Earnings Per Share [Abstract] 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] Leases [Abstract] Lease, Cost [Table Text Block] Lease, Cost [Table Text Block] Lessee, Operating Lease, Disclosure [Table Text Block] Lessee, Operating Lease, Disclosure [Table Text Block] Lessee, Operating Lease, Liability, Maturity [Table Text Block] Lessee, Operating Lease, Liability, Maturity [Table Text Block] Schedule of Cash Flow, Supplemental Disclosures [Table Text Block] Schedule of Cash Flow, Supplemental Disclosures [Table Text Block] Organization, Consolidation and Presentation of Financial Statements [Abstract] General Information Organization, Consolidation and Presentation of Financial Statements Disclosure [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] Statistical Measurement [Axis] Statistical Measurement [Axis] Statistical Measurement [Domain] Statistical Measurement [Domain] Minimum [Member] Minimum [Member] Maximum [Member] Maximum [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 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 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. 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 Schedule of Long-term Debt Instruments Schedule of Long-term Debt Instruments [Table Text Block] Long-Term Debt Debt Disclosure [Text Block] Share-based Payment Arrangement [Abstract] Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table] Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table] Income Statement Location [Axis] Income Statement Location [Axis] Income Statement 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] Award Type [Axis] Award Type [Domain] Award Type [Domain] Share-based Payment Arrangement, Option - Equity Exchange Award [Member] Share-based Payment Arrangement, Option - Equity Exchange Award [Member] Share-based Payment Arrangement, Option - Equity Exchange Award [Member] Share-based Payment Arrangement, Option [Member] Share-based Payment Arrangement, Option [Member] Restricted Stock Units (RSUs) [Member] Restricted Stock Units (RSUs) [Member] Restricted Stock Units (RSUs) - Equity Exchange Award [Member] Restricted Stock Units (RSUs) - Equity Exchange Award [Member] Restricted Stock Units (RSUs) - Equity Exchange Award [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] Stock-based compensation expenses Share-based Payment Arrangement, Noncash Expense Share-based compensation (capitalized) Share-based Payment Arrangement, Amount Capitalized Stock option award unrecognized compensation Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount Stock option award vesting period Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 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 Share-based Payment Arrangement, Nonvested Award, 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 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 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 Disclosures [Abstract] 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] Lessee, Lease, Description [Table] Lessee, Lease, Description [Table] Balance Sheet Location [Axis] Balance Sheet Location [Axis] Balance Sheet Location [Domain] Balance Sheet Location [Domain] Property, Plant and Equipment [Member] Property, Plant and Equipment [Member] Lease Operating Expense [Member] Lease Operating Expense [Member] Lease Operating Expense [Member] Lessee, Lease, Description [Line Items] Lessee, Lease, Description [Line Items] Short-term Lease, Cost Short-term Lease, Cost Operating Lease, Cost Operating Lease, Cost Lease, Cost Lease, Cost 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 Lessee, Operating Lease, Liability, Payments, Remainder of Fiscal Year Lessee, Operating Lease, Liability, Payments, Remainder of Fiscal Year Lessee, Operating Lease, Liability, Payments, Due Year Two Lessee, Operating Lease, Liability, Payments, Due Year Two Lessee, Operating Lease, Liability, Payments, Due Year Three Lessee, Operating Lease, Liability, Payments, Due Year Three Lessee, Operating Lease, Liability, Payments, Due Year Four Lessee, Operating Lease, Liability, Payments, Due Year Four Lessee, Operating Lease, Liability, Payments, Due Year Five Lessee, Operating Lease, Liability, Payments, Due Year Five Lessee, Operating Lease, Liability, Payments, Due after Year Five Lessee, Operating Lease, Liability, Payments, Due after Year Five Lessee, Operating Lease, Liability, Payments, Due Lessee, Operating Lease, Liability, Payments, Due Lessee, Operating Lease, Liability, Undiscounted Excess Amount Lessee, Operating Lease, Liability, Undiscounted Excess Amount Operating Lease, Liability Operating Lease, Liability Operating Lease, Payments Operating Lease, Payments Operating Lease, Payments, Use Operating Lease, Payments, Use 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] Collar Contracts [Member] Forward Contracts [Member] Basis Swap [Member] Basis Swap [Member] Derivative Instrument [Axis] Derivative Instrument [Axis] Derivative Contract [Domain] Derivative Contract [Domain] Oil Derivative Swaps [Member] Commodity Contract [Member] Natural Gas Derivative Swaps [Member] Energy Related Derivative [Member] Natural Gas Liquid Derivative [Member] Natural Gas Liquid Derivative [Member] Natural Gas Liquid Derivative [Member] Natural Gas Basis Derivative Swaps [Member] Other Contract [Member] Oil Basis Derivative [Member] Oil Basis Derivative [Member] Oil Basis Derivative [Member] 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 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] First Quarter 2021 [Member] First Quarter 2021 [Member] First Quarter 2021 [Member] Second Quarter 2021 [Member] Second Quarter 2021 [Member] Second Quarter 2021 [Member] Third Quarter 2021 [Member] Third Quarter 2021 [Member] Third Quarter 2021 [Member] Fourth Quarter 2021 [Member] Fourth Quarter 2021 [Member] Fourth Quarter 2021 [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 Oil and Gas Production Hedged Volumes Derivative, Nonmonetary Notional Amount Derivative, Swap Type, Fixed Price Derivative, Swap Type, Average Fixed Price Derivative, Average Floor Price Derivative, Average Floor Price Derivative, Average Cap Price Derivative, Average Cap Price Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Accounting Policies [Abstract] Property and Equipment Property, Plant and Equipment [Table Text Block] Disaggregation of Revenue [Table Text Block] Disaggregation of Revenue [Table Text Block] Accounts Payable and Accrued Liabilities Schedule of Accounts Payable and Accrued Liabilities [Table Text Block] Statement of Cash Flows [Abstract] Cash Flows from Operating Activities: Net Cash Provided by (Used in) Operating Activities [Abstract] Net Income (Loss) Net Income (Loss) Attributable to Parent 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] Depreciation, depletion, and amortization Depreciation, Depletion and Amortization Accretion of asset retirement obligation Asset Retirement Obligation, Accretion Expense Deferred income taxes Increase (Decrease) in Deferred Income Taxes 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 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 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 Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Supplemental Disclosures of Cash Flows Information: Supplemental Cash Flow Information [Abstract] Cash paid during period for interest, net of amounts capitalized Interest Paid, Excluding Capitalized Interest, Operating Activities 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 Fair Value of Financial Instruments, Policy Fair Value of Financial Instruments, Policy [Policy Text Block] 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 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 Earnings Per Share Earnings Per Share [Text Block] Schedule of Derivative Instruments [Table Text Block] Schedule of Derivative Instruments [Table Text Block] Asset Retirement Obligation Disclosure [Abstract] Roll-forward of our asset retirement obligations Schedule of Asset Retirement Obligations [Table Text Block] 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 Asset retirement obligation - current portion Asset Retirement Obligation, Current Asset Retirement Obligations, Policy Asset Retirement Obligation [Policy Text Block] Statement of Financial Position [Abstract] ASSETS Assets [Abstract] Current Assets: Assets, Current [Abstract] Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Accounts receivable, net Accounts Receivable, after Allowance for Credit Loss, 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, full cost method Property, Plant and Equipment, Gross Less - Accumulated depreciation, depletion, and amortization Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Net Furniture, Fixtures and other equipment Property, Plant and Equipment, Net Right of Use Assets Operating Lease, Right-of-Use Asset Fair value of long-term commodity derivatives Derivative Asset, Noncurrent Deferred Tax Asset Deferred Tax Assets, Net 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 Accounts Payable and Accrued Liabilities, Current Fair value of commodity derivatives Derivative Liability, Current Accrued capital costs Other Accrued Liabilities, Current Accrued interest Interest Payable, Current Current lease liability Capital Lease Obligations, Current Undistributed oil and gas revenues Other Liabilities, Current Total Current Liabilities Liabilities, Current Long-Term Debt Non-current Lease Liability Capital Lease Obligations, Noncurrent 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 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) Stockholders' Equity Attributable to Parent Total Liabilities and Stockholders' Equity Liabilities and Equity Commitments and Contingencies, Policy Commitments and Contingencies, Policy [Policy 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 Receivable [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] Revenue Recognition Revenue [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, Restricted Cash and Cash Equivalents, Policy [Policy Text Block] 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] 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 Emerging Growth Company Entity Emerging Growth Company Entity Small Business Entity Small Business Entity Shell Company Entity Shell Company Entity Interactive Data Current Entity Interactive Data Current Entity Current Reporting Status Entity Current Reporting Status Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Schedule of Accounts, Notes, Loans and Financing Receivable [Table] Schedule of Accounts, Notes, Loans and Financing Receivable [Table] Product and Service [Axis] Product and Service [Axis] Product and Service [Domain] Product and Service [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] Line of Credit [Member] Minimum [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 Net Furniture, Fixtures and other equipment Estimated useful lives of property Property, Plant and Equipment, Useful Life 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 Accounts Receivable, Allowance for Credit Loss, Current Accounts receivable, gross Accounts Receivable, before Allowance for Credit Loss, 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. Partial Release of Valuation Allowance Partial Release of Valuation Allowance Partial Release of Valuation Allowance Income Tax Expense (Benefit) Income Tax Expense (Benefit) State and Local Income Tax Expense (Benefit), Continuing Operations State and Local Income Tax Expense (Benefit), Continuing Operations Oil and gas sales Revenue from Contract with Customer, Excluding Assessed Tax Trade accounts payable Accounts Payable, Trade, Current Accrued operating expenses Accrued Liabilities, Current Accrued payroll costs Employee-related Liabilities, 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 Purchase of treasury stock (shares) Treasury Stock, Shares, Acquired Operating Lease, Right-of-Use Asset Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Income Statement [Abstract] Costs and Expenses [Abstract] Costs and Expenses [Abstract] General and administrative, net General and Administrative Expense Lease operating costs Results of Operations, Production or Lifting Costs Workovers Results of Operations, Expense, Other Transportation and gas processing Results of Operations, Transportation 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- Earnings Per Share, Basic Earnings Per Share, Basic Earnings Per Share, Diluted Earnings Per Share, Diluted Weighted Average Shares Outstanding - Basic Weighted Average Number of Shares Outstanding, Basic Weighted Average Shares Outstanding - Diluted Weighted Average Number of Shares Outstanding, Diluted Summary of Significant Accounting Policies Significant Accounting Policies [Text Block] Stock option activity Share-based Payment Arrangement, Option, Activity [Table Text Block] Restricted stock activity Schedule of Nonvested Restricted Stock Units Activity [Table Text Block] Statement of Stockholders' Equity [Abstract] Statement [Table] Statement [Table] Statement, Equity Components [Axis] Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Common Stock Common Stock [Member] Additional Paid-in Capital Additional Paid-in Capital [Member] Treasury Stock Treasury Stock, Common [Member] Retained Earnings (Accumulated Deficit) Retained Earnings [Member] Statement [Line Items] Statement [Line Items] Beginning Balance Shares issued from option exercise Stock Issued During Period, Value, Other Purchase of treasury shares Treasury Stock, Value, Acquired, Cost Method Issuance of restricted stock Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures Amortization of share-based compensation APIC, Share-based Payment Arrangement, Increase for Cost Recognition Ending Balance Price-Risk Management Activities, Policy Derivatives, Policy [Policy Text Block] Options exercised Stock Issued During Period, Shares, Other Purchase of treasury stock (shares) Issuance of restricted stock (shares) Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures Stock Issued During Period, Shares, New Issues Stock Issued During Period, Shares, New Issues 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 Lessee, Operating Leases [Text Block] Leases of Lessee Disclosure [Text Block] Fair Value Measurements Fair Value Disclosures [Text Block] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Table] Fair Value, Recurring and Nonrecurring [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 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] Natural Gas Contract [Member] Natural Gas Basis Contract [Member] Oil Contract [Member] Measurement Frequency [Axis] Measurement Frequency [Axis] Measurement Frequency [Domain] Measurement Frequency [Domain] Fair Value, Recurring [Member] Fair Value, 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 Debt Issuance Costs, Policy Debt, Policy [Policy Text Block] Lessee, Leases [Policy Text Block] Lessee, Leases [Policy Text Block] Price-Risk Management Activities Derivatives and Fair Value [Text Block] Asset Retirement Obligations Asset Retirement Obligation Disclosure [Text Block] Earnings Per Share, Policy Earnings Per Share, Policy [Policy Text Block] Commitments under non-cancelable leases Other Commitments [Table Text Block] Share-based Compensation, Option and Incentive Plans Policy Share-based Payment Arrangement [Policy Text Block] Share-Based Compensation Share-based Payment Arrangement [Text Block] Property and Equipment Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] Accounts Payable and Accrued Liabilities Accounts Payable and Accrued Liabilities [Abstract] Accrued compensation costs Total accounts payable and accrued liabilities 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] Stock Options [Member] Performance Shares [Member] Performance Shares [Member] Equity Components [Axis] 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] Income, share amounts 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 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 Other Commitments [Table] Other Commitments [Table] Other Commitments [Axis] Other Commitments [Axis] Other Commitments [Domain] Other Commitments [Domain] Operating lease commitments [Member] Operating lease commitments [Member] Operating lease commitments under non-cancelable obligations [Member] Other Commitments [Line Items] Other Commitments [Line Items] 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 Operating Leases, Future Minimum Payments Due Acquisitions and Dispositions Mergers, Acquisitions and Dispositions Disclosures [Text Block]