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 Well-known Seasoned Issuer Entity Voluntary Filers Entity Current Reporting Status Entity Filer Category Entity Public Float 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 Deferred Tax Assets, Net of Valuation Allowance, Current Deferred income taxes Net deferred tax assets, current, total Derivative Asset, Fair Value, Gross Asset 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 and amortization Oil and Gas Property, Full Cost Method, Net Net oil and gas properties Property, Plant and Equipment, Net Fixed assets, less accumulated depreciation of $175,453 and $167,675 Goodwill Goodwill 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 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 Long-term debt Deferred Tax Liabilities, Net, Noncurrent Deferred income taxes Asset Retirement Obligations, Noncurrent Asset retirement obligation Long-term asset retirement obligation Other Liabilities, Noncurrent Other liabilities Liabilities Total liabilities Stockholders' Equity Attributable to Parent [Abstract] Stockholders' equity: Common Stock, Value, Issued Common stock, $0.01 par value, 200,000,000 shares authorized, 87,592,535 and 87,152,197 shares issued, respectively Additional Paid in Capital Paid-in capital Retained Earnings (Accumulated Deficit) Retained earnings 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 Income and Comprehensive Income Oil and Gas Revenue [Abstract] Revenues: Revenue from the sale of oil and condensate. Oil Sales 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 $256,836, $187,772 and $86,813 respectively Revenues Total revenues Costs and Expenses [Abstract] Costs and expenses: 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 (loss) on derivative instruments, net Other Operating Income (Expense), Net Other operating (income) expense, net Costs and Expenses Total costs and expenses Operating Income (Loss) Operating income Nonoperating Income (Expense) [Abstract] Other (income) and expense: Interest Costs Incurred Interest expense Interest Costs Capitalized Adjustment Capitalized interest Gains (Losses) on Extinguishment of Debt Loss on early extinguishment of debt Other Nonoperating Income (Expense) Other, net Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest Income before income tax Income Tax Expense (Benefit) Income tax expense Total income tax expense (benefits) Net Income (Loss) Attributable to Parent Net income Net income Earnings per Share Earnings per share to common stockholders: Earnings Per Share, Basic [Abstract] Basic Earnings Per Share, Basic, Distributed Distributed (in dollars per share) Earnings Per Share, Basic, Undistributed Undistributed (in dollars per share) Earnings Per Share, Basic Basic (in dollars per share) Total basic (in dollars per share) Earnings Per Share, Diluted [Abstract] Diluted Earnings Per Share, Diluted, Distributed Distributed (in dollars per share) Earnings Per Share, Diluted, Undistributed Undistributed (in dollars per share) Earnings Per Share, Diluted Diluted (in dollars per share) Total diluted (in dollars per share) Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract] Comprehensive income: 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 Unrealized change in fair value of investments, net of tax Comprehensive Income (Loss), Net of Tax, Attributable to Parent Total comprehensive income Costs related to marketing of natural gas and related products. Gas Marketing, Related Costs Gas marketing, related costs 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 to net cash provided by operating activities: Deferred Income Tax Expense (Benefit) Deferred income taxes Deferred taxes 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 Settlement gains (losses) Settlements on derivative instruments 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, net Increase (Decrease) in Other Operating Assets Other current assets Increase (Decrease) in Accounts Payable and Accrued Liabilities Accounts payable and accrued liabilities Net Cash Provided by (Used in) Operating Activities, Continuing Operations 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 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: The net cash inflow (outflow) in aggregate bank debt due to repayments and proceeds from additional borrowings. Proceeds from (Repayments of) Bank Debt Net bank debt borrowings Proceeds from Issuance of Other Long-term Debt Proceeds from other long-term debt Repayments of Other Long-term Debt Other long-term debt payments Payments of Financing Costs Financing costs incurred Payments of Ordinary Dividends, Common Stock Dividends paid Proceeds from Issuance or Sale of Equity Issuance of common stock and other Net Cash Provided by (Used in) Financing Activities, Continuing Operations Net cash provided 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 Dividend declared 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 Exercised (in shares) Exercise of stock options, shares Number of options exercised (in shares) Value of stock issued during the period related to the accelerated vesting of stock options, restricted stock, and restricted stock units. Stock Issued During Period, Value, Accelerated Vesting of Stock Options, Restricted Stock and Restricted Stock Units Vesting of restricted stock units The number of shares issued during the period related to the vesting of restricted stock units. Stock Issued During Period, Shares, Vesting of Restricted Stock Units Vesting of restricted stock units, shares Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition Stock-based compensation Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation Stock-based compensation tax benefit Basis of Presentation Organization, Consolidation and Presentation of Financial Statements Disclosure and Significant Accounting Policies [Text Block] BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Long-Term Debt Long-term Debt [Text Block] Long-Term Debt Property Acquisitions and Sales The disclosure of sales and acquisitions of various interests in oil and gas properties. Property, Sales and Acquisitions Disclosure [Text Block] Property Acquisitions and Sales Fair Value Measurements Fair Value Disclosures [Text Block] Fair Value Measurements Derivative Instruments/Hedging Derivative Instruments and Hedging Activities Disclosure [Text Block] Derivative Instruments/Hedging Capital Stock Stockholders' Equity Note Disclosure [Text Block] Capital Stock STOCK-BASED AND OTHER COMPENSATION Compensation and Employee Benefit Plans [Text Block] Stock-based compensation and other compensation Earnings Per Share [Text Block] Earnings per Share Asset Retirement Obligations Asset Retirement Obligation Disclosure [Text Block] Asset Retirement Obligations Income Taxes Income Tax Disclosure [Text Block] Income Taxes Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Commitments and Contingencies RELATED PARTY TRANSACTIONS Related Party Transactions Disclosure [Text Block] RELATED PARTY TRANSACTIONS 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 Segment Reporting, Policy [Policy Text Block] Segment Information Use of Estimates, Policy [Policy Text Block] Use of Estimates Cash and Cash Equivalents, Policy [Policy Text Block] Cash and Cash Equivalents Industry Specific Policies, Oil and Gas [Policy Text Block] Oil and Gas Properties Property, Plant and Equipment Disclosure [Text Block] Fixed assets, net Goodwill and Intangible Assets, Policy [Policy Text Block] Goodwill