Consolidated Statements of Cash Flows (USD $) In Thousands	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 8,477	$ 21,521
Adjustments to reconcile net income to net cash provided by operating activities-
Depreciation, depletion and amortization	37,271	20,920
Unrealized (gain) loss on derivative instruments	3,032	(12,269)
Impairment of oil and gas properties		2,731
Accretion related to asset retirement obligations	145	104
Loss on extinguishment of debt	897
Stock-based compensation	10,655	5,320
Allowance for doubtful accounts	(54)	345
Deferred income taxes	4,739	12,995
Amortization of discount and deferred financing costs, net of amounts capitalized	1,570	4,066
Other, net	4,058	813
Changes in operating assets and liabilities-
Accounts receivable	(2,912)	(9,327)
Accounts payable	8,381	(5,295)
Accrued liabilities	3,876	(2,562)
Other, net	(6,013)	816
Net cash provided by operating activities	74,122	40,178
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(219,179)	(164,949)
Change in capital expenditure payables and accruals	12,464	(2,662)
Proceeds from sales of oil and gas properties	101,590	1,977
Advances to operators	(138)	116
Advances for joint operations	12,368	(412)
Other, net	(221)	(287)
Net cash used in investing activities	(93,116)	(166,217)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from borrowings	346,000	163,600
Debt repayments	(298,660)	(113,000)
Proceeds from common stock offering, net of offering costs		74,042
Proceeds from stock options exercised	47	667
Payments of debt issuance costs	(8,419)	(355)
Net cash provided by financing activities	38,968	124,954
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	19,974	(1,085)
CASH AND CASH EQUIVALENTS, beginning of period	4,128	3,837
CASH AND CASH EQUIVALENTS, end of period	$ 24,102	$ 2,752