Commitments and Contingencies Disclosure [Abstract] Other Commitments [Table] Other Commitments [Table] Major Property Class [Axis] Major Property Class [Axis] Major Property Class [Domain] Major Property Class [Domain] Building [Member] Building [Member] 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] Gas transportation and processing obligations [Member] Gas transportation and processing obligations [Member] Gas transportation and processing obligations [Member] Drilling Commitments [Member] Drilling Commitments [Member] Drilling Commitments [Member] Executive Severance Agreements [Member] Executive Severance Agreements [Member] Executive Severance Agreements [Member] Other Commitments [Line Items] Other Commitments [Line Items] Obligations (Textual) Leases [Abstract] Operating Leases, Rent Expense Operating Leases, Rent Expense Building Sub-lease term Lessee, Operating Lease, Term of Contract Operating Leases, Future Minimum Payments Due Operating Leases, Future Minimum Payments Due 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 Contractual Obligation, Due in Next Fiscal Year Contractual Obligation, Due in Next Fiscal Year Contractual Obligation, Due in Second Year Contractual Obligation, Due in Second Year Contractual Obligation, Due in Third Year Contractual Obligation, Due in Third Year Contractual Obligation, Due in Fourth Year Contractual Obligation, Due in Fourth Year Contractual Obligation, Due in Fifth Year Contractual Obligation, Due in Fifth Year Contractual Obligation Contractual Obligation Disclosure of Compensation Related Costs, Share-based Payments [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] Award Type [Axis] Award Type [Axis] Equity Award [Domain] Equity Award [Domain] Restricted Stock Units (RSUs) [Member] Restricted Stock Units (RSUs) [Member] Employee Stock Option [Member] Employee Stock Option [Member] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Stock option details Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] Expected dividend Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Weighted Average Expected Dividend Expected volatility Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate Risk-free interest rate Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate Performance Period for Award Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term Stock options grant-date fair value Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value Stock option activity in shares and weighted average price Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] 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, shares, weighted average price Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price Options canceled, shares Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period Options canceled, weighted average price Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period, Weighted Average Exercise Price Options canceled 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 outstanding, end of period, shares Options outstanding, end of period, weighted average 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 units outstanding Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number Restricted units outstanding, 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 stock units granted Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period Restricted stock units 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 stock units forfeited Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period Restricted stock units 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 stock units vested Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period Restricted stock units 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 Debt Disclosure [Abstract] Debt Issuance Costs Debt, Policy [Policy Text Block] Fair Value Disclosures [Abstract] Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Asset Retirement Obligation Disclosure [Abstract] Asset Retirement Obligations Asset Retirement Obligation Disclosure [Text Block] Statement of Stockholders' Equity [Abstract] Statement [Table] Statement [Table] 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 [Member] Retained Earnings (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 Net Income (Loss) Net Income (Loss) Attributable to Parent Income Statement [Abstract] Revenues: Revenues [Abstract] Revenue from Contract with Customer, Excluding Assessed Tax Revenue from Contract with Customer, Excluding Assessed Tax 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 cost Operating Lease, Expense Results of Operations, Transportation Costs Results of Operations, Transportation Costs Severance and other taxes Taxes, Other Total 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 Interest Expense Other income (expense), net 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 Income Tax Expense (Benefit) Net Income (Loss) Per Share Amounts- Earnings Per Share [Abstract] Earnings (Loss) Per Share, Basic Earnings Per Share, Basic Earnings (Loss) 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 Shares issued from stock option exercises Stock Issued During Period, Shares, Other Purchase of treasury shares (shares) Treasury Stock, Shares, Acquired Issuance of common stock (shares) 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 Business Combinations [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 Wheeler Sale [Member] AWP Olmos Wheeler Sale [Member] AWP Olmos Wheeler Sale [Member] AWP working interest acquisition [Member] AWP working interest acquisition [Member] AWP working interest acquisition [Member] Bay De Chene [Member] Bay De Chene [Member] Bay De Chene [Member] AWP Olmos Sale [Member] AWP Olmos Sale [Member] AWP Olmos Sale [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 Payments to Acquire Oil and Gas Property Payments to Acquire Oil and Gas Property Purchase and sale contract Purchase and sale contract Purchase and sale contract Payments for (Proceeds from) Other Investing Activities 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 Roll-forward of our asset retirement obligations Schedule of Asset Retirement Obligations [Table Text Block] Long-Term Debt Debt Disclosure [Text Block] Commitments and Contingencies Commitments and Contingencies, Policy [Policy Text Block] Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Income Tax Disclosure [Abstract] Tax effects of temporary differences representing the net deferred tax asset (liability) Components of Deferred Tax Assets and Liabilities [Abstract] Deferred tax assets: Components of Deferred Tax Assets [Abstract] DTA, Federal net operating losses (NOLs) Deferred Tax Assets, Operating Loss Carryforwards, Domestic DTA, Alternative minimum tax credits Deferred Tax Assets, Tax Credit Carryforwards, Alternative Minimum Tax DTA, Other loss carryforwards Deferred Tax Assets, Other Loss Carryforwards DTA, Asset retirement obligations Deferred Tax Assets, Tax Deferred Expense, Other Deferred Tax Assets, Hedging Transactions Deferred Tax Assets, Hedging Transactions DTA, Unrealized share-based compensation Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-based Compensation Cost DTA, Other Deferred Tax Assets, Other DTA, Valuation Allowance Deferred Tax Assets, Valuation Allowance Total deferred tax assets Deferred Tax Assets, Gross Deferred tax liabilities: Components of Deferred Tax Liabilities [Abstract] DTL, Oil and gas exploration and development costs Deferred Tax Liabilities, Property, Plant and Equipment Deferred Tax Liabilities, Derivatives Deferred Tax Liabilities, Derivatives DTL, Other Deferred Tax Liabilities, Other Total deferred tax liabilites Deferred Tax Liabilities, Gross Net deferred tax liabilities Deferred Tax Liabilities, Net Derivative Instruments and Hedging Activities Disclosure [Abstract] Schedule of Derivative Instruments [Table Text Block] Schedule of Derivative Instruments [Table Text Block] Asset Retirement Obligations, Policy Asset Retirement Obligation [Policy Text Block] Accounting Policies [Abstract] Schedule of Accounts, Notes, Loans and Financing Receivable [Table] Schedule of Accounts, Notes, Loans and Financing Receivable [Table] 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] 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] Range [Axis] Range [Axis] Range [Domain] Range [Domain] Minimum [Member] Minimum [Member] Maximum [Member] Maximum [Member] Concentration Risk Type [Axis] Concentration Risk Type [Axis] Concentration Risk Type [Domain] Concentration Risk Type [Domain] Kinder Morgan Concentration Risk [Member] Kinder Morgan Concentration Risk [Member] Kinder Morgan Concentration Risk [Member] Accounts, Notes, Loans and Financing Receivable [Line Items] Accounts, Notes, Loans and Financing Receivable [Line Items] Summary of Significant Accounting Policies (Textual) [Abstract] Industry Specific Policies [Abstract] Total capitalized internal costs Capitalized Costs Oil and Gas Producing Activities Capitalized costs oil and gas producing activities, total. Property, Plant and Equipment, Useful Life 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 from oil and gas sales Accounts Receivable, Gross, Current Accounts receivable related to joint interest owners Oil and Gas Joint Interest Billing Receivables Severance tax credit receivables 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. 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 Restricted Cash Restricted Cash Concentration risk, percentage Concentration Risk, Percentage Treasury Stock, Shares, Acquired Operating Lease, Right-of-Use Asset Operating Lease, Right-of-Use Asset Revenue Recognition [Abstract] Revenue Recognition, Policy Revenue Recognition, Policy [Policy 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] Range of Payout [Axis] Range of Payout [Domain] Minimum Payout [Member] Maximum Payout [Member] Award Type [Domain] Performance-based stock unit [Member] Performance-based stock unit [Member] Performance-based stock unit [Member] Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs, by Report Line [Axis] Income Statement Location [Axis] Employee Service Share-based Compensation, Allocation of Recognized Period Costs, Report Line [Domain] Income Statement Location [Domain] General and Administrative Expense [Member] General and Administrative Expense [Member] Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] Stockholders' Equity (Textual) [Abstract] Share-based Compensation [Abstract] Stock-Based Compensation Plan Share-based Compensation Arrangement by Share-based Payment Award, Additional General Disclosures [Abstract] Proceeds and Excess Tax Benefit from Share-based Compensation Proceeds and Excess Tax Benefit from Share-based Compensation Share-based compensation expenses Share-based Compensation Share-based compensation (capitalized) Employee Service Share-based Compensation, Allocation of Recognized Period Costs, Capitalized Amount Shares available for future grant under stock compensation plans Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant Stock Option Awards Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract] Unrecognized compensation cost related to stock awards Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized Outstanding stock options 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. Intrinsic value of exercised stock option Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value Restricted Stock Units [Abstract] Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract] Vesting period Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period Weighted average recognition period of cost related to stock awards Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition Performance Share Units [Abstract] Share-based Compensation, Allocation and Classification in Financial Statements [Abstract] Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Percent of payout for performance based stock units Percent of payout for performance based stock units Percent of payout for performance based stock units Performance Period for Award Restricted stock units vested Employee Savings Plan [Abstract] Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract] Employee Savings Plan, Employer Matching Contribution, Percent Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay Employee Savings Plan, Maximum Annual Contribution Per Employee, Percent Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent Employee Savings Plan, Employer Discretionary Contribution Amount Defined Contribution Plan, Employer Discretionary Contribution Amount 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 Entity Emerging Growth Company Entity Emerging Growth Company Entity Small Business Entity Small Business Entity Well-known Seasoned Issuer Entity Well-known Seasoned Issuer Entity Voluntary Filers Entity Voluntary Filers Entity Current Reporting Status Entity Current Reporting Status Entity Shell Company Entity Shell Company Entity Public Float Entity Public Float Fair Value of Financial Instruments Fair Value of Financial Instruments, Policy [Policy Text Block] Statement of Financial Position [Abstract] Capitalized Costs, Unproved Properties Capitalized Costs, Unproved Properties 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 Earnings Per Share Earnings Per Share, Policy [Policy Text Block] Earnings Per Share Earnings Per Share [Text Block] Revenue Recognition Revenue from Contract with Customer [Text Block] ASSETS Assets [Abstract] Current Assets: Assets, Current [Abstract] Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Accounts receivable 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, Full Cost Method, including $56,715 and $50,377 of unproved property costs not being amortized Property, Plant and Equipment, Gross Less - Accumulated depreciation, depletion, and amortization Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Property and Equipment, Net Oil and Gas Property, Full Cost Method, Net Derivative Asset, Noncurrent 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 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 Undistributed oil and gas revenues Other Liabilities, Current Total Current Liabilities Liabilities, Current Long-Term Debt Long-term Debt, Excluding Current Maturities Deferred tax liabilities, net Deferred Tax Liabilities, Net, Noncurrent Asset Retirement Obligation Asset Retirement Obligations, Noncurrent Derivative Liability, Noncurrent 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, Value, Issued Common Stock, Value, Issued Additional paid-in capital Additional Paid in Capital Treasury Stock, Value Treasury Stock, Value Retained earnings (Accumulated deficit) Retained Earnings (Accumulated Deficit) Total Stockholders' Equity (Deficit) Total Liabilities and Stockholders' Equity Liabilities and Equity Summary of consolidated income tax provision (benefit) Income Tax Expense (Benefit), Continuing Operations [Abstract] Current income taxes Current Income Tax Expense (Benefit) Deferred income taxes Deferred Income Tax Expense (Benefit) Income tax provision (benefit) Tax Period [Axis] Tax Period [Axis] Tax Period [Domain] Tax Period [Domain] Tax Year 2015 [Member] Tax Year 2015 [Member] Tax Year 2017 [Member] Tax Year 2017 [Member] Tax Year 2018 [Member] Tax Year 2018 [Member] Effective income tax rate reconciliation, percent Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent Deferred Tax Assets, Valuation Allowance Operating Loss Carryforwards Operating Loss Carryforwards Operating Loss Carryforward, Income Tax Limitation Operating Loss Carryforward, Income Tax Limitation Operating Loss Carryforward, Income Tax Limitation Long-term debt Schedule of Long-term Debt Instruments [Table 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] Warrant [Member] Warrant [Member] Stock Options [Member] Performance Shares [Member] Performance Shares [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) Income, Share Amounts Earnings (Loss) Per Share, Basic Dilutive Securities: Dilutive Securities, Effect on Basic Earnings Per Share [Abstract] Dilutive Restricted Stock Unit Awards Incremental Common Shares Attributable to Dilutive Effect of Contingently Issuable Shares Dilutive Stock Option Awards 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 (Loss) Per Share, Diluted Earnings Per Share (Textual) [Abstract] Earnings Per Share, Basic and Diluted, Other Disclosures [Abstract] Antidilutive shares not included in the computation of diluted EPS Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Price-Risk Management Activities, Policy Derivatives, Policy [Policy Text Block] Stock Option Valuation Assumptions Schedule of Share-based Payment Award, Employee Stock Purchase Plan, Valuation Assumptions [Table Text Block] Stock Option Activity Share-based Compensation, Stock Options, Activity [Table Text Block] Restricted Stock Units Activity Schedule of Nonvested Restricted Stock Units Activity [Table Text Block] Reconciliations of income taxes computed using the U.S. Federal statutory rate to the effective income tax rates Effective Income Tax Rate Reconciliation, Amount [Abstract] Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent State tax provisions (benefits), net of federal benefits Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent Expired operating loss carryovers Effective Income Tax Rate Reconciliation, Other Adjustments, Percent Change in enacted tax rates Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent Executive compensation limitation Effective Income Tax Rate Reconciliation,Other Reconciling Items, Percent Other, net Effective Income Tax Rate Reconciliation, Deduction, Other, Percent Valuation allowance adjustments Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Percent Effective rate Effective Income Tax Rate Reconciliation, Percent 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 Oil and Gas receipts greater than 10% Oil and Gas receipts greater than 10% [Table Text Block] Oil and Gas receipts greater than 10% [Table Text Block] Acquisitions and Dispositions Mergers, Acquisitions and Dispositions Disclosures [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 to net cash provided by operation 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 expense Gain (Loss) on Sale of Derivatives Gain (Loss) on Sale of Derivatives 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. Asset Retirement Obligation, Cash Paid to Settle Asset Retirement Obligation, Cash Paid to Settle Write off of Deferred Debt Issuance Cost Write off of Deferred Debt Issuance Cost Other Noncash Income (Expense) Other Noncash Income (Expense) Change in assets and liabilities- Increase (Decrease) in Operating Capital [Abstract] (Increase) decrease in accounts receivable and other 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 income taxes payable Increase (Decrease) in Income Taxes Payable Increase (decrease) in accrued interest Increase (Decrease) in Interest Payable, Net Net Cash Provided by 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 Acquisition of properties Proceeds from the sale of property and equipment Proceeds from Sale of Property, Plant, and Equipment Payments for (Proceeds from) Other Investing Activities Decrease in Restricted Cash Increase (Decrease) in Restricted Cash Net Cash 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 long-term debt issuances Proceeds from Issuance of Other Long-term Debt 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 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, Period Increase (Decrease), Excluding Exchange Rate Effect Total 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 Increase (decrease) in accrued payables for capital 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 Disaggregation of Revenue [Table Text Block] Disaggregation of Revenue [Table Text Block] Summary of income (Loss) from continuing operations before taxes Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest [Abstract] Income (Loss) Before Income Taxes Derivative [Table] Derivative [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 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] 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] 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 Instrument [Axis] Derivative Instrument [Axis] Derivative Contract [Domain] Derivative Contract [Domain] Oil Derivative [Member] Commodity Contract [Member] Natural Gas Derivative [Member] Energy Related Derivative [Member] Natural Gas Liquid Derivative [Member] Natural Gas Liquid Derivative [Member] Natural Gas Liquid Derivative [Member] Natural Gas Basis Derivative [Member] Other Contract [Member] Oil Basis Derivative [Member] Oil Basis Derivative [Member] Oil Basis Derivative [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 [Line Items] Derivative [Line Items] Gain (Loss) on Price Risk Derivatives, Net Gain (Loss) on Price Risk Derivatives, Net 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 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, Average Floor Price Derivative, Average Floor Price Derivative, Average Cap Price Derivative, Average Cap Price 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) Derivative, Swap Type, Average Fixed Price Derivative, Swap Type, Average Fixed Price Basis Differential Derivative Swap Basis Differential Derivative Swap Basis Differential Derivative Swap 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] Summary of Significant Accounting Policies Significant Accounting Policies [Text Block] Property, Plant and Equipment [Abstract] Proved oil and gas properties Capitalized Costs, Proved Properties Unproved oil and gas properties Furniture, fixtures, and other equipment Furniture and Fixtures, Gross Property, Plant and Equipment, Net Property, Plant and Equipment, Net Accounts Payable and Accrued Liabilities [Abstract] 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 taxes Taxes Payable, Current Accrued Professional Fees, Current Accrued Professional Fees, Current Other payables Accounts Payable, Other, Current Total accounts payable and accrued liabilities Concentration Risk, Percentage Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract] Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract] Cash and Cash Equivalents, at Carrying Value Fair Value Measurements Fair Value Disclosures [Text Block] Share-Based Compensation Disclosure of Compensation Related Costs, Share-based Payments [Text Block] Summary of income (Loss) from continuing operations before taxes Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block] Summary of consolidated income tax provision (benefit) Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] Reconciliations of income taxes computed using the U.S. Federal statutory rate to the effective income tax rates Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] Tax effects of temporary differences representing the net deferred tax asset (liability) Schedule of Deferred Tax Assets and Liabilities [Table Text Block] Share-based Compensation Share-based Compensation, Option and Incentive Plans 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] Revenue Recognition Accounts Receivable 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] Credit Risk Due To Certain Concentrations Concentration Risk, Credit Risk, 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] Price-Risk Management Activities Derivatives and Fair Value [Text Block] Schedule of Long-term Debt Instruments [Table] Schedule of Long-term Debt Instruments [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] 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] Debt Instrument [Line Items] Debt Instrument [Line Items] Derivative Asset Derivative Asset Derivative Liability Derivative Liability Provision (Benefit) for Income Taxes Income Tax Disclosure [Text Block] Second Lien Notes [Member] Second Lien Notes [Member] Second Lien Notes [Member] Line of Credit [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] Bank Borrowings Line of Credit Facility [Abstract] Debt Issuance Costs, Net Debt Issuance Costs, Net Long-Term Debt, excluding current maturities Line of Credit, current borrowing base 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. Additional interest in the event of default Additional interest in the event of default Additional interest in the event of default Debt instrument escalating rates for eurodollar rate loans Debt Instrument Escalating Rates for Eurodollar Rate Loans debt instrument escalating rates for Eurodollar rate loans. Line of Credit Facility, Commitment Fee Percentage 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 Interest expense including commitment fees and amortization of debt issuance costs relating to the credit facility 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 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 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 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 Long-term Debt 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 and abandoned wells Asset Retirement Obligation, Liabilities Settled Asset Retirement Obligation, Liabilities Plugged Asset Retirement Obligation, Liabilities Plugged Asset Retirement Obligation, Liabilities Plugged Revisions in estimates Asset Retirement Obligation, Revision of Estimate Disaggregation of Revenue [Table] Disaggregation of Revenue [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] Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] Oil, natural gas and NGL sales