Rate Services Fee Annual Rate Discount rates to determine fair market value of underlying assets Servicing Asset, Measurement Input Managed assets Managed Assets Managed Assets Managed receivables Receivables Serviced Receivables Serviced Securitization credit losses Net Credit Loss on Loans Managed or Securitized or Asset-backed Financing Arrangement Payment from debtors to securitization trust Accounts Receivable from Securitization Unrealized gain (loss) on available-for-sale securities, net of tax benefit (provision) of $0.1 million and $0.2 million in each of the three and nine month periods ended 2019, and $0.0 million in each of the three and nine month periods ended 2018 Unrealized gain (loss) on interest rate swaps, net of tax benefit (provision) of $0.0 million in each of the three and nine month periods ended 2019 and $(2.0) million in each of the three and nine months period ended 2018, respectively Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax Comprehensive income (loss) Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Less: Comprehensive income (loss) attributable to non-controlling interest holders Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest Comprehensive income (loss) attributable to controlling stockholders Comprehensive Income (Loss), Net of Tax, Attributable to Parent Fair Value, Recurring and Nonrecurring [Table] Fair Value, Recurring and Nonrecurring [Table] Measurement Basis [Axis] Measurement Basis [Axis] Fair Value Measurement [Domain] Fair Value Measurement [Domain] Portion at Fair Value Measurement [Member] Portion at Fair Value Measurement [Member] Fair Value [Member] Estimate of Fair Value Measurement [Member] Carrying Value [Member] Reported Value Measurement [Member] Level 2 [Member] Fair Value, Inputs, Level 2 [Member] Investments [Member] Investments [Member] Securitization Residual Assets [Member] Securitization Residual Assets [Member] Securitization residual assets. Liability Class [Axis] Liability Class [Axis] Fair Value by Liability Class [Domain] Fair Value by Liability Class [Domain] Credit Facilities [Member] Credit Facility [Member] Credit Facility [Member] Senior unsecured notes [Member] Senior unsecured notes [Member] Senior unsecured notes [Member] Convertible Notes [Member] Convertible Debt [Member] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Assets Assets, Fair Value Disclosure Liabilities Financial and Nonfinancial Liabilities, Fair Value Disclosure Receivables Accounts Receivable Additional Disclosures [Abstract] Maturities by period Financing Receivables, Fiscal Year Maturity [Abstract] Financing Receivables, Fiscal Year Maturity [Abstract] Total Financing Receivables Financing Receivables Less than 1 year Financing Receivable Due Less Than One Year Financing Receivable Due Less Than One Year 1-5 years Financing Receivable Due One To Five Years Financing Receivable Due One To Five Years 5-10 years Financing Receivable Due Five To Ten Years Financing Receivable Due Five To Ten Years More than 10 years Financing Receivable Due More Than Ten Years Financing Receivable Due More Than Ten Years Weighted average yield by period Financing Receivables, Weighted Average Yield, Fiscal Year Maturity [Abstract] Financing Receivables, Weighted Average Yield, Fiscal Year Maturity [Abstract] Total Financing Receivables Weighted Average Yield Financing receivables weighted average yield. Less than 1 year Financing Receivables Weighted Average Yield Due Less Than One Year Financing receivables weighted average yield due less than one year. 1-5 years Financing Receivables Weighted Average Yield Due One To Five Years Financing receivables weighted average yield due one to five years. 5-10 years Financing Receivables Weighted Average Yield Due Five To Ten Years Financing receivables weighted average yield due five to ten years. More than 10 years Financing Receivables Weighted Average Yield Due More Than Ten Years Financing receivables weighted average yield due more than ten years. Investments Investments [Abstract] Maturities by period Investments, Fiscal Year Maturity [Abstract] Investments, Fiscal Year Maturity [Abstract] Total Investments Less than 1 year Investments Due Less Than One Year Investments Due Less Than One Year 1-5 years Investments Due One To Five Years Investments Due One To Five Years 5-10 years Investments Due Five To Ten Years Investments Due Five To Ten Years More than 10 years Investments Due More Than Ten Years Investments Due More Than Ten Years Weighted average yield by period Investments, Weighted Average Yield, Fiscal Year Maturity [Abstract] Investments, Weighted Average Yield, Fiscal Year Maturity [Abstract] Total Investments Weighted Average Yield Investments weighted average yield. Less than 1 year Investments Weighted Average Yield Due Less Than One Year Investments weighted average yield due less than one year. 1-5 years Investments Weighted Average Yield Due One To Five Years Investments Weighted Average Yield Due One To Five Years 5-10 years Investments Weighted Average Yield Due Five To Ten Years Investments Weighted Average Yield Due Five To Ten Years More than 10 years Investments Weighted Average Yield Due More Than Ten Years Investments weighted average yield due more than ten years. Summary of Certain Transactions with Securitization Trusts Schedule Of Cash Flows Received From And Paid To Loan Securitization Trusts [Text Block] Schedule Of Cash Flows Received From And Paid To Loan Securitization Trusts [Text Block] Variable Rate [Axis] Variable Rate [Axis] Variable Rate [Domain] Variable Rate [Domain] LIBOR [Member] London Interbank Offered Rate (LIBOR) [Member] Federal Funds Rate [Member] Fed Funds Effective Rate Overnight Index Swap Rate [Member] Investment Type [Axis] Investment Type [Axis] Investments [Domain] Investments [Domain] Institutional [Member] Institutional [Member] Institutional [Member] Certain Approved Existing Financing [Member] Certain Approved Existing Financing [Member] Certain Approved Existing Financing [Member] Others as Prescribed by Administrative Agent [Member] Others As Prescribed By Administrative Agent [Member] Others As Prescribed By Administrative Agent [Member] Credit Default Option [Member] Credit Default Option [Member] Number of revolving credit facilities Debt Instrument, Number Of Instruments Debt Instrument, Number Of Instruments Principal amount Line of Credit Facility, Maximum Borrowing Capacity Basis spread on variable rate (as a percent) Debt Instrument, Basis Spread on Variable Rate Fixed interest rate Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate Applicable valuation percentages Valuation Allowance Percentage Valuation Allowance Percentage Unamortized issuance costs Debt Issuance Costs, Line of Credit Arrangements, Gross Availability fee percentage Line Of Credit Facility, Availability Fee Percentage Line Of Credit Facility, Availability Fee Percentage Default underlying financings (percent) Default Underlying Financing Default underlying financing. Summary of Dividends Declared by Board of Directors Dividends Declared [Table Text Block] Schedule of Common Stock Public Offerings and ATM Public Offering Of Common Stock [Table Text Block] Public offering of common stock table. Summary of Unvested Shares Schedule of Nonvested Share Activity [Table Text Block] Schedule of Additional Detail on Credit Facility Schedule of Line of Credit Facilities [Table Text Block] Statement of Cash Flows [Abstract] Cash flows from operating activities Net Cash Provided by (Used in) Operating Activities, Continuing Operations [Abstract] Adjustments to reconcile net income (loss) to net cash provided by operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Depreciation and amortization Depreciation, Depletion and Amortization Amortization of deferred financing costs Amortization of Debt Issuance Costs Equity-based compensation Share-based Payment Arrangement, Noncash Expense Equity method investments Income (Loss) from Equity Method Investments, Net of Dividends or Distributions Non-cash gain on securitization Gain on sale of receivables and investments Gain (Loss) On Sale of Financing Receivables and Investments Gain (Loss) On Sale of Financing Receivables and Investments Changes in receivables held-for-sale Increase (Decrease) in Assets Held-for-sale Changes in accounts payable and accrued expenses Increase (Decrease) in Accounts Payable and Accrued Liabilities Other Increase (Decrease) in Other Operating Assets Net cash provided by (used in) operating activities Net Cash Provided by (Used in) Operating Activities Cash flows from investing activities Net Cash Provided by (Used in) Investing Activities [Abstract] Equity method investments Payments to Acquire Equity Method Investments Equity method investment distributions received Proceeds from Equity Method Investment, Distribution, Return of Capital Proceeds from sales of equity method investments Proceeds from Sale of Equity Method Investments Purchases of and investments in receivables Payments to Acquire Finance Receivables Principal collections from receivables Proceeds from Collection of Finance Receivables Proceeds from sales of receivables Proceeds from Sale of Finance Receivables Purchases of real estate Payments to Acquire Real Estate Purchases of investments Payments to Acquire Debt Securities, Available-for-sale Principal collections from investments Proceeds from Maturities, Prepayments and Calls of Debt Securities, Available-for-sale Proceeds from sales of investments and securitization assets Proceeds From Sale Of Investments And Securitization Of Assets Proceeds From Sale Of Investments And Securitization Of Assets Funding of escrow accounts Payments For Funding Of Escrow Accounts Payments for funding of escrow accounts. Withdrawal from escrow accounts Proceeds From Escrow Accounts Proceeds from escrow accounts. Other Payments for (Proceeds from) Other Investing Activities Net cash provided by (used in) investing activities Net Cash Provided by (Used in) Investing Activities Cash flows from financing activities Net Cash Provided by (Used in) Financing Activities [Abstract] Proceeds from credit facilities Proceeds from Lines of Credit Principal payments on credit facilities Repayments of Lines of Credit Proceeds from issuance of non-recourse debt Proceeds from Issuance of Secured Debt Principal payments on non-recourse debt Repayments of Secured Debt Proceeds from issuance of senior unsecured notes Proceeds from Issuance of Unsecured Debt Payments on deferred funding obligations Payments on Deferred Funding Obligations Payments on Deferred Funding Obligations Net proceeds of common stock issuances Payments of dividends and distributions Payments of Dividends Other Proceeds from (Payments for) Other Financing Activities Net cash provided by (used in) financing activities Net Cash Provided by (Used in) Financing Activities 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 at beginning of period Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Cash, cash equivalents, and restricted cash at end of period Interest paid Interest Paid, Including Capitalized Interest, Operating and Investing Activities Non-cash changes in deferred funding obligations and non-recourse debt (financing activity) Non Cash Changes In Deferred Funding Obligations Non cash changes in deferred funding obligations. Non-cash changes in receivables and investments (investing activity) Non Cash Changes In Financing Receivables And Investments Non-cash changes in financing receivables and investments. Non-cash changes in residual assets (investing activity) Gain Loss On Non Cash Securitization Of Residual Assets Gain loss on non cash securitization of residual assets. Non-cash changes in escrow accounts (investing activity) Noncash Changes In Escrow Accounts, Investing Activities Noncash Changes In Escrow Accounts, Investing Activities Analysis of Portfolio by Type of Obligor and Credit Quality Financing Receivable Credit Quality Indicators [Table Text Block] Schedule of Equity Method Investments Equity Method Investments [Table Text Block] Summary of Anticipated Maturity Dates of Financing Receivables and Investments and Weighted Average Yield Investments Classified by Contractual Maturity Date [Table Text Block] Components of Real Estate Portfolio Schedule of Real Estate Properties [Table Text Block] Schedule of Minimum Rental Income Payments Lessor, Operating Lease, Payments to be Received, Maturity [Table Text Block] Schedule of Future Amortization Expense of Intangible Assets Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] Financing receivables, investments, real estate and equity method investments Accrued interest Debt Instrument Accrued Interest Debt instrument accrued interest. Unamortized premium Debt Instrument, Unamortized Premium Less: Unamortized financing costs Unamortized Debt Issuance Expense Carrying value of convertible notes Noncontrolling Interest [Table] Noncontrolling Interest [Table] Noncontrolling Interest [Line Items] Noncontrolling Interest [Line Items] Outstanding OP units held by outside limited partners (as a percent) Operating Partnership Units Not Owned By Company Operating partnership units not owned by company. Exchange of operating partnership units to common stock (in shares) Exchange Of Operating Partnership Units To Common Stock Exchange of operating partnership units to common stock. Numerator: Income Loss From Operation Before Extraordinary Items Per Basic And Diluted Share [Abstract] Income loss from operation before extraordinary items per basic and diluted share. Net income (loss) attributable to controlling stockholders and participating securities Less: Dividends on participating securities Dividend Paid On Participating Securities Dividend Paid On Participating Securities Undistributed earnings attributable to participating securities Undistributed Earnings To Participating Securities Undistributed Earnings To Participating Securities Net income (loss) attributable to controlling stockholders Net Income Loss Available To Common Stockholders Basic And Diluted Net Income Loss Available To Common Stockholders Basic And Diluted Denominator: Earnings Per Share, Basic and Diluted, Other Disclosures [Abstract] Weighted-average number of common shares — basic (in usd per share) Weighted-average number of common shares — diluted (in usd per share) Basic earnings per common share (in usd per share) Diluted earnings per common share (in usd per share) Other Information: Earnings Per Unit [Abstract] Weighted-average number of OP units (in shares) Weighted Average Number of Operating Partnership Units Weighted average number of operating partnership units. Unvested restricted common stock outstanding at period end (i.e. participating securities) (in shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Credit Facilities Credit Facility Disclosure [Text Block] Credit Facility Disclosure [Text Block] Financing Receivable, Past Due [Table] Financing Receivable, Past Due [Table] Financing Receivable Portfolio Segment [Axis] Financing Receivable Portfolio Segment [Axis] Financing Receivable Portfolio Segment [Domain] Financing Receivable Portfolio Segment [Domain] Commercial [Member] Commercial Portfolio Segment [Member] Non-Investment Grade [Member] Property, Plant and Equipment, Type [Axis] Property, Plant and Equipment, Type [Axis] Property, Plant and Equipment, Type [Domain] Property, Plant and Equipment, Type [Domain] Financing Receivable, Past Due [Line Items] Financing Receivable, Past Due [Line Items] Number of receivables Number Of Financing Receivable Contracts Number Of Financing Receivable Contracts Number of projects that became past due Number Of Past Due Projects Number Of Past Due Projects Proceeds from lease payments Proceeds from Collection of Lease Receivables Allowance for credit losses Financing Receivable, Allowance for Credit Loss Loan modifications that qualify as troubled debt restructurings Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down Organization, Consolidation and Presentation of Financial Statements [Abstract] The Company Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Summary of Significant Accounting Policies Significant Accounting Policies [Text Block]