CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Operating activities:
Net income (loss)	$ 111,961,000	$ (360,679,000)
Adjustments to reconcile net income (loss) to net cash provided from operating activities:
Deferred income tax expense (benefit)	98,054,000	(185,169,000)
Depletion, depreciation and amortization and impairment	525,753,000	417,480,000
Exploration dry hole costs	9,166,000	2,000
Abandonment and impairment of unproved properties	52,181,000	23,769,000
Derivative fair value (income) loss	(188,326,000)	11,334,000
Cash settlements on derivative financial instruments	16,062,000	260,657,000
Allowance for bad debt	1,050,000	800,000
Amortization of deferred financing costs and other	4,184,000	5,383,000
Deferred and stock-based compensation	3,937,000	72,689,000
(Gain) loss on the sale of assets	(23,509,000)	7,544,000
Changes in working capital:
Accounts receivable	(39,694,000)	31,985,000
Inventory and other	(1,504,000)	(776,000)
Accounts payable	44,715,000	(41,268,000)
Accrued liabilities and other	(13,498,000)	(37,914,000)
Net cash provided from operating activities	600,532,000	205,837,000
Investing activities:
Additions to natural gas and oil properties	(771,067,000)	(339,446,000)
Additions to field service assets	(4,687,000)	(1,542,000)
Acreage purchases	(46,967,000)	(29,203,000)
MRD Merger, net of cash acquired	0	7,180,000
Proceeds from disposal of assets	27,583,000	191,834,000
Purchases of marketable securities held by the deferred compensation plan	(25,410,000)	(33,460,000)
Proceeds from the sales of marketable securities held by the deferred compensation plan	28,755,000	37,900,000
Net cash used in investing activities	(791,793,000)	(166,737,000)
Financing activities:
Borrowings on credit facilities	1,486,000,000	1,887,000,000
Repayments on credit facilities	(1,282,000,000)	(1,045,000,000)
Repayment of senior notes	(500,000)	(273,011,000)
Debt issuance costs	(247,000)	(6,381,000)
Dividends paid	(14,876,000)	(11,654,000)
Taxes paid for shares withheld	(6,971,000)	(3,800,000)
Change in cash overdrafts	5,588,000	432,000
Proceeds from the sales of common stock held by the deferred compensation plan	4,482,000	10,385,000
Net cash provided from (used in) financing activities	191,476,000	(39,029,000)
Increase in cash and cash equivalents	215,000	71,000
Cash and cash equivalents at beginning of period	314,000	471,000
Cash and cash equivalents at end of period	529,000	542,000
MRD
Financing activities:
Repayments on credit facilities	$ 0	$ (597,000,000)