Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Net income (loss)	$ (67,342)	$ 8,295
(Income) loss from discontinued operations, net of income taxes	(1,104)	1,540
Adjustments to reconcile income (loss) from continuing operations to net cash provided by operating activities from continuing operations
Depreciation, depletion and amortization	153,202	145,340
(Gain) loss on derivatives, net	(13,844)	60,630
Net cash received (paid) for derivative settlements	94,193	(17,788)
Loss on extinguishment of debt	38,137	0
Stock-based compensation, net	14,796	29,139
Deferred income taxes	(37,961)	305
Non-cash interest expense, net	2,787	1,346
Other, net	5,384	1,594
Changes in operating assets and liabilities-
Accounts receivable	3,732	(23,139)
Accounts payable	(16,437)	4,526
Accrued liabilities	(6,605)	(14,040)
Other, net	(3,286)	(2,102)
Net cash provided by operating activities from continuing operations	165,652	195,646
Net cash used in operating activities from discontinued operations	(1,220)	(903)
Net cash provided by operating activities	164,432	194,743
Cash Flows From Investing Activities
Capital expenditures - oil and gas properties	(377,995)	(474,011)
Capital expenditures - other property and equipment	(1,173)	(375)
Proceeds from sales of oil and gas properties, net	285	7,434
Other, net	(3,684)	1,913
Net cash used in investing activities from continuing operations	(382,567)	(465,039)
Net cash used in investing activities from discontinued operations	(937)	(4,679)
Net cash used in investing activities	(383,504)	(469,718)
Cash Flows From Financing Activities
Issuance of senior notes	650,000	0
Tender and redemption of senior notes	(626,681)	0
Payment of deferred purchase payment	(150,000)	0
Borrowings under credit agreement	800,939	293,000
Repayments of borrowings under credit agreement	(683,939)	(172,000)
Payments of debt issuance costs	(11,443)	(594)
Sale of common stock, net of offering costs	231,316	0
Excess tax benefits from stock-based compensation	0	5,678
Proceeds from stock options exercised	46	74
Net cash provided by financing activities from continuing operations	210,238	126,158
Net cash provided by financing activities from discontinued operations	0	0
Net cash provided by financing activities	210,238	126,158
Net Decrease in Cash and Cash Equivalents	(8,834)	(148,817)
Cash and Cash Equivalents, Beginning of Period	10,838	157,439
Cash and Cash Equivalents, End of Period	2,004	$ 8,622
8.625% Senior Notes [Member]
Adjustments to reconcile income (loss) from continuing operations to net cash provided by operating activities from continuing operations
Loss on extinguishment of debt	$ (38,100)