CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Operating activities:
Net (loss) income	$ (1,594,000)	$ 116,604,000
Adjustments to reconcile net (loss) income to net cash provided from
Deferred income tax expense	7,304,000	45,787,000
Depletion, depreciation and amortization and impairment of proved properties	284,612,000	280,223,000
Abandonment and impairment of unproved properties	10,937,000	25,429,000
Derivative fair value income	(226,872,000)	(133,514,000)
Cash settlements on derivative financial instruments	219,429,000	58,341,000
Allowance for bad debt	400,000	0
Amortization of deferred financing costs and other	3,398,000	3,243,000
Deferred and stock-based compensation	23,113,000	13,727,000
Loss (gain) on the sale of assets	(121,673,000)	(5,678,000)
Gain on early extinguishment of debt	(21,914,000)	0
Changes in working capital:
Accounts receivable	103,390,000	201,428,000
Other current assets	(4,056,000)	(5,035,000)
Accounts payable	(27,353,000)	(29,132,000)
Accrued liabilities and other	(45,853,000)	(125,907,000)
Net cash provided from operating activities	203,268,000	445,516,000
Investing activities:
Additions to natural gas properties	(254,073,000)	(380,718,000)
Additions to field service assets	(1,851,000)	(697,000)
Acreage purchases	(14,486,000)	(31,920,000)
Proceeds from disposal of assets	1,071,000	34,366,000
Purchases of marketable securities held by the deferred compensation plan	(11,509,000)	(15,170,000)
Proceeds from the sales of marketable securities held by the deferred compensation plan	16,489,000	18,226,000
Net cash used in investing activities	(264,359,000)	(375,913,000)
Financing activities:
Borrowings on credit facilities	1,045,000,000	1,151,000,000
Repayments on credit facilities	(883,000,000)	(1,199,000,000)
Issuance of senior notes	550,000,000	0
Repayment of senior or senior subordinated notes	(617,982,000)	0
Dividends paid	0	(10,049,000)
Treasury stock purchases	(22,992,000)	0
Debt issuance costs	(8,360,000)	0
Taxes paid for shares withheld	(2,352,000)	(3,343,000)
Change in cash overdrafts	657,000	(8,762,000)
Proceeds from the sales of common stock held by the deferred compensation plan	142,000	513,000
Net cash provided from (used in) financing activities	61,113,000	(69,641,000)
Increase (decrease) in cash and cash equivalents	22,000	(38,000)
Cash and cash equivalents at beginning of period	546,000	545,000
Cash and cash equivalents at end of period	$ 568,000	$ 507,000