Condensed Consolidated Statement of Cash Flows (USD $) In Thousands	9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010
Cash Flows from Operating Activities:
Net Income (Loss)	$ (86,350)	$ (26,278)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation, depletion and amortization	18,698	21,290
Impairment of oil and gas properties	28,793	7,692
Deferred tax expense (benefit)	23,052	6,195
Unrealized (gains) losses on derivatives	(11,098)	(11,477)
Amortization of non-cash compensation	2,733	2,786
Amortization of loan costs and discount	9,553	6,980
Non-cash interest expense	9,306	5,179
Other	1,839	(1,178)
Changes in operating assets and liabilities:
(Increase) decrease in receivables	1,616	4,988
(Increase) decrease in other current assets	(7,944)	(2,340)
Increase (decrease) in liabilities	(18,817)	17,465
Net Cash Provided by (Used in) Operating Activities	(28,619)	31,302
Cash Flows From Investing Activities:
Capital expenditures	(113,137)	(75,677)
Acquisitions	(22,898)	(39,279)
(Increase) Decrease in restricted cash	31,726	(29,645)
Net Cash Provided by (Used in) Investing Activities	(104,309)	(144,601)
Cash Flows From Financing Activities:
Repayments of borrowings	(97,638)	(74,942)
Borrowings under debt agreements	210,000	175,000
Proceeds from issuance of common Stock	118,444	30,181
Dividends paid	(1,400)	(1,563)
Financing costs paid	(11,226)	(26,219)
Other financing	511	82
Net Cash Provided by (Used in) Financing Activities	218,691	102,539
Net Increase (Decrease) n Cash and Cash Equivalents	85,763	(10,760)
Cash and Cash Equivalents, Beginning of Period	99,267	27,287
Cash and Cash Equivalents, End of Period	185,030	16,527
Cash and Cash Equivalents, End of Period:
Total	$ 185,030	$ 16,527