Unaudited Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Cash flows from operating activities
Net loss	$ (63,088)	$ (317,727)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation, Depletion, Amortization and Accretion	774,810	908,021
Property impairments	174,689	145,039
Non-cash (gain) loss on derivatives, net	(68,420)	114,972
Stock-based compensation	20,571	21,046
Benefit for deferred income taxes	(31,834)	(193,990)
Dry hole costs	157	206
(Gain) loss on sale of assets, net	2,859	(97,016)
Other, net	5,089	4,752
Changes in assets and liabilities:
Accounts receivable	(19,347)	(34,939)
Inventories	14,984	(8,745)
Other current assets	(2,225)	(2,125)
Accounts payable trade	105,441	(53,859)
Revenues and royalties payable	21,105	(742)
Accrued liabilities and other	(17,968)	15,347
Other noncurrent assets and liabilities	(251)	(2,519)
Net cash provided by operating activities	916,572	497,721
Cash flows from investing activities
Exploration and development	(877,115)	(625,126)
Purchase of producing crude oil and natural gas properties	(812)	0
Purchase of other property and equipment	(9,372)	(4,867)
Proceeds from sale of assets	7,979	112,199
Net cash used in investing activities	(879,320)	(517,794)
Cash flows from financing activities
Credit facility borrowings	540,000	638,000
Repayment of credit facility	(565,000)	(606,000)
Repayment of other debt	(1,099)	(1,064)
Debt issuance costs	0	(40)
Repurchase of restricted stock for tax withholdings	(10,620)	(5,735)
Net cash (used in) provided by financing activities	(36,719)	25,161
Effect of Exchange Rate on Cash and Cash Equivalents	14	9
Net change in cash and cash equivalents	547	5,097
Cash and cash equivalents at beginning of period	16,643	11,463
Cash and cash equivalents at end of period	$ 17,190	$ 16,560