Unaudited Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Cash flows from operating activities
Net income (loss)	$ 469	$ (198,326)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation, Depletion, Amortization and Accretion	381,385	465,451
Property impairments	51,372	78,927
Non-cash gain on derivatives, net	(45,155)	(1,863)
Stock-based compensation	11,438	9,206
Provision (benefit) for deferred income taxes	6,021	(121,352)
Dry hole costs	157	0
(Gain) loss on sale of assets, net	3,638	(109)
Other, net	3,099	2,514
Changes in assets and liabilities:
Accounts receivable	(22,053)	66,839
Inventories	13,297	1,319
Other current assets	(3,111)	(2,082)
Accounts payable trade	61,745	(31,531)
Revenues and royalties payable	20,543	(17,380)
Accrued liabilities and other	(12,338)	29,806
Other noncurrent assets and liabilities	(306)	(2,517)
Net cash provided by operating activities	470,201	278,902
Cash flows from investing activities
Exploration and development	(388,596)	(359,090)
Purchase of producing crude oil and natural gas properties	(137)	0
Purchase of other property and equipment	(6,336)	(1,927)
Proceeds from sale of assets	5,798	2,206
Net cash used in investing activities	(389,271)	(358,811)
Cash flows from financing activities
Credit facility borrowings	256,000	288,000
Repayment of credit facility	(326,000)	(201,000)
Repayment of other debt	(548)	(530)
Debt issuance costs	0	(40)
Repurchase of restricted stock for tax withholdings	(9,837)	(5,088)
Net cash (used in) provided by financing activities	(80,385)	81,342
Effect of Exchange Rate on Cash and Cash Equivalents	0	31
Net change in cash and cash equivalents	545	1,464
Cash and cash equivalents at beginning of period	16,643	11,463
Cash and cash equivalents at end of period	$ 17,188	$ 12,927