CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Operating activities:
Net income (loss)	$ (479,588,000)	$ (750,178,000)
Adjustments to reconcile net income (loss) to net cash provided from operating activities:
Deferred income tax (benefit) expense	(35,477,000)	(29,411,000)
Depletion, depreciation and amortization and impairment of proved properties	272,128,000	382,734,000
Abandonment and impairment of unproved properties	7,206,000	16,604,000
Derivative fair value loss (income)	959,782,000	(102,182,000)
Cash settlements on derivative financial instruments	(239,165,000)	305,243,000
Divestiture contract obligation accretion, net of gain	8,467,000	486,689,000
Allowance for bad debt	0	400,000
Amortization of deferred financing costs and other	6,253,000	5,023,000
Deferred and stock-based compensation	119,946,000	38,380,000
Gain on the sale of assets	(724,000)	(112,443,000)
Loss (gain) on early extinguishment of debt	98,000	(14,093,000)
Changes in working capital:
Accounts receivable	(116,204,000)	91,343,000
Other current assets	(3,574,000)	(5,786,000)
Accounts payable	34,313,000	(52,820,000)
Accrued liabilities and other	(58,172,000)	(80,529,000)
Net cash provided from operating activities	475,289,000	178,974,000
Investing activities:
Additions to natural gas properties	(311,709,000)	(321,849,000)
Additions to field service assets	(720,000)	(2,493,000)
Acreage purchases	(20,302,000)	(18,554,000)
Proceeds from disposal of assets	237,000	246,083,000
Purchases of marketable securities held by the deferred compensation plan	(24,396,000)	(14,855,000)
Proceeds from the sales of marketable securities held by the deferred compensation plan	27,974,000	20,974,000
Net cash used in investing activities	(328,916,000)	(90,694,000)
Financing activities:
Borrowings on credit facilities	1,250,000,000	1,676,000,000
Repayments on credit facilities	(1,922,000,000)	(1,447,000,000)
Issuance of senior notes	600,000,000	850,000,000
Repayment of senior or senior subordinated notes	(63,324,000)	(1,120,634,000)
Treasury stock purchases	0	(22,992,000)
Debt issuance costs	(8,799,000)	(12,735,000)
Taxes paid for shares withheld	(9,267,000)	(2,841,000)
Change in cash overdrafts	1,515,000	(8,797,000)
Proceeds from the sales of common stock held by the deferred compensation plan	5,522,000	690,000
Net cash (used in) provided from financing activities	(146,353,000)	(88,309,000)
Increase in cash and cash equivalents	20,000	(29,000)
Cash and cash equivalents at beginning of period	458,000	546,000
Cash and cash equivalents at end of period	$ 478,000	$ 517,000