Unaudited Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Cash flows from operating activities
Net income (loss)	$ (131,971)	$ 226,234
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation, depletion, amortization and accretion	391,026	281,115
Property impairments	147,561	58,208
Non-cash (gain) loss on derivatives, net	(9,320)	6,410
Stock-based compensation	11,263	11,039
Provision (benefit) for deferred income taxes	(54,026)	131,315
Dry hole costs	8,401	0
(Gain) loss on sale of assets, net	(2,070)	8,498
Other, net	2,261	1,754
Changes in assets and liabilities:
Accounts receivable	173,088	(53,857)
Inventories	(6,236)	(17,669)
Prepaid expenses and other	48,967	(525)
Accounts payable trade	5,185	13,854
Revenues and royalties payable	(45,844)	34,623
Accrued liabilities and other	(17,460)	(9,191)
Other noncurrent assets and liabilities	1,365	(1,146)
Net cash provided by operating activities	522,190	690,662
Cash flows from investing activities
Exploration and development	(1,267,252)	(993,682)
Purchase of producing crude oil and natural gas properties	(132)	(30,278)
Purchase of other property and equipment	(11,923)	(30,953)
Proceeds from sale of assets	903	35,433
Net cash used in investing activities	(1,278,404)	(1,019,480)
Cash flows from financing activities
Credit facility borrowings	930,000	525,000
Repayment of credit facility	(140,000)	(170,000)
Repayment of other debt	(515)	(499)
Debt issuance costs	(2,099)	0
Repurchase of restricted stock for tax withholdings	(3,003)	(2,630)
Net cash provided by financing activities	784,383	351,871
Effect of Exchange Rate on Cash and Cash Equivalents	(4,905)	0
Net change in cash and cash equivalents	23,264	23,053
Cash and cash equivalents at beginning of period	24,381	28,482
Cash and cash equivalents at end of period	$ 47,645	$ 51,535