Unaudited Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Cash flows from operating activities
Net income (loss)	$ (131,568)	$ 329,772
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation, depletion, amortization and accretion	838,216	606,638
Property impairments	224,432	137,524
Non-cash (gain) loss on derivatives, net	8,599	204,791
Stock-based compensation	27,429	26,017
Provision (benefit) for deferred income taxes	(49,890)	190,571
Dry hole costs	8,003	4,383
(Gain) loss on sale of assets, net	(22,643)	6,363
Other, net	5,388	4,411
Changes in assets and liabilities:
Accounts receivable	138,882	(144,821)
Inventories	1,938	(23,519)
Other current assets	(50,561)	7,938
Accounts payable trade	(106,174)	44,505
Revenues and royalties payable	(17,589)	42,051
Accrued liabilities and other	(60,162)	9,186
Other noncurrent assets and liabilities	1,390	2,519
Net cash provided by operating activities	916,812	1,432,453
Cash flows from investing activities
Exploration and development	(1,972,887)	(2,052,870)
Purchase of producing crude oil and natural gas properties	(557)	(33,606)
Purchase of other property and equipment	(22,449)	(29,829)
Proceeds from sale of assets	32,590	39,018
Net cash used in investing activities	(1,963,303)	(2,077,287)
Cash flows from financing activities
Credit facility borrowings	1,375,000	1,105,000
Repayment of credit facility	(315,000)	(1,380,000)
Proceeds from Issuance of Senior Long-term Debt	0	1,681,834
Repayment of other debt	(1,032)	(999)
Debt issuance costs	(2,110)	(7,874)
Repurchase of restricted stock for tax withholdings	(5,192)	(4,646)
Net cash provided by financing activities	1,051,666	1,393,315
Effect of Exchange Rate on Cash and Cash Equivalents	(4,098)	0
Net change in cash and cash equivalents	1,077	748,481
Cash and cash equivalents at beginning of period	24,381	28,482
Cash and cash equivalents at end of period	$ 25,458	$ 776,963