Condensed Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Cash Flows from Operating Activities:
Net loss	$ (110,661)us-gaap_NetIncomeLoss	$ (44,870)us-gaap_NetIncomeLoss
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation, depletion and amortization	56,561	44,968
Impairment of oil and gas properties	90,087us-gaap_ImpairmentOfOilAndGasProperties
Deferred tax expense (benefit)	(11,137)us-gaap_DeferredIncomeTaxExpenseBenefit	1,969us-gaap_DeferredIncomeTaxExpenseBenefit
Unrealized gains on derivatives		(2,659)us-gaap_UnrealizedGainLossOnDerivatives
Amortization of non-cash compensation	(10)	971
Amortization of loan costs and discount	2,238	6,705
Non-cash interest expense		1,883us-gaap_PaidInKindInterest
Loss on early extinguishment of financing agreements		6,856
Non-cash litigation settlement expense		19,034end_NoncashLitigationSettlementExpense
Other	(5,017)us-gaap_OtherNoncashIncomeExpense	1,847us-gaap_OtherNoncashIncomeExpense
Changes in operating assets and liabilities:
Decrease in receivables	1,237	19,001
(Increase) decrease in other current assets	2,624	(5,056)
Decrease in liabilities	(23,058)	(23,100)
Net Cash Provided by Operating Activities	2,864	27,549
Cash Flows From Investing Activities:
Capital expenditures	(23,101)	(28,845)
Proceeds from sale of oil and gas interests		1,352
(Increase) decrease in restricted cash	4,885	(2,457)
Net Cash Used in Investing Activities	(18,216)	(29,950)
Cash Flows From Financing Activities:
Repayments of borrowings		(115,163)us-gaap_RepaymentsOfDebt
Borrowings under debt agreements, net of debt discount		140,625
Proceeds from issuance of common stock		12,376
Repayments of Monetary Production Payments		(5,000)
Financing costs paid		(9,273)us-gaap_PaymentsOfDebtIssuanceCosts
Other financing		(416)
Net Cash Provided by (Used in) Financing Activities		23,149
Net Increase (Decrease) in Cash and Cash Equivalents	(15,352)	20,748
Cash and Cash Equivalents, Beginning of Period	81,850	34,742
Cash and Cash Equivalents, End of Period	$ 66,498	$ 55,490

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