CONSOLIDATED STATEMENT OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
CASH FLOWS FROM OPERATING ACTIVITIES
Net income (loss)	$ (417,124)	$ (113,891)	$ 104,468
Adjustments to reconcile net income (loss) to cash provided by operating activities:
Depreciation, depletion and amortization	590,128	622,211	632,760
Impairment of oil and gas properties and other assets	435,619	114,875	771,037
Deferred income tax benefit	(230,707)	(72,968)	(112,567)
(Gain) loss on sale of assets	1,857	(3,866)	(17,120)
Exploratory dry hole cost	10,120	3,452	7,907
(Gain) loss on derivative instruments	38,950	(56,686)	(219,319)
Net cash received (paid) in settlement of derivative instruments	(1,682)	194,289	81,716
(Earnings) loss on equity method investments	2,477	(6,415)	(3,080)
Amortization of debt issuance costs	5,083	4,454	4,754
Stock-based compensation and other	25,982	13,645	21,429
Changes in assets and liabilities:
Accounts receivable, net	(71,060)	112,406	(11,689)
Income taxes	(5,975)	(711)	(34,282)
Inventories	3,044	(3,023)	3,441
Other current assets	(21)	(817)	733
Accounts payable and accrued liabilities	5,794	(64,078)	(7,583)
Interest payable	(2,573)	(455)	10,466
Other assets and liabilities	2,465	(1,685)	1,989
Stock-based compensation tax benefit	0	0	1,375
Net cash provided by operating activities	392,377	740,737	1,236,435
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(375,153)	(955,602)	(1,479,632)
Acquisitions	0	(16,312)	(214,737)
Proceeds from sale of assets	50,419	7,653	39,492
Restricted cash	0	0	28,094
Investment in equity method investments	(28,484)	(29,073)	(38,057)
Net cash used in investing activities	(353,218)	(993,334)	(1,664,840)
CASH FLOWS FROM FINANCING ACTIVITIES
Borrowings from debt	90,000	877,000	2,032,000
Repayments of debt	(587,000)	(604,000)	(1,427,000)
Treasury stock repurchases	0	0	(138,852)
Sale of common stock, net	995,279	0	0
Dividends paid	(36,187)	(33,090)	(33,278)
Stock-based compensation tax benefit	0	0	(1,375)
Capitalized debt issuance costs	(3,223)	(7,838)	(5,626)
Other	0	85	90
Net cash provided by financing activities	458,869	232,157	425,959
Net increase (decrease) in cash and cash equivalents	498,028	(20,440)	(2,446)
Cash and cash equivalents, beginning of period	514	20,954	23,400
Cash and cash equivalents, end of period	$ 498,542	$ 514	$ 20,954