Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Cash flows from operating activities:
Net income (loss)	$ (353,668)	$ 977,341	$ 764,219
Adjustments to reconcile net income (loss) to cash provided by operating activities:
Depreciation, depletion, amortization and accretion	1,746,454	1,368,311	965,437
Property impairments	402,131	616,888	220,508
Non-cash (gain) loss on derivatives, net	(21,532)	(174,409)	130,196
Stock-based compensation	51,834	54,353	39,890
Provision (benefit) for deferred income taxes	(181,441)	584,677	442,621
Excess tax benefit from stock-based compensation	(13,177)	0	0
Dry hole costs	8,381	23,679	9,350
Gain on sale of assets, net	(23,149)	(600)	(88)
Loss on extinguishment of debt	0	24,517	0
Other, net	12,646	7,637	2,037
Changes in assets and liabilities:
Accounts receivable	524,973	(129,634)	(166,138)
Inventories	7,997	(65,919)	(7,697)
Other current assets	65,493	(57,489)	(11,537)
Accounts payable trade	(201,434)	85,540	107,250
Revenues and royalties payable	(85,754)	(18,022)	28,401
Accrued liabilities and other	(84,056)	58,880	44,260
Other noncurrent assets and liabilities	1,403	(35)	(5,414)
Net cash provided by operating activities	1,857,101	3,355,715	2,563,295
Cash flows from investing activities:
Exploration and development	(3,042,747)	(4,604,468)	(3,660,773)
Purchase of producing crude oil and natural gas properties	(557)	(48,917)	(16,604)
Purchase of other property and equipment	(36,951)	(63,402)	(62,054)
Proceeds from sale of assets and other	34,008	129,388	28,420
Net cash used in investing activities	(3,046,247)	(4,587,399)	(3,711,011)
Cash flows from financing activities:
Credit facility borrowings	2,001,000	1,695,000	970,000
Repayment of credit facility	(1,313,000)	(1,805,000)	(1,290,000)
Proceeds from issuance of Senior Notes	0	1,681,834	1,479,375
Redemption of Senior Notes	0	(300,000)	0
Premium on redemption of Senior Notes	0	(17,497)	0
Proceeds from other debt	500,000	0	0
Repayment of other debt	(2,078)	(2,013)	(1,951)
Debt issuance costs	(4,597)	(8,026)	(2,265)
Repurchase of restricted stock for tax withholdings	(7,313)	(16,583)	(14,690)
Excess tax benefit from stock-based compensation	13,177	0	0
Net cash provided by financing activities	1,187,189	1,227,715	1,140,469
Effect of exchange rate on cash and cash equivalents	(10,961)	(132)	0
Net change in cash and cash equivalents	(12,918)	(4,101)	(7,247)
Cash and cash equivalents at beginning of period	24,381	28,482	35,729
Cash and cash equivalents at end of period	$ 11,463	$ 24,381	$ 28,482