Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Net income (loss)	$ 989,700	$ 789,447	$ (399,679)
Adjustments to reconcile net income (loss) to cash provided by operating activities:
Depreciation, depletion, amortization and accretion	1,859,118	1,670,838	1,709,567
Property impairments	125,210	237,370	237,292
Non-cash (gain) loss on derivatives, net	(13,009)	(58,031)	156,621
Stock-based compensation	47,236	45,868	48,098
Tax benefit from US tax reform legislation	0	(713,655)	0
Provision (benefit) for deferred income taxes from operations	314,878	88,056	(209,836)
Tax deficiency from stock-based compensation	0	0	9,828
Dry hole costs	147	176	4,866
Litigation settlement	0	59,600	0
Net gain on sale of assets and other	(16,671)	(55,124)	(304,489)
Loss on extinguishment of debt	7,133	554	26,055
Other, net	16,558	12,592	9,812
Changes in assets and liabilities:
Accounts receivable	94,765	(329,811)	(158,383)
Inventories	7,735	14,517	(17,836)
Other current assets	(3,539)	1,038	968
Accounts payable trade	9,274	137,339	(14,404)
Revenues and royalties payable	24,010	158,982	30,455
Accrued liabilities and other	(4,162)	21,368	(883)
Other noncurrent assets and liabilities	(2,375)	(2,018)	(2,133)
Net cash provided by operating activities	3,456,008	2,079,106	1,125,919
Cash flows from investing activities:
Exploration and development	(2,840,880)	(1,931,942)	(1,154,131)
Purchase of producing crude oil and natural gas properties	(31,579)	(8,446)	(5,008)
Purchase of other property and equipment	(42,171)	(12,810)	(5,375)
Proceeds from sale of assets	54,458	144,353	631,549
Net cash used in investing activities	(2,860,172)	(1,808,845)	(532,965)
Cash flows from financing activities:
Credit facility borrowings	2,024,000	1,302,000	1,691,000
Repayment of credit facility	(2,212,000)	(2,019,000)	(1,639,000)
Proceeds from issuance of Senior Notes	0	990,000	0
Redemption of Senior Notes	(400,000)	0	(600,000)
Premium on redemption of Senior Notes	(6,700)	0	(19,168)
Repayment of other debt	(2,286)	(502,214)	(2,144)
Debt issuance costs	(5,535)	(1,999)	(40)
Equity transaction costs	(4,838)	0	0
Contributions from noncontrolling interests	267,920	0	0
Distributions to noncontrolling interests	(604)	0	0
Repurchase of restricted stock for tax withholdings	(16,891)	(11,821)	(8,593)
Tax deficiency from stock-based compensation	0	0	(9,828)
Net cash used in financing activities	(356,934)	(243,034)	(587,773)
Effect of exchange rate on cash and cash equivalents	(55)	32	(1)
Net change in cash and cash equivalents	238,847	27,259	5,180
Cash and cash equivalents at beginning of period	43,902	16,643	11,463
Cash and cash equivalents at end of period	$ 282,749	$ 43,902	$ 16,643