Document and Entity Information Statement [Table] Statement [Line Items] Statement Entity Registrant Name Entity Central Index Key Document Type Document Period End Date Amendment Flag Current Fiscal Year End Date Entity Current Reporting Status Entity Filer Category Entity Common Stock, Shares Outstanding Document Fiscal Year Focus Document Fiscal Period Focus Condensed Consolidated Balance Sheets Assets [Abstract] Assets Assets, Current [Abstract] Current assets: Cash and Cash Equivalents, at Carrying Value Cash and cash equivalents at end of period Cash and cash equivalents at beginning of period Cash and cash equivalents Receivables, Net, Current [Abstract] Accounts receivable: Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for trade receivables that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection. Accounts Receivable Trade Net, Current Trade, net of allowance Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for oil and gas sales receivables that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection. Accounts Receivable, Oil and Gas Sales, Net, Current Oil and gas sales, net of allowance Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for gas gathering, processing and marketing receivables that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection. Accounts Receivable, Gas Gathering, Processing and Marketing, Net, Current Gas gathering, processing, and marketing, net of allowance Other Receivables Other Carrying amount (lower of cost or market) as of the balance sheet date of oil and gas well equipment and supplies less valuation and other allowances. Oil and Gas Well Equipment and Supplies Oil and gas well equipment and supplies Derivative instruments — assets Total gross amounts presented in accompanying balance sheet Derivative instruments Prepaid Expense, Current Prepaid expenses Other Assets, Current Other current assets Assets, Current Total current assets Oil and Gas Property [Abstract] Oil and gas properties at cost, using the full cost method of accounting: Oil and Gas Properties Capitalized Costs, Proved Properties Proved properties Capitalized Costs of Unproved Properties Excluded from Amortization, Cumulative Unproved properties and properties under development, not being amortized Oil and Gas Property, Full Cost Method, Gross Gross oil and gas properties Capitalized Costs, Accumulated Depreciation, Depletion, Amortization and Valuation Allowance Relating to Oil and Gas Producing Activities Less - accumulated depreciation, depletion, amortization and impairment Oil and Gas Property, Full Cost Method, Net Net oil and gas properties Property, Plant and Equipment, Net Fixed assets, net of accumulated depreciation of $257,561 and $246,901, respectively Goodwill Goodwill Derivative Instruments and Hedges, Noncurrent Derivative instruments Deferred Income Taxes and Other Assets, Noncurrent Deferred income taxes Other Assets, Noncurrent Other assets, net Assets Total assets Liabilities and Equity [Abstract] Liabilities and Stockholders' Equity Liabilities, Current [Abstract] Current liabilities: Accounts Payable, Current [Abstract] Accounts payable: Accounts Payable, Trade, Current Trade Carrying value as of the balance sheet date of obligations incurred and payable to third parties for gas gathering, processing and marketing. Accounts Payable, Gas Gathering, Processing and Marketing Gas gathering, processing, and marketing Accrued Liabilities, Current [Abstract] Accrued liabilities: Carrying value as of the balance sheet date of obligations incurred and payable, pertaining to costs for the exploration and development of oil and gas properties. Accrued Liabilities, Exploration and Development Exploration and development All taxes other than income taxes, mainly production severance taxes and ad valorem taxes as of the balance sheet date. Tax, Other than Income Taxes other than income Other Accrued Liabilities, Current Other Derivative Liability, Fair Value, Gross Liability Derivative instruments — liabilities Total gross amounts presented in accompanying balance sheet Derivative instruments Revenue payable for the working interest and royalty interests not distributed. Used to reflect the current portion of the liabilities. Revenue Payable, Current Revenue payable Liabilities, Current Total current liabilities Long-term Debt, Excluding Current Maturities [Abstract] Long-term debt: Long-term Debt, Gross Principal Unamortized Debt Issuance Expense Less - unamortized debt issuance costs Unamortized debt issuance costs Long-term Debt, Excluding Current Maturities Long-term debt, net Deferred Tax Liabilities, Net, Noncurrent Deferred income taxes Asset Retirement Obligations, Noncurrent Asset retirement obligation Long-term asset retirement obligation Derivative Instruments and Hedges, Liabilities, Noncurrent Derivative instruments Other Liabilities, Noncurrent Other liabilities Liabilities Total liabilities Commitments and Contingencies. Commitments and contingencies (Note 10) Stockholders' Equity Attributable to Parent [Abstract] Stockholders' equity: Preferred Stock, Value, Issued Preferred stock, $0.01 par value, 15,000,000 shares authorized, no shares issued Common Stock, Value, Issued Common stock, $0.01 par value, 200,000,000 shares authorized, 95,116,764 and 95,123,525 shares issued, respectively Additional Paid in Capital Additional paid-in capital Retained Earnings (Accumulated Deficit) Retained earnings (Accumulated deficit) Accumulated Other Comprehensive Income (Loss), Net of Tax Accumulated other comprehensive income Stockholders' Equity Attributable to Parent Balance Balance Total stockholders' equity Liabilities and Equity Total liabilities and stockholders' equity Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Fixed assets, accumulated depreciation (in dollars) Preferred Stock, Par or Stated Value Per Share Preferred stock, par value (in dollars per share) Preferred Stock, Shares Authorized Preferred stock, shares authorized Preferred Stock, Shares Issued Preferred stock, shares issued Common Stock, Par or Stated Value Per Share Common stock, par value (in dollars per share) Common Stock, Shares Authorized Common stock, shares authorized Common Stock, Shares, Issued Common stock, shares issued Consolidated Statements of Operations and Comprehensive Income (Loss) Oil and Gas Revenue [Abstract] Revenues: Oil and Condensate Revenue Oil sales Natural Gas Production Revenue Gas sales Revenue from the sale of natural gas liquids (NGL). Natural gas liquids are found with natural gas and usually are composed of ethane, propane, natural gasoline, butane, and isobutene. NGL should not be confused with natural gas, which is composed primarily of methane. Also, NGL is not liquefied natural gas, which is condensed natural gas that is primarily used for overseas shipping. NGL Sales Revenue NGL sales The total of natural gas midstream revenue and other revenue. Natural gas midstream revenue refers to those gas industry activities that fall between exploration and production (upstream) and refining and marketing (downstream). It may be applied to the gathering, processing, transmission and storage of natural gas; including the treating of natural gas to remove impurities, along with the sale of by-products such as residue gas, natural gas liquids and condensate. Other revenue includes those operating revenues not specified elsewhere, including non-hydrocarbons. Gas Gathering, Processing and Other Revenue Gas gathering and other Revenue related to marketing of natural gas and related products, net of related costs. Gas Marketing Revenue, Net of Related Costs Gas marketing, net of related costs of $39,853 and $25,312 respectively Revenues Total revenues Costs and Expenses [Abstract] Costs and expenses: Results of Operations, Impairment of Oil and Gas Properties Impairment of oil and gas properties Impairments and other valuation losses Results of Operations, Depreciation, Depletion and Amortization, and Valuation Provisions Depreciation, depletion and amortization Accretion Expense, Including Asset Retirement Obligations Asset retirement obligation Results of Operations, Production or Lifting Costs Production Includes the cost to prepare, process and move liquid hydrocarbons and natural gas to their points of sale. Transportation Processing And Other Operating Costs Transportation, processing and other operating The total of natural gas midstream costs. Natural gas midstream costs refers to those gas industry activities that fall between exploration and production (upstream) and refining and marketing (downstream). It may be applied to the gathering, processing, transmission and storage of natural gas; including the treating of natural gas to remove impurities. Gas Gathering and Processing Costs Gas gathering and other All taxes other than income taxes, mainly production severance taxes and ad valorem taxes. Taxes, Other than Income Taxes other than income General and Administrative Expense General and administrative Share-based Compensation Stock compensation Compensation expense Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net (Gain) loss on derivative instruments, net (Gain) loss on derivative instruments Gain on derivative instruments, net Other Operating Income (Expense), Net Other operating, net Costs and Expenses Total costs and expenses Operating Income (Loss) Operating income (loss) Nonoperating Income (Expense) [Abstract] Other (income) and expense: Interest Costs Incurred Interest expense Interest Costs Capitalized Adjustment Capitalized interest Other Nonoperating Income (Expense) Other, net Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest Income (loss) before income tax Income Tax Expense (Benefit) Income tax expense (benefit) Total income tax expense (benefits) Net Income (Loss) Attributable to Parent Net income Net income (loss) Net income (loss) Earnings (Loss) per Share Earnings (loss) per share to common stockholders: Earnings Per Share, Basic Basic (in dollars per share) Earnings Per Share, Diluted Diluted (in dollars per share) Common Stock, Dividends, Per Share, Declared Dividends declared (in dollars per share) Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract] Comprehensive income (loss): Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract] Other comprehensive income: Appreciation or loss in value of the total of unsold investments during the period being reported on, net of tax. Other Comprehensive Income, Unrealized Gain (Loss) in Fair Value of Investments, Net of Tax Change in fair value of investments, net of tax of $231 and $49, respectively Unrealized change in fair value of investments, net of tax Comprehensive Income (Loss), Net of Tax, Attributable to Parent Total comprehensive income (loss) Costs related to marketing of natural gas and related products. Gas Marketing, Related Costs Gas marketing, related costs Other Comprehensive Income Unrealized Gain Loss In Fair Value Of Investments Tax Other Comprehensive Income Unrealized Gain Loss In Fair Value Of Investments Tax Change in fair value investments, tax Condensed Consolidated Statements of Cash Flows Net Cash Provided by (Used in) Operating Activities, Continuing Operations [Abstract] Cash flows from operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Adjustments to reconcile net income (loss) to net cash provided by operating activities: Deferred Income Tax Expense (Benefit) Deferred tax expense (benefit) The excess or shortfall of realized amounts versus previously recorded fair value upon settlement of derivative instruments. Realized Gain (Loss) on Settlement of Derivative Instruments Settlements on derivative instruments Cash payments (receipts) on derivative instruments, net Increase (Decrease) in Other Operating Assets and Liabilities, Net Changes in non-current assets and liabilities Other Noncash Income (Expense) Other, net Increase (Decrease) in Operating Capital [Abstract] Changes in operating assets and liabilities: Increase (Decrease) in Receivables Receivables Increase (Decrease) in Other Operating Assets Other current assets Increase (Decrease) in Accounts Payable and Accrued Liabilities Accounts payable and other current liabilities Net Cash Provided by (Used in) Operating Activities, Continuing Operations Net cash provided by operating activities Net cash provided by operating activities Net Cash Provided by (Used in) Investing Activities, Continuing Operations [Abstract] Cash flows from investing activities: Payments to Explore and Develop Oil and Gas Properties Oil and gas expenditures Proceeds from Sale of Oil and Gas Property and Equipment Sales of oil and gas assets Proceeds from Sale of Other Productive Assets Sales of other assets Payments for (Proceeds from) Other Investing Activities Other capital expenditures Net Cash Provided by (Used in) Investing Activities, Continuing Operations Net cash used by investing activities Net Cash Provided by (Used in) Financing Activities, Continuing Operations [Abstract] Cash flows from financing activities: Payments of Ordinary Dividends, Common Stock Dividends paid Payments Related to Tax Withholding for Share-based Compensation Employee withholding taxes paid when directly withholding shares on vested stock awards Proceeds From Stock Options Exercised And Other Financing Cash Flows Proceeds From Stock Options Exercised And Other Financing Cash Flows Proceeds from exercise of stock options and other Net Cash Provided by (Used in) Financing Activities, Continuing Operations Net cash (used) provided by financing activities Net cash used by financing activities Net Cash Provided by (Used in) Continuing Operations Net change in cash and cash equivalents CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Common Stock [Member] Common Stock [Member] Additional Paid In Capital [Member] Additional Paid-in Capital [Member] Retained Earnings [Member] Retained Earnings [Member] Accumulated Other Comprehensive Income [Member] Accumulated Other Comprehensive Income (Loss) [Member] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity Shares, Issued Balance, shares Balance, shares Dividends, Common Stock, Cash Dividends Adjustments to Additional Paid in Capital, Dividends in Excess of Retained Earnings Dividends in Excess of Retained Earnings Dividend declared from APIC Stock Issued During Period, Value, Restricted Stock Award, Gross Issuance of restricted stock awards Stock Issued During Period, Shares, Restricted Stock Award, Gross Issuance of restricted stock awards, shares Stock Repurchased and Retired During Period, Value Common stock reacquired and retired Stock Repurchased and Retired During Period, Shares Common stock reacquired and retired, shares Value of stock related to restricted stock awards forfeited and retired during the period. Stock Issued During Period, Value, Restricted Stock Award, Forfeited and Retired Restricted stock forfeited and retired Stock Issued During Period, Shares, Restricted Stock Award, Forfeited and Retired Restricted stock forfeited and retired, shares Stock Issued During Period, Value, Stock Options Exercised Exercise of stock options Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Exercise of stock options, shares Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition Stock-based compensation Amount after tax of cumulative effect adjustment on equity or net assets for prospective application of a new accounting principle. Cumulative Effect Of Prospective Application Of New Accounting Principle Net Of Tax 1 Cumulative effect adjustment of adopting ASU 2016-09 Stockholders' Equity, Other Other BASIS OF PRESENTATION Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] BASIS OF PRESENTATION Long-term debt Long-term Debt [Text Block] LONG-TERM DEBT Derivative instruments/hedging Derivative Instruments and Hedging Activities Disclosure [Text Block] DERIVATIVE INSTRUMENTS/HEDGING Fair Value Measurements Fair Value Disclosures [Text Block] FAIR VALUE MEASUREMENTS Capital Stock Stockholders' Equity Note Disclosure [Text Block] CAPITAL STOCK Stock-based Compensation Disclosure of Compensation Related Costs, Share-based Payments [Text Block] STOCK-BASED COMPENSATION Asset Retirement Obligations Asset Retirement Obligation Disclosure [Text Block] ASSET RETIREMENT OBLIGATIONS Earnings Per Share [Text Block] EARNINGS (LOSS) PER SHARE Income Taxes Income Tax Disclosure [Text Block] INCOME TAXES Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] COMMITMENTS AND CONTINGENCIES Supplemental Disclosure of Cash Flow Information: Cash Flow, Supplemental Disclosures [Text Block] SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION Basis of Accounting, Policy [Policy Text Block] Basis of presentation Use of Estimates, Policy [Policy Text Block] Use of Estimates Industry Specific Policies, Oil and Gas [Policy Text Block] Oil and Gas Properties New Accounting Pronouncements, Policy [Policy Text Block] Recently Issued Accounting Standards Schedule of Long-term Debt Instruments [Table Text Block] Summary of debt Derivative [Table] Derivative [Line Items] Derivative Schedule of Derivative Instruments [Table Text Block] Outstanding hedging contracts relative to future production Derivative Instruments, Gain (Loss) [Table Text Block] Net (gains) and losses from settlements and changes of derivative contracts Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block] Schedule of amounts and classifications of entity's derivative assets and liabilities as well as the potential effect of netting arrangements on contracts with the same counterparty Fair Value, by Balance Sheet Grouping [Table Text Block] Fair value measurement information for certain assets and liabilities Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Options, Restricted Stock and Unit Awards This element represents the share-based compensation cost expensed during the period or capitalized as a part of the cost of oil and gas properties. Share Based Compensation Arrangement by Share Based Payment Award, Compensation Cost Disclosure [Table Text Block] Recognition of non-cash stock-based compensation cost Schedule of Asset Retirement Obligations [Table Text Block] Change in the carrying amount of the asset retirement obligation Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Calculations of basic and diluted net earnings (loss) per common share under the two-class method Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] Components of the provision for income taxes Schedule of Cash Flow, Supplemental Disclosures [Table Text Block] Supplemental Disclosure of Cash Flow Information Impairment On Oil And Gas Well Equipment And Supplies Impairment On Oil And Gas Well Equipment And Supplies The discount rate used to calculate the present value of estimated future net revenues from proved reserves. Present Value of Estimated Future Net Revenues from Proved Reserves, Discount Rate Discount rate for calculating present value of estimated future net revenues from proved reserves (as a percent) Costs, after tax, related to the impairment of oil and gas properties. Results of Operations Impairment of Oil and Gas Properties After Tax Impairment of oil and gas properties, after tax Schedule of Long-term Debt Instruments [Table] Debt Instrument [Axis] Debt Instrument Name [Domain] Debt Instrument, Name [Domain] Represents the 5.875% notes due may 1, 2022 of the entity. Notes5.875 Percent [Member] Senior Notes 5.875% [Member] Represents the 4.375 notes due June 1, 2024 of the entity. Notes4375 [Member] Senior Notes 4.375% [Member] Debt Instrument [Line Items] Debt Instrument Debt Instrument, Interest Rate, Stated Percentage Interest rate (as a percent) Variable Rate [Axis] Variable Rate [Domain] Variable Rate [Domain] London Interbank Offered Rate L I B O R [Member] London Interbank Offered Rate (LIBOR) [Member] Senior Unsecured Notes 3.90 Percent [Member] Senior Unsecured Notes3.90 Percent [Member] Senior Unsecured Notes 3.90% [Member] Range [Axis] Range [Member] Range [Domain] Minimum [Member] Minimum [Member] Maximum [Member] Maximum [Member] Long-term Line of Credit Borrowings outstanding Line of Credit Facility, Current Borrowing Capacity Credit facility amount Line of Credit Facility, Maximum Borrowing Capacity Credit facility, increase amount option Letters of Credit Outstanding, Amount Letters of credit outstanding under the credit facility Line of Credit Facility, Remaining Borrowing Capacity Unused borrowing availability Debt Instrument, Basis Spread on Variable Rate Interest rate margin (as a percent) Line of Credit Facility, Unused Capacity, Commitment Fee Percentage Commitment fee percentage Debt To Capital Ratio Debt To Capital Ratio Debt-to-Capital ratio Debt Instrument, Interest Rate, Effective Percentage Effective rate Settled Tendered Notes Including Accrued Interest Settled Tendered Notes Including Accrued Interest Settled tendered notes including accrued interest Debt Instrument, Face Amount Principal amount Debt instrument issuance price, percentage of par value. Debt Instrument Issuance Price, Percentage of Par Value Debt instrument issuance price, at par percentage Proceeds from Issuance of Unsecured Debt Represents the estimated offering cost. Estimated Offering costs Estimated offering cost Represents the tender price for each $1000 of the debt instrument's principal amount. Debt Instrument Tender Price Per Principal Amount Tender price of debt instrument for each $1000 principal amount Represents the principal amount (as the denominator) used to state the tender price of the debt instrument. Debt Instrument Tender Price Principal Amount Denominator Principal amount used for ratio of debt instrument tender price Represents the redemption price for each $1000 of the debt instrument's principal amount. Debt Instrument, Redemption Price, Per Principal Amount Redemption price of debt instrument for each $1000 principal amount Represents the principal amount (as the denominator) used to state the redemption price of the debt instrument. Debt Instrument, Redemption Price, Principal Amount Denominator Principal amount used for ratio of debt instrument redemption price Derivative Instrument [Axis] Derivative Contract Type [Domain] Derivative Contract [Domain] This element represents the oil collar agreements using the West Texas Intermediate ("WTI") index for derivative contracts. Derivative Contract Oil Collar W T I Index [Member] Derivative Contract Oil Collar W T I Index [Member] Represents the gas collar agreements using the Panhandle Eastern Pipe Line (PEPL) index for derivative contracts. Derivative Contract Gas Collar P E P L Index [Member] Derivative Contract Gas Collar PEPL Index [Member] Represents the gas collar agreements using the El Paso Natural Gas Company, Permian Basin Index (Perm EP) index for derivative contracts. Derivative Contract Gas Collar Perm E P [Member] Derivative Contract Gas Collar Perm EP [Member] Information by period of derivative contract. Derivative Contract by Period [Axis] The period of derivative contract entered into by the entity. Derivative Contract By Period [Domain] Derivative Contract by Period [Domain] Year 1 [Member] Year1 [Member] 2017 [Member] Quarter 2 Year 1 [Member] Quarter2 Year1 [Member] Second Quarter - 2017 [Member] Quarter 3 Year 1 [Member] Quarter3 Year1 [Member] Third Quarter - 2017 [Member] Quarter 4 Year 1 [Member] Quarter4 Year1 [Member] Fourth Quarter - 2017 [Member] Year 2 [Member] Year2 [Member] 2018 [Member] Quarter 1 Year 2 [Member] Quarter1 Year2 [Member] First Quarter - 2018 [Member] Quarter 2 Year 2 [Member] Quarter2 Year2 [Member] Second Quarter - 2018 [Member] Percent Of Oil And Natural Gas Production Available For Hedging Percent Of Oil And Natural Gas Production Available For Hedging Percent of oil and gas production available for hedging Derivative, Fair Value, Net [Abstract] Fair values of derivative assets and liabilities Derivative, Nonmonetary Notional Amount Volume Weighted Average Price [Abstract] Weighted Average Price Derivative, Average Floor Price Floor, weighted average price (in dollars per unit) Derivative, Average Cap Price Ceiling, weighted average price (in dollars per unit) Derivative Instruments, Gain (Loss) [Table] Derivative Instruments, Gain (Loss) [Line Items] Net (gains) and losses on derivative contracts Change In Fair Value Of Derivative Instruments Net Change In Fair Value Of Derivative Instruments Net Change in fair value of derivative instruments, net Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Hedging Designation [Axis] Hedging Designation [Domain] Hedging Designation [Domain] Nondesignated [Member] Not Designated as Hedging Instrument [Member] Derivative instrument whose primary underlying risk is tied to oil prices. Oil Contracts [Member] Oil Contracts [Member] Derivative instrument whose primary underlying risk is tied to natural gas prices. Natural Gas Contracts [Member] Natural Gas Contracts [Member] Balance Sheet Location [Axis] Balance Sheet Location [Domain] Balance Sheet Location [Domain] Other Current Assets [Member] Current Assets [Member] Other Noncurrent Assets [Member] Non-Current Assets [Member] Other Current Liabilities [Member] Current Liabilities [Member] Derivatives, Fair Value [Line Items] Derivatives, Fair Value Derivative Asset, Fair Value, Amount Not Offset Against Collateral [Abstract] Asset Derivative Liability, Fair Value, Gross Asset Less: gross amounts not offset in the accompanying balance sheet Derivative Asset Net amount: Derivative Liability, Fair Value, Amount Not Offset Against Collateral [Abstract] Liability Derivative Asset, Fair Value, Gross Liability Less: gross amounts not offset in the accompanying balance sheet Derivative Liability Net amount: Fair Value, by Balance Sheet Grouping [Table] Fair Value, Hierarchy [Axis] Fair Value Measurements Fair Value Hierarchy [Domain] Fair Value Hierarchy [Domain] Fair Value Inputs Level1 [Member] Fair Value, Inputs, Level 1 [Member] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Financial Assets (Liabilities): Long-term Debt, Fair Value Long-term debt Valuation and Qualifying Accounts Disclosure [Table] Valuation Allowances and Reserves Type [Axis] Valuation Allowances And Reserves [Domain] Valuation Allowances and Reserves [Domain] Allowance For Trade Receivables [Member] Allowance for Trade Receivables [Member] Valuation and Qualifying Accounts Disclosure [Line Items] Other Financial Instruments Allowance for Doubtful Accounts Receivable, Current Aggregate allowance for doubtful accounts Bank Overdrafts Liabilities representing checks issued but not yet presented for payment Interest Payable Accrued interest Employee-related Liabilities, Current Accrued payroll related general and administrative expenses Accrued Operating Expenses Accrued Operating Expenses Accrued operating expenses Common Stock, Shares, Outstanding Common stock outstanding (in shares) Preferred Stock, Shares Outstanding Preferred stock outstanding (in shares) Dividends [Abstract] Dividends Interest and Dividends Payable [Abstract] Dividend payable Award Type [Axis] Share Based Compensation Arrangements By Share Based Payment Award Award Type And Plan Name [Domain] Equity Award [Domain] Incremental common shares attributable to unvested restricted stock and units. Restricted stock are shares of stock for which sale is contractually or governmentally restricted for a given period of time. A restricted stock unit represents a right to an unrestricted share of common stock upon completion of defined vesting and holding periods. Restricted Stock And Units [Member] Restricted Stock and Units [Member] Restricted Stock [Member] Restricted Stock [Member] Incremental common shares attributable to unvested restricted stock issued to certain executive officers and are subject to market condition-based vesting determined by the entity's stock price performance relative to a defined peer group's stock price performance. Restricted stock are shares of stock for which sale is contractually or governmentally restricted for a given period of time. Performance Based Restricted Stock [Member] Performance Based Restricted Stock [Member] Incremental common shares attributable to unvested restricted stock other than shares issued to certain executive officers, having service-based vesting schedules. Restricted stock are shares of stock for which sale is contractually or governmentally restricted for a given period of time. Service Based Restricted Stock [Member] Service Based Restricted Stock [Member] Employee Stock Option [Member] Employee Stock Option [Member] Allocated Share-based Compensation Expense Compensation cost before capitalized cost Employee Service Share-based Compensation, Allocation of Recognized Period Costs, Capitalized Amount Less amounts capitalized to oil and gas properties Property, Plant and Equipment [Table] Property, Plant and Equipment [Line Items] Properties Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] Asset Retirement Obligations Asset Retirement Obligation Balance at beginning of year Balance at end of year Asset Retirement Obligation, Liabilities Incurred Liabilities incurred Asset Retirement Obligation, Liabilities Settled Liability settlements and disposals Asset Retirement Obligation, Accretion Expense Accretion expense Asset Retirement Obligation, Revision of Estimate Revisions of estimated liabilities Asset Retirement Obligation, Current Less current obligation Net Income (Loss) Available to Common Stockholders, Basic [Abstract] Basic: This element represents the allocation of undistributed earnings to shareholders. Basic Allocation of Undistributed Earnings Participating securities' share in earnings (in dollars) Net Income (Loss) Available to Common Stockholders, Basic Net income (loss) applicable to common stockholders Net Income (Loss) Available to Common Stockholders, Diluted [Abstract] Diluted: This element represents the allocation of undistributed earnings to unrestricted common shareholders including dilutive potential shares. Diluted Allocation of Undistributed Earnings Participating securities' share in earnings (in dollars) Net Income (Loss) Available to Common Stockholders, Diluted Net income (loss) applicable to common stockholders Earnings Per Share, Diluted Shares [Abstract] Shares: Weighted Average Number of Shares Outstanding, Basic Basic shares outstanding Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements Dilutive effect of stock options Weighted Average Number of Shares Outstanding, Diluted Fully diluted common stock (in shares) Earnings Per Share, Basic and Diluted [Abstract] Earnings per share to common shareholders Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Excluded antidilutive securities (in shares) Components of Income Tax Expense (Benefit), Continuing Operations [Abstract] Components of provision for income taxes: Income Tax Expense (Benefit), Continuing Operations [Abstract] Income Tax Expense (Benefit) Current Income Tax Expense (Benefit) Current tax benefit Effective Income Tax Rate Reconciliation, Percent Combined federal and state effective income tax rate Operating Loss Carryforwards [Table] Operating Loss Carryforwards [Line Items] Deferred Tax Assets, Operating Loss Carryforwards, Domestic U.S. net tax operating loss carryforward Deferred Tax Assets, Tax Credit Carryforwards, Alternative Minimum Tax Alternative minimum tax credit carryforward Unrecognized Tax Benefits that Would Impact Effective Tax Rate Unrecognized tax benefits that would impact the entity's effective rate Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued Provisions for interest or penalties related to uncertain tax positions Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent U.S. statutory rate (as a percent) Long-term Purchase Commitment [Table] Category of Item Purchased [Axis] Long Term Purchase Commitment Category Of Item Purchased [Domain] Long-term Purchase Commitment, Category of Item Purchased [Domain] Drilling commitments relating to the obligation to complete drilling wells in progress. Drilling Commitments [Member] Drilling Commitments [Member] Gathering System Construction [Member] Gathering System Construction [Member] Gathering System Construction [Member] Unrecorded Unconditional Purchase Obligation [Line Items] Construction, Drilling and Purchase Commitments Long-term Purchase Commitment, Amount Commitments for purchases and other expenditures Oil and Gas Delivery Commitments and Contracts [Table] Oil and Gas Delivery Commitments and Contracts [Axis] Oil And Gas Delivery Commitments And Contracts Oil Producing Property [Domain] Oil and Gas Delivery Commitments and Contracts, Oil Producing Property [Domain] This element represents sales contracts related to the transmission of natural gas to customers. Natural Gas Sales Contracts [Member] Natural Gas Sales Contracts [Member] Gas Gathering And Processing Agreements [Member] Gas Gathering And Processing Agreements [Member] Gas Gathering And Processing Agreements [Member] Minimum Volume Agreement [Member] Minimum Volume Agreement [Member] Minimum Volume Agreement [Member] Represents the other transportation, delivery commitments and facilities commitments. Other Transportation And Delivery Commitments And Facilities Commitments [Member] Other Transportation, Delivery And Facilities Commitments [Member] Oil and Gas Delivery Commitments and Contracts [Line Items] Delivery Commitments Oil and Gas Delivery Commitments and Contracts, Remaining Contractual Volume Volume of gas deliverable (in Bcf) This element represents the period for delivery of oil and gas under terms of contracts and agreements in effect at balance sheet date. Oil and Gas Delivery Commitments and Contracts, Period Delivery term Total financial obligation resulting from inability to meet short-term or long-term contractual delivery obligations. Maximum Financial Commitment Resulting from Inability to Meet Gas Delivery Commitments Financial commitment upon nondelivery Accrued Liabilities, Current Accrued liabilities Leases, Operating [Abstract] Non-cancelable operating leases Operating Leases, Future Minimum Payments Due Future minimum operating lease arrangements Supplemental Cash Flow Information [Abstract] Cash paid during the period for: Interest Paid, Net Interest expense (net of capitalized amounts of $303 and $140, respectively) Income Taxes Paid Income taxes Proceeds from Income Tax Refunds Cash received for income tax refunds Interest Paid, Capitalized Interest capitalized Base Rate [Member] Base Rate [Member] Revolving Credit Facility [Member] Revolving Credit Facility [Member] Subsequent Event Type [Axis] Subsequent Event Type [Domain] Subsequent Event Type [Domain] Subsequent Event [Member] Subsequent Events Other Noncurrent Liabilities [Member] Non-Current Liabilities [Member] Measurement Basis [Axis] Portion At Fair Value Fair Value Disclosure [Member] Portion at Fair Value Measurement [Member] Carrying Reported Amount Fair Value Disclosure [Member] Carrying Amount [Member] Estimate Of Fair Value Fair Value Disclosure [Member] Fair Value [Member] Adjustments for Change in Accounting Principle [Axis] Change In Accounting Principle [Member] Adjustments for Change in Accounting Principle [Domain] Accounting Standards Update 2016 09 [Member] Accounting Standards Update201609 [Member] Accounting Standards Update 2016 09 [Member]