Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 9,423	$ 735
Adjustments to reconcile net income to net cash provided by operating activities-
Depreciation, depletion and amortization	31,561	16,676
Unrealized (gain) loss on derivative instruments	8,095	10,194
Accretion related to asset retirement obligations	178	74
Loss on extinguishment of debt		897
Stock-based compensation	4,016	3,850
Allowance for (recoveries of) doubtful accounts	40	(32)
Deferred income taxes	4,018	1,064
Amortization of debt discount and deferred financing costs, net of amounts capitalized	1,274	865
Other, net	1,972	1,860
Changes in operating assets and liabilities-
Accounts receivable	(20,746)	(1,922)
Accounts payable	27,892	9,452
Accrued liabilities	16,896	11,192
Other, net	(1,377)	(2,628)
Net cash provided by operating activities	83,242	52,277
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(202,739)	(107,565)
Increase in capital expenditure payables and accruals	4,982	11,869
Proceeds from sales of oil and gas properties, net	693	362
Advances to operators	94	(34)
Advances for joint operations	(28,535)	(3,364)
Other, net	(1,416)	(210)
Net cash used in investing activities	(226,921)	(98,942)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from borrowings and issuances	248,358	219,000
Debt repayments	(109,000)	(146,660)
Payments of debt issuance and retirement costs	(222)	(7,856)
Proceeds from stock options exercised		9
Net cash provided by financing activities	139,136	64,493
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	(4,543)	17,828
CASH AND CASH EQUIVALENTS, beginning of period	28,112	4,128
CASH AND CASH EQUIVALENTS, end of period	$ 23,569	$ 21,956