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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Operating activities:      
Net loss $ (711,777,000) $ (1,716,297,000) $ (1,746,481,000)
Adjustments to reconcile net loss to net cash provided from operating activities      
Deferred income tax benefit (25,029,000) (506,438,000) (30,489,000)
Depletion, depreciation and amortization and impairment of proved properties 473,285,000 1,644,477,000 658,081,000
Impairment of goodwill 0 0 1,641,197,000
Exploration dry hole costs 888,000 (11,000) 4,000
Abandonment and impairment of unproved properties 19,334,000 1,235,342,000 514,994,000
Derivative fair value (income) loss (187,711,000) (226,681,000) 51,192,000
Cash settlements on derivative financial instruments 322,629,000 188,384,000 (131,522,000)
Divestiture contract obligation 499,934,000 0 0
Allowance for bad debt 400,000 4,341,000 (1,000,000)
Amortization of deferred financing costs and other 6,919,000 6,455,000 2,515,000
Deferred and stock-based compensation 48,552,000 24,891,000 29,757,000
(Gain) loss on the sale of assets (110,791,000) 30,256,000 10,666,000
Gain on early extinguishment of debt (14,068,000) (5,415,000) 0
Changes in working capital:      
Accounts receivable 24,539,000 214,196,000 (142,381,000)
Inventory and other 1,010,000 4,520,000 138,000
Accounts payable (32,686,000) (60,374,000) (4,274,000)
Accrued liabilities and other (46,748,000) (155,803,000) 138,293,000
Net cash provided from operating activities 268,680,000 681,843,000 990,690,000
Investing activities:      
Additions to natural gas and oil properties (405,617,000) (687,277,000) (960,916,000)
Additions to field service assets (2,873,000) (1,162,000) (1,477,000)
Acreage purchases (26,816,000) (59,986,000) (60,603,000)
Proceeds from disposal of assets 246,127,000 784,937,000 324,549,000
Purchases of marketable securities held by the deferred compensation plan (17,076,000) (19,039,000) (46,177,000)
Proceeds from the sales of marketable securities held by the deferred compensation plan 22,173,000 22,005,000 49,190,000
Net cash (used in) provided from investing activities (184,082,000) 39,478,000 (695,434,000)
Financing activities:      
Borrowings on credit facilities 2,076,000,000 2,311,000,000 2,070,000,000
Repayments on credit facilities (1,851,000,000) (2,777,000,000) (2,338,000,000)
Issuance of senior notes 850,000,000 0 0
Repayment of senior or senior subordinated notes (1,120,634,000) (195,432,000) 0
Dividends paid 0 (20,070,000) (19,940,000)
Treasury stock purchases (22,992,000) (6,908,000) 0
Debt issuance costs (13,608,000) (4,446,000) (8,220,000)
Taxes paid for shares withheld (3,324,000) (3,384,000) (3,183,000)
Change in cash overdrafts 176,000 (25,747,000) (5,563,000)
Proceeds from the sales of common stock held by the deferred compensation plan 696,000 667,000 9,747,000
Net cash used in financing activities (84,686,000) (721,320,000) (295,159,000)
(Decrease) increase in cash and cash equivalents (88,000) 1,000 97,000
Cash and cash equivalents at beginning of year 546,000 545,000 448,000
Cash and cash equivalents at end of year $ 458,000 $ 546,000 $ 545,000