Unaudited Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Cash flows from operating activities
Net income (loss)	$ 790,580	$ (52,467)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation, Depletion, Amortization and Accretion	1,370,676	1,199,715
Property impairments	86,715	209,819
Non-cash (gain) loss on derivatives, net	12,013	(65,481)
Stock-based compensation	33,209	32,490
Provision (benefit) for deferred income taxes	252,012	(25,063)
Dry hole costs	1	157
Gain on sale of assets, net	(8,261)	(703)
Loss on extinguishment of debt	7,133	0
Other, net	11,068	7,705
Changes in assets and liabilities:
Accounts receivable	(139,219)	(154,790)
Inventories	(7,852)	6,736
Other current assets	(4,766)	729
Accounts payable trade	32,708	128,337
Revenues and royalties payable	86,814	48,447
Accrued liabilities and other	(19,677)	13,050
Other noncurrent assets and liabilities	(2,413)	(700)
Net cash provided by operating activities	2,500,741	1,347,981
Cash flows from investing activities
Exploration and development	(2,093,010)	(1,444,991)
Purchase of producing crude oil and natural gas properties	(25,476)	(3,480)
Purchase of other property and equipment	(15,724)	(10,508)
Proceeds from sale of assets	30,727	84,725
Net cash used in investing activities	(2,103,483)	(1,374,254)
Cash flows from financing activities
Credit facility borrowings	1,706,000	985,000
Repayment of credit facility	(1,704,000)	(952,000)
Redemption of Senior Notes	(400,000)	0
Premium and costs on redemption of Senior Notes	(6,700)	0
Repayment of other debt	(1,707)	(1,654)
Debt issuance costs	(5,543)	0
Repurchase of restricted stock for tax withholdings	(16,303)	(10,985)
Net cash (used in) provided by financing activities	(428,253)	20,361
Effect of Exchange Rate on Cash and Cash Equivalents	(11)	34
Net change in cash and cash equivalents	(31,006)	(5,878)
Cash and cash equivalents at beginning of period	43,902	16,643
Cash and cash equivalents at end of period	$ 12,896	$ 10,765