Condensed Consolidated Statement of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Cash Flows from Operating Activities:
Net loss	$ (67,817)	$ (119,773)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation, depletion and amortization	93,466	42,292
Impairment of oil and gas properties	9,566	47,116
Deferred tax benefit	(17,262)	(15,849)
Unrealized (gains) lossess on derivatives	(1,158)	2,178
Amortization of non-cash compensation	2,352	3,605
Amortization of loan costs and discount	15,330	10,536
Non-cash interest expense	5,246	7,077
Loss on early extinguishment of debt		21,661
Other	10,192	9,692
Changes in operating assets and liabilities:
Decrease in receivables	21,685	5,553
Increase in other current assets	(3,226)	(14,550)
Increase (decrease) in liabilities	(13,587)	1,806
Net Cash Provided by Operating Activities	54,787	1,344
Cash Flows From Investing Activities:
Capital expenditures	(176,171)	(175,597)
Acquisitions, net of cash acquired	(2,602)	(228,437)
Increase in restricted cash		(179)
Net Cash Used in Investing Activities	(178,773)	(404,213)
Cash Flows From Financing Activities:
Repayments of borrowings		(247,065)
Borrowings under debt agreements, net of debt discount		595,000
Proceeds from issuance of common stock		60,805
Proceeds from issuance of monetary production payment	150,000
Repayments of monetary production payment	(4,167)
Dividends paid	(1,249)	(833)
Payments for early extinguishment of debt		(7,248)
Financing costs paid	(19,427)	(28,109)
Other financing	1	5
Net Cash Provided by Financing Activities	125,158	372,555
Net Increase (Decrease) in Cash and Cash Equivalents	1,172	(30,314)
Cash and Cash Equivalents, Beginning of Period	59,185	106,036
Cash and Cash Equivalents, End of Period	$ 60,357	$ 75,722