Accounting Policies [Abstract] Schedule of Accounts, Notes, Loans and Financing Receivable [Table] Schedule of Accounts, Notes, Loans and Financing Receivable [Table] Range [Axis] Range [Axis] Range [Domain] Range [Domain] Minimum [Member] Minimum [Member] Maximum [Member] Maximum [Member] Other Commitments [Axis] Other Commitments [Axis] Other Commitments [Domain] Other Commitments [Domain] Office Lease [Member] Office Lease [Member] Office Lease [Member] Summary of Significant Accounting Policies Accounts, Notes, Loans and Financing Receivable [Line Items] Total capitalized internal costs Capitalized Costs Oil and Gas Producing Activities Capitalized costs oil and gas producing activities, total. Proved oil and gas properties Capitalized Costs, Proved Properties Unproved oil and gas properties Capitalized Costs, Unproved Properties Furniture, fixtures, and other equipment Furniture and Fixtures, Gross Less - Accumulated depreciation, depletion, and amortization Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Property and Equipment, Net Property, Plant and Equipment, Net Estimated useful lives of property Property, Plant and Equipment, Useful Life Discount rate for estimated future net revenues from proved properties Discount Rate for Estimated Future Net Revenues from Proved Properties Discount rate for estimated future net revenues from proved properties. Write-down of oil and gas properties Impairment of Oil and Gas Properties Allowance for doubtful accounts receivable, current Allowance for Doubtful Accounts Receivable, Current Accounts receivable, gross Accounts Receivable, Gross, Current Accounts receivable related to joint interest owners Oil and Gas Joint Interest Billing Receivables Severance tax receivable Nontrade Receivables, Current Other receivables Other Receivables Percentage of working interest in wells Percentage of Working Interest Interest in Wells Percentage of working interest interest in wells. Total amount of supervision fees charged to wells Supervision Fees Supervision fees. Income Tax Expense (Benefit) Income Tax Expense (Benefit) Previous Federal Corporate Tax Rate Previous Federal Corporate Tax Rate Previous Federal Corporate Tax Rate New Federal Corporate Tax Rate New Federal Corporate Tax Rate New Federal Corporate Tax Rate Trade accounts payable Accounts Payable, Trade, Current Accrued operating expenses Accrued Liabilities, Current Accrued payroll costs Employee-related Liabilities, Current Asset retirement obligation - current portion Asset Retirement Obligation, Current Accrued non-income based taxes Taxes Payable, Current Accrued corporate and legal fees Accrued Professional Fees, Current Other payables Accounts Payable, Other, Current Accounts payable and accrued liabilities Accounts Payable and Accrued Liabilities, Current Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Restricted Cash Restricted Cash Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Purchase of treasury stock (shares) Treasury Stock, Shares, Acquired Other Commitment Other Commitment Lessee, Operating Lease, Term of Contract Lessee, Operating Lease, Term of Contract Revenue Recognition [Abstract] Revenue Recognition, Policy Revenue Recognition, Policy [Policy Text Block] Earnings Per Share [Abstract] Earnings Per Share, Policy Earnings Per Share, Policy [Policy Text Block] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Award Type [Axis] Award Type [Axis] Award Type [Domain] Equity Award [Domain] Stock Options [Member] Employee Stock Option [Member] Restricted Stock Units (RSUs) [Member] Restricted Stock Units (RSUs) [Member] Performance Shares [Member] Performance Shares [Member] Equity Components [Axis] Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Warrant [Member] Warrant [Member] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Basic EPS: Earnings Per Share, Basic [Abstract] Net Income (Loss) Net Income (Loss) Attributable to Parent Income, share amounts Weighted Average Number of Shares Outstanding, Basic Earnings Per Share, Basic Earnings Per Share, Basic Dilutive Securities: Dilutive Securities, Effect on Basic Earnings Per Share [Abstract] Dilutive RSAs Incremental Common Shares Attributable to Dilutive Effect of Nonvested Shares with Forfeitable Dividends Dilutive RSUs Incremental Common Shares Attributable to Dilutive Effect of Contingently Issuable Shares Dilutive Stock Options Contingently Issuable Shares Not Included in Diluted EPS Shares not included in the calculation of diluted EPS. Contingently issuable shares are those shares that are issuable for little or no cash contingent on certain conditions being met. Diluted EPS: Earnings Per Share, Diluted [Abstract] Net Income (Loss) Available to Common Stockholders, Diluted Net Income (Loss) Available to Common Stockholders, Diluted Weighted Average Number of Shares Outstanding, Diluted Weighted Average Number of Shares Outstanding, Diluted Earnings Per Share, Diluted Earnings Per Share, Diluted Earnings Per Share (Textual) Earnings Per Share, Basic and Diluted, Other Disclosures [Abstract] Antidilutive shares excluded from EPS, shares Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Fair Value Disclosures [Abstract] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Table] Fair Value Measurements, Recurring and Nonrecurring [Table] Fair Value, Hierarchy [Axis] Fair Value, Hierarchy [Axis] Fair Value Hierarchy [Domain] Fair Value Hierarchy [Domain] Fair Value, Inputs, Level 1 [Member] Fair Value, Inputs, Level 1 [Member] Fair Value, Inputs, Level 2 [Member] Fair Value, Inputs, Level 2 [Member] Fair Value, Inputs, Level 3 [Member] Fair Value, Inputs, Level 3 [Member] Derivative Instrument [Axis] Derivative Instrument [Axis] Derivative Contract [Domain] Derivative Contract [Domain] Natural Gas Contract [Member] Energy Related Derivative [Member] Natural Gas Basis Contract [Member] Other Contract [Member] Natural Gas Liquid Derivative [Member] Natural Gas Liquid Derivative [Member] Natural Gas Liquid Derivative [Member] Oil Contract [Member] Commodity Contract [Member] Oil Basis Derivative [Member] Oil Basis Derivative [Member] Oil Basis Derivative [Member] Measurement Frequency [Axis] Measurement Frequency [Axis] Fair Value, Measurement Frequency [Domain] Fair Value, Measurement Frequency [Domain] Fair Value, Measurements, Recurring [Member] Fair Value, Measurements, Recurring [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] Derivative Asset Derivative Asset Derivative Liability Derivative Liability Organization, Consolidation and Presentation of Financial Statements [Abstract] General Information Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Summary of Significant Accounting Policies Significant Accounting Policies [Text Block] Disclosure of Compensation Related Costs, Share-based Payments [Abstract] Share-Based Compensation Disclosure of Compensation Related Costs, Share-based Payments [Text Block] Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Derivative Instruments and Hedging Activities Disclosure [Abstract] Derivative Instruments and Hedging Activities Disclosures [Table] Derivative Instruments and Hedging Activities Disclosures [Table] Financial Instrument [Axis] Financial Instrument [Axis] Financial Instruments [Domain] Financial Instruments [Domain] Swap [Member] Swap [Member] Basis Swap [Member] Basis Swap [Member] Oil Derivative Swaps [Member] Natural Gas Derivative Swaps [Member] Natural Gas Basis Derivative Swaps [Member] Balance Sheet Location [Axis] Balance Sheet Location [Axis] Balance Sheet Location [Domain] Balance Sheet Location [Domain] Other Current Assets [Member] Other Current Assets [Member] Other Noncurrent Assets [Member] Other Noncurrent Assets [Member] Other Current Liabilities [Member] Other Current Liabilities [Member] Other Noncurrent Liabilities [Member] Other Noncurrent Liabilities [Member] Derivative Maturity Date [Axis] Derivative Maturity Date [Axis] Derivative Maturity Date [Axis] Derivative Maturity Date [Domain] Derivative Maturity Date [Domain] [Domain] for Derivative Maturity Date [Axis] Third Quarter 2018 [Member] Third Quarter 2018 [Member] Third Quarter 2018 [Member] Fourth Quarter 2018 [Member] Fourth Quarter 2018 [Member] Fourth Quarter 2018 [Member] First Quarter 2019 [Member] First Quarter 2019 [Member] First Quarter 2019 [Member] Second Quarter 2019 [Member] Second Quarter 2019 [Member] Second Quarter 2019 [Member] Third Quarter 2019 [Member] Third Quarter 2019 [Member] Third Quarter 2019 [Member] Fourth Quarter 2019 [Member] Fourth Quarter 2019 [Member] Fourth Quarter 2019 [Member] First Quarter 2020 [Member] First Quarter 2020 [Member] First Quarter 2020 [Member] Second Quarter 2020 [Member] Second Quarter 2020 [Member] Second Quarter 2020 [Member] Third Quarter 2020 [Member] Third Quarter 2020 [Member] Third Quarter 2020 [Member] Fourth Quarter 2020 [Member] Fourth Quarter 2020 [Member] Fourth Quarter 2020 [Member] Derivative Instruments and Hedging Activities Disclosures [Line Items] Derivative Instruments and Hedging Activities Disclosures [Line Items] Gain (Loss) on Price Risk Derivatives, Net Gain (Loss) on Price Risk Derivatives, Net Cash Received (Paid) On Settlements of Derivative Contracts Cash Received (Paid) On Settlements of Derivative Contracts Cash received (paid) on settlement of derivative contracts not designated or qualifying as hedging instruments during the period. Receivables for Settled Derivatives Receivables for Settled Derivatives Receivables for Settled Derivatives Payables for Settled Derivatives Payables for Settled Derivatives Payables for Settled Derivatives Derivative Asset, Fair Value, Gross Asset Derivative Asset, Fair Value, Gross Asset Derivative Liability, Fair Value, Gross Liability Derivative Liability, Fair Value, Gross Liability Derivative, Fair Value, Net Derivative, Fair Value, Net Portion of Future Oil and Gas Production Being Hedged Portion of Future Oil and Gas Production Being Hedged Derivative, Swap Type, Fixed Price Derivative, Swap Type, Average Fixed Price Future Gas Production Hedged in MMBtu (Energy Item Type) Future Gas Production Hedged in MMBtu (Energy Item Type) Future Gas Production Hedged in MMBtu (Energy Item Type) Derivative, Basis Swap Type, Fixed Price Basis Differential Derivative Swap Basis Differential Derivative Swap Future NGL Production Hedged in Bbls (Energy Item Type) Future NGL Production Hedged in Bbls (Energy Item Type) Future NGL Production Hedged in Bbls (Energy Item Type) Statement of Stockholders' Equity [Abstract] Stock issued for benefit plans Stock Issued During Period, Shares, Employee Stock Ownership Plan Options exercised Stock Issued During Period, Shares, Other Purchase of treasury stock (shares) Employee stock purchase plan Stock Issued During Period, Shares, Employee Stock Purchase Plans Issuance of restricted stock (shares) Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures Issuance of common stock (shares) Stock Issued During Period, Shares, New Issues Share-based Compensation, Option and Incentive Plans Policy Share-based Compensation, Option and Incentive Plans Policy [Policy Text Block] Debt Disclosure [Abstract] Schedule of Long-term Debt Instruments [Table] Schedule of Long-term Debt Instruments [Table] Long-term Debt, Type [Axis] Long-term Debt, Type [Axis] Long-term Debt, Type [Domain] Long-term Debt, Type [Domain] Line of Credit [Member] Line of Credit [Member] Debt Instrument [Axis] Debt Instrument [Axis] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] New Credit Facility [Member] New Credit Facility [Member] New Credit Facility [Member] Second Lien Notes [Member] Second Lien Notes [Member] Second Lien Notes [Member] Minimum [Member] Types of Interest Rates [Axis] Variable Rate [Axis] Types of Interest Rates [Domain] Variable Rate [Domain] Alternative Base Interest Rate [Member] Base Rate [Member] London Interbank Offered Rate (LIBOR) [Member] London Interbank Offered Rate (LIBOR) [Member] Debt Instrument [Line Items] Debt Instrument [Line Items] Bank Borrowings Line of Credit Facility [Abstract] Debt Issuance Costs, Net Debt Issuance Costs, Net Long-term Debt, excluding current maturities Long-term Debt, Excluding Current Maturities Line of Credit Facility, Current Borrowing Capacity Line of Credit Facility, Current Borrowing Capacity Decrease in applicable margin to calculate interest Decrease in applicable margin to calculate interest Decrease in applicable margin to calculate interest Line of Credit Facility, Maximum Borrowing Capacity Line of Credit Facility, Maximum Borrowing Capacity Line of Credit, Letters of Credit Issuable Line of Credit, Letters of Credit Issuable Line of Credit, Letters of Credit Issuable Debt instrument escalating basis spread on base rate Debt Instrument Escalating Basis Spread on Base Rate Debt instrument escalating basis spread on base rate. Debt Instrument Escalating Rates for Eurodollar Rate Loans Debt Instrument Escalating Rates for Eurodollar Rate Loans debt instrument escalating rates for Eurodollar rate loans. Commitment fee basis points for the credit facility Line of Credit Facility, Commitment Fee Percentage Line of Credit, Additional Interest Due to Payment Default Line of Credit, Additional Interest Due to Payment Default Line of Credit, Additional Interest Due to Payment Default Line of Credit, Required Security Interest on Oil and Gas Properties Line of Credit, Required Security Interest on Oil and Gas Properties Line of Credit, Required Security Interest on Oil and Gas Properties Line of Credit, Covenant, Debt to EBITDA Ratio, Minimum Line of Credit, Covenant, Debt to EBITDA Ratio, Minimum Line of Credit, Covenant, Debt to EBITDA Ratio, Minimum Line of Credit, Covenant, Current Ratio, Minimum Line of Credit, Covenant, Current Ratio, Minimum Line of Credit, Covenant, Current Ratio, Minimum Gross interest expense including amortization of debt issuance costs Interest Expense Commitment fees included in interest expense, net Line of Credit Facility, Commitment Fee Amount Capitalized interest on our unproved properties Interest Costs Capitalized Second Lien [Abstract] Second Lien [Abstract] Second Lien [Abstract] Long-term debt, gross Long-term Debt, Gross Debt Instrument, Unamortized Discount Debt Instrument, Unamortized Discount Additional notes issuable Additional notes issuable Additional notes issuable Additional interest in the event of default Additional interest in the event of default Additional interest in the event of default Make whole premium during years 1 and 2 Make whole premium during years 1 and 2 Make whole premium during years 1 and 2 Make whole premium during year 3 Make whole premium during year 3 Make whole premium during year 3 Make whole premium during year 4 Make whole premium during year 4 Make whole premium during year 4 Second Lien, Required Security Interest on Proved Reserves Second Lien, Required Security Interest on Proved Reserves Second Lien, Required Security Interest on Proved Reserves Second Lien, Required Security Interest on Oil and Gas Properties Second Lien, Required Security Interest on Oil and Gas Properties Second Lien, Required Security Interest on Oil and Gas Properties Second Lien, Asset Coverage Ratio, Minimum Second Lien, Asset Coverage Ratio, Minimum Second Lien, Asset Coverage Ratio, Minimum Second Lien, Covenant, Debt to EBITDA Ratio, Minimum Second Lien, Covenant, Debt to EBITDA Ratio, Minimum Second Lien, Covenant, Debt to EBITDA Ratio, Minimum Long-term debt, net Long-term Debt Commitments and Contingencies, Policy Commitments and Contingencies, Policy [Policy Text Block] Income Statement [Abstract] Revenues: Revenues [Abstract] Oil and gas sales Oil and Gas Sales Revenue Costs and Expenses: Cost of Revenue [Abstract] General and administrative, net General and Administrative Expense Depreciation, depletion, and amortization Depreciation, Depletion and Amortization Accretion of asset retirement obligation Asset Retirement Obligation, Accretion Expense Lease operating costs Oil and Gas Property, Lease Operating Expense Transportation and gas processing Gas Gathering, Transportation, Marketing and Processing Costs Severance and other taxes Taxes, Other Operating Expenses Operating Expenses Operating Income (Loss) Operating Income (Loss) Net gain (loss) on commodity derivatives Gain (Loss) on Derivative Instruments, Net, Pretax Interest expense, net Other Nonoperating Income (Expense) Other Nonoperating Income (Expense) Income (Loss) Before Income Taxes Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest Provision (Benefit) for Income Taxes Net Income (Loss) Per Share Amounts- Weighted Average Shares Outstanding - Basic Weighted Average Shares Outstanding - Diluted Costs and Expenses [Abstract] Costs and Expenses [Abstract] Fair Value Measurements Fair Value Disclosures [Text Block] Asset Retirement Obligation Disclosure [Abstract] Asset Retirement Obligation Asset Retirement Obligation Accretion expense Liabilities incurred for new wells and facilities construction Asset Retirement Obligation, Liabilities Incurred Reductions due to sold wells and facilities Asset Retirement Obligation, Liabilities Settled Reductions due to plugged wells and facilities Asset Retirement Obligation, Liabilities Plugged Asset Retirement Obligation, Liabilities Plugged Revisions in estimates Asset Retirement Obligation, Revision of Estimate Reconciliation of the numerators and denominators used in the calculation of Basic and Diluted EPS Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Statement [Table] Statement [Table] Statement, Equity Components [Axis] Common Stock Common Stock [Member] Additional Paid-in Capital Additional Paid-in Capital [Member] Treasury Stock Treasury Stock [Member] Retained Earnings (Accumulated Deficit) Retained Earnings [Member] Statement [Line Items] Statement [Line Items] Beginning Balance Stockholders' Equity Attributable to Parent Shares issued from option exercise Stock Issued During Period, Value, Other Purchase of treasury shares Treasury Stock, Value, Acquired, Cost Method Issuance of common stock Stock Issued During Period, Value, New Issues Issuance of restricted stock Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures Amortization of share-based compensation Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition Ending Balance Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Price-Risk Management Activities Derivatives and Fair Value [Text Block] Statement of Cash Flows [Abstract] Cash Flows from Operating Activities: Net Cash Provided by (Used in) Operating Activities [Abstract] Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities Adjustments to reconcile net income to net cash provided by operating activities - Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Deferred income taxes Increase (Decrease) in Deferred Income Taxes Stock-based compensation expenses Share-based Compensation Loss (gain) on derivatives Gain (Loss) on Sale of Derivatives Cash settlements on derivatives Settlements of asset retirement obligations Asset Retirement Obligation, Cash Paid to Settle Debt issuance cost write-down Write off of Deferred Debt Issuance Cost Other Noncash Income (Expense) Other Noncash Income (Expense) (Increase) decrease in accounts receivable and other current assets Increase (Decrease) in Accounts Receivable Increase (decrease) in accounts payable and accrued liabilities Increase (Decrease) in Accounts Payable and Accrued Liabilities Increase (decrease) in accrued interest Increase (Decrease) in Interest Payable, Net 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] Additions to property and equipment Payments to Acquire Property, Plant, and Equipment Proceeds from the sale of property and equipment Proceeds from Sale of Property, Plant, and Equipment Payments on property sale obligations Payments for (Proceeds from) Other Investing Activities Transfer of company funds from restricted cash Increase in Restricted Cash 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 bank borrowings Proceeds from Lines of Credit Payments of bank borrowings Repayments of Lines of Credit Net proceeds from issuances of common stock Proceeds from Issuance or Sale of Equity Purchase of treasury shares Payments for Repurchase of Common Stock Payments of debt issuance costs Payments of Debt Issuance Costs Net Cash Provided by (Used in) 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), Excluding Exchange Rate Effect Supplemental Disclosures of Cash Flows Information: Supplemental Cash Flow Information [Abstract] Cash paid during period for interest, net of amounts capitalized Interest Paid, Net Changes in capital accounts payable and capital accruals Increase (decrease) in accrued payables for capital Increase (decrease) in accrued payables for capital Increase (decrease) in other long-term liabilities for capital expenditures Increase (decrease) in other long-term liabilities for capital expenditures Increase (decrease) in other long-term liabilities for capital expenditures Price-Risk Management Activities, Policy Derivatives, Policy [Policy Text Block] Asset Retirement Obligations Asset Retirement Obligation Disclosure [Text Block] Principles of Consolidation Consolidation, Policy [Policy Text Block] Use of Estimates Use of Estimates, Policy [Policy Text Block] Property and Equipment Property, Plant and Equipment, Policy [Policy Text Block] Full-Cost Ceiling Test Full Cost or Successful Efforts, Policy [Policy Text Block] Accounts Receivable, Net Receivables, Policy [Policy Text Block] Supervision Fees Supervision Fees [Policy Text Block] Disclosure of accounting policy for allocation of supervision fees. Income Taxes Income Tax, Policy [Policy Text Block] Accounts Payable and Accrued Liabilities Accounts Payable and Accrued Liabilities [Policy Text Block] Accounts payable and accrued liabilities. Cash and Cash Equivalents and Restricted Cash Cash and Cash Equivalents, Restricted Cash and Cash Equivalents, Policy [Policy Text Block] Treasury Stock Treasury Stock [Policy Text Block] Treasury Stock [Policy Text Block] New Accounting Pronouncements New Accounting Pronouncements, Policy [Policy Text Block] Earnings Per Share Earnings Per Share [Text Block] Statement of Financial Position [Abstract] ASSETS Assets [Abstract] Current Assets: Assets, Current [Abstract] Cash and cash equivalents Accounts receivable, net Accounts Receivable, Net, Current Fair value of commodity derivatives Derivative Asset, Current Other current assets Other Assets, Current Total Current Assets Assets, Current Property and Equipment: Property, Plant and Equipment, Net [Abstract] Property and Equipment Property, Plant and Equipment, Other, Gross Net Furniture, Fixtures and other equipment Fair value of long-term commodity derivatives Derivative Asset, Noncurrent Other Long-Term Assets Other Assets, Noncurrent Total Assets Assets LIABILITIES AND STOCKHOLDERS' EQUITY Liabilities and Equity [Abstract] Current Liabilities: Liabilities, Current [Abstract] Accounts payable and accrued liabilities Fair value of commodity derivatives Derivative Liability, Current Accrued capital costs Other Accrued Liabilities, Current Accrued interest Interest Payable, Current Undistributed oil and gas revenues Other Liabilities, Current Total Current Liabilities Liabilities, Current Long-Term Debt Deferred Tax Liabilities Deferred Tax Liabilities, Net, Noncurrent Asset Retirement Obligation Asset Retirement Obligations, Noncurrent Fair value of long-term commodity derivatives Derivative Liability, Noncurrent Other Long-Term Liabilities Other Liabilities, Noncurrent Stockholders' Equity: Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract] Preferred Stock, Value, Outstanding Preferred Stock, Value, Outstanding Common stock, $0.01 par value Common Stock, Value, Issued Additional paid-in capital Additional Paid in Capital Treasury stock held, at cost Treasury Stock, Value Retained earnings (Accumulated deficit) Retained Earnings (Accumulated Deficit) Total Stockholders' Equity (Deficit) Total Liabilities and Stockholders' Equity Liabilities and Equity Discontinued Operations and Disposal Groups [Abstract] Disposal Groups, Including Discontinued Operations [Table] Disposal Groups, Including Discontinued Operations [Table] Disposal Group Name [Axis] Disposal Group Name [Axis] Disposal Group Name [Domain] Disposal Group Name [Domain] AWP Olmos Sale [Member] AWP Olmos Sale [Member] AWP Olmos Sale [Member] Bay De Chene [Member] Bay De Chene [Member] Bay De Chene [Member] Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] Proceeds from Sale of Oil and Gas Property and Equipment Proceeds from Sale of Oil and Gas Property and Equipment Buyer's Assumption of ARO Buyer's Assumption of ARO Buyer's Assumption of ARO Purchase and sale contract Purchase and sale contract Purchase and sale contract Payments for (Proceeds from) Other Investing Activities Long-term liability reclassified to current Long-term liability reclassified to current Long-term liability reclassified to current Cash to be released for purchase and sale contract Cash to be released for purchase and sale contract Cash to be released for purchase and sale contract Document and Entity Information [Abstract] Document and Entity Information [Abstract] Entity Registrant Name Entity Registrant Name Entity Central Index Key Entity Central Index Key Document Type Document Type Current Fiscal Year End Date Current Fiscal Year End Date Document Period End Date Document Period End Date Amendment Flag Amendment Flag Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Entity Filer Category Entity Filer Category Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Property and Equipment Accounts Payable and Accrued Liabilities Accounts Payable and Accrued Liabilities [Abstract] Accrued compensation costs Total accounts payable and accrued liabilities Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract] Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract] Long-term restricted cash Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Acquisitions and Dispositions Mergers, Acquisitions and Dispositions Disclosures [Text Block] Debt Issuance Costs, Policy Debt, Policy [Policy Text Block] Roll-forward of our asset retirement obligations Schedule of Asset Retirement Obligations [Table Text Block] Schedule of Long-term Debt Instruments Schedule of Long-term Debt Instruments [Table Text Block] Long-Term Debt Debt Disclosure [Text Block] Asset Retirement Obligations, Policy Asset Retirement Obligation [Policy Text Block] Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Products and Services [Axis] Products and Services [Axis] Products and Services [Domain] Products and Services [Domain] Oil sales [Member] Oil sales [Member] Oil sales [Member] Natural gas sales [Member] Natural gas sales [Member] Natural gas sales [Member] NGL sales [Member] NGL sales [Member] NGL sales [Member] Other sales [Member] Other sales [Member] Other sales [Member] Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] Oil, natural gas and NGL sales Revenue from Contract with Customer, Excluding Assessed Tax Oil and gas sales, by product [Table Text Block] Disaggregation of Revenue [Table Text Block] Schedule of Derivative Instruments [Table Text Block] Schedule of Derivative Instruments [Table Text Block] Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table] Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table] Share-based Expense Location [Axis] Income Statement Location [Axis] Share-based Expense Location [Domain] Income Statement Location [Domain] General and Administrative Expense [Member] General and Administrative Expense [Member] Range of Payout [Axis] Range of Payout [Domain] Award Type [Axis] Employee Stock Option [Member] Performance-based stock unit [Member] Performance-based stock unit [Member] Performance-based stock unit [Member] Share-based Compensation (Details Textual) Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-based compensation (capitalized) Employee Service Share-based Compensation, Allocation of Recognized Period Costs, Capitalized Amount Stock option award vesting period Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period Stock option award unrecognized compensation Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized Stock option award outstanding aggregate intrinsic value Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value Remaining contract life of outstanding stock options. Remaining contract life of outstanding stock options. Remaining contract life of outstanding stock options. Remaining contract life of exercisable stock option Remaining Contract Life of Exercisable Stock Option Remaining contract life of exercisable stock option. Stock option award exercisable aggregate intrinsic value Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value Unrecognized compensation expense weighted-average period Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition 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 Stock Option Activity Share-based Compensation Arrangement by Share-based Payment Award, Additional General Disclosures [Abstract] Options outstanding, beginning of period, shares Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number Options outstanding, beginning of period, weighted average price Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price Options granted, shares Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures Options granted, weighted average price Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price Options forfeited, shares Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period Options forfeited, weighted average share price Share-based Compensation Arrangements by Share-based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price Options canceled, shares Share-based Compensation Arrangement by Share-based Payment Award, Options, Expirations in Period Options canceled, weighted average price Share-based Compensation Arrangements by Share-based Payment Award, Options, Expirations in Period, Weighted Average Exercise Price Options exercised, shares Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Options exercised, weighted average price Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price Options exercisable, end of period, shares Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number Options exercisable, end of period, weighted average price Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price Restricted stock activity Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Restricted shares outstanding, beginning of period, shares Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number Restricted shares outstanding, beginning of period, weighted average price Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value Restricted shares granted, shares Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period Restricted shares granted, weighted average price Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Restricted shares forfeited, shares Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period Restricted shares forfeited, weighted average price Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value Restricted shares vested, shares Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period Restricted shares vested, weighted average price Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value Restricted shares outstanding, end of period, shares Restricted shares outstanding, end of period, weighted average price Percent of payout for performance based stock units Percent of payout for performance based stock units Percent of payout for performance based stock units Fair Value of Financial Instruments, Policy Fair Value of Financial Instruments, Policy [Policy Text Block] Property and Equipment Property, Plant and Equipment [Table Text Block] Accounts Payable and Accrued Liabilities Schedule of Accounts Payable and Accrued Liabilities [Table Text Block] Cash, Cash Equivalents and Restricted Cash Cash, Cash Equivalents and Restricted Cash [Table Text Block] Tabular reconciliation disclosure of the total cash, cash equivalents and restricted cash in the statement of cash flows and their corresponding balance sheet presentation Revenue Recognition Revenue from Contract with Customer [Text Block] Capitalized Costs, unproved property balance Preferred stock, par value (in dollars per share) Preferred Stock, Par or Stated Value Per Share Preferred stock, shares authorized Preferred Stock, Shares Authorized Preferred stock, shares outstanding Preferred Stock, Shares Outstanding Common stock, par value per share (in dollars per share) Common Stock, Par or Stated Value Per Share Common stock, shares authorized Common Stock, Shares Authorized Common stock, shares issued Common Stock, Shares, Issued Common stock, shares outstanding Common Stock, Shares, Outstanding Treasury stock shares held, at cost Treasury Stock, Shares Stock option activity Share-based Compensation, Stock Options, Activity [Table Text Block] Restricted stock activity Schedule of Nonvested Restricted Stock Units Activity [Table Text Block]