Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Net Income	$ 67,672	$ 36,997
Net income from discontinued operations, net of income taxes	(23,599)	(2,583)
Adjustments to reconcile net income from continuing operations to net cash provided by operating activities-
Depreciation, depletion and amortization	151,232	121,459
Unrealized loss on derivative instruments, net	25,806	3,569
Accretion related to asset retirement obligations	355	280
Stock-based compensation, net of amounts capitalized	19,338	10,622
Allowance for doubtful accounts	(105)	(391)
Deferred income taxes	25,853	20,972
Amortization of debt discount and deferred financing costs, net of amounts capitalized	3,217	3,236
Other, net	1,894	2,646
Changes in operating assets and liabilities-
Accounts receivable	1,910	(71,215)
Accounts payable	38,843	31,699
Accrued liabilities	2,049	23,325
Other, net	(4,212)	(3,977)
Net cash provided by operating activities - continuing operations	310,253	176,639
Net cash used in operating activities - discontinued operations	(400)	(402)
Net cash provided by operating activities	309,853	176,237
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures - oil and gas properties	(571,069)	(575,971)
Capital expenditures - other property and equipment	(687)	(3,689)
Increase (decrease) in capital expenditure payables and accruals	23,020	(14,583)
Proceeds from sales of oil and gas properties, net	20,753	207,250
Advances to operators	1,537	(852)
Advances for joint operations	26,459	(42,986)
Other, net	(3,414)	(5,389)
Net cash used in investing activities - continuing operations	(503,401)	(436,220)
Net cash provided by (used in) investing activities - discontinued operations	126,223	(29,442)
Net cash used in investing activities	(377,178)	(465,662)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from borrowings and issuances	437,000	1,036,000
Debt repayments	(419,325)	(783,000)
Payments of costs associated with revolving credit facility and debt issuance	(1,075)	(6,005)
Proceeds from stock options exercised	839	74
Net cash provided by financing activities - continuing operations	17,439	247,069
Net cash provided by financing activities - discontinued operations	3,000	28,532
Net cash provided by financing activities	20,439	275,601
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	(46,886)	(13,824)
CASH AND CASH EQUIVALENTS, beginning of period	52,614	28,112
CASH AND CASH EQUIVALENTS, end of period	$ 5,728	$ 14,288