Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Net income	$ 8,295	$ 63,151
(Income) loss from discontinued operations, net of income taxes	1,540	(24,790)
Adjustments to reconcile income from continuing operations to net cash provided by operating activities from continuing operations
Depreciation, depletion and amortization	145,340	96,225
Non-cash (gain) loss on derivatives, net	42,842	(3,166)
Stock-based compensation	29,139	9,466
Deferred Income Tax Expense (Benefit)	305	23,994
Non-cash interest expense, net	1,346	2,386
Other, net	1,594	251
Changes in operating assets and liabilities-
Accounts receivable	(23,139)	(4,938)
Accounts payable	4,526	73,771
Accrued liabilities	(14,040)	(19,035)
Other, net	(2,102)	(3,593)
Net cash provided by operating activities from continuing operations	195,646	213,722
Net cash used in operating activities from discontinued operations	(903)	(80)
Net cash provided by operating activities	194,743	213,642
Cash Flows From Investing Activities
Capital expenditures - oil and gas properties	(474,011)	(372,582)
Capital expenditures - other property and equipment	(375)	(1,196)
Proceeds from sales of oil and gas properties, net	7,434	10,681
Other, net	1,913	11,030
Net cash used in investing activities from continuing operations	(465,039)	(352,067)
Net cash provided by (used in) investing activities from discontinued operations	(4,679)	128,179
Net cash used in investing activities	(469,718)	(223,888)
Cash Flows From Financing Activities
Long-term borrowings under revolving credit facility	293,000	165,000
Repayments of long-term borrowings under revolving credit facility	(172,000)	(206,325)
Payments of debt issuance costs	(594)	(962)
Excess Tax Benefit from Share-based Compensation, Financing Activities	5,678	0
Proceeds from stock options exercised	74	766
Net cash provided by (used in) financing activities from continuing operations	126,158	(41,521)
Net cash provided by financing activities from discontinued operations	0	3,000
Net cash provided by (used in) financing activities	126,158	(38,521)
Net increase (decrease) in cash and cash equivalents	(148,817)	(48,767)
Cash and Cash Equivalents, Beginning of Period	157,439	52,614
Cash and Cash Equivalents, End of Period	$ 8,622	$ 3,847