Consolidated Statement Of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash Flows from Operating Activities:
Net loss	$ (840,255)us-gaap_NetIncomeLoss	$ (95,479)us-gaap_NetIncomeLoss	$ (126,226)us-gaap_NetIncomeLoss
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation, depletion and amortization	175,744	143,048	66,564
Impairment of oil and gas properties	476,721us-gaap_ImpairmentOfOilAndGasProperties	9,566us-gaap_ImpairmentOfOilAndGasProperties	53,072us-gaap_ImpairmentOfOilAndGasProperties
Goodwill impairment loss	259,238us-gaap_GoodwillImpairmentLoss
Deferred tax benefit	(63,755)us-gaap_DeferredIncomeTaxExpenseBenefit	(14,255)us-gaap_DeferredIncomeTaxExpenseBenefit	(17,594)us-gaap_DeferredIncomeTaxExpenseBenefit
Unrealized gains (losses) on derivatives	(10,818)us-gaap_UnrealizedGainLossOnDerivatives	1,843us-gaap_UnrealizedGainLossOnDerivatives	(5,141)us-gaap_UnrealizedGainLossOnDerivatives
Amortization of non-cash compensation	(116)	3,606	4,401
Amortization of loan costs and discount	22,239	22,359	14,179
Non-cash interest expense	5,739us-gaap_PaidInKindInterest	7,082us-gaap_PaidInKindInterest	8,684us-gaap_PaidInKindInterest
Loss on early extinguishment of debt	22,708		21,661
Non-cash litigation settlement expense	14,034end_NoncashLitigationSettlementExpense
Non-cash reorganization items	33,518end_NonCashReorganizationItems
Other	(7,347)us-gaap_OtherNoncashIncomeExpense	16,330us-gaap_OtherNoncashIncomeExpense	15,365us-gaap_OtherNoncashIncomeExpense
Changes in operating assets and liabilities:
Decrease (increase) in receivables	29,486	(18,991)	(24,319)
Decrease (increase) in other current assets	(16,267)	1,324	(592)
Increase (decrease) in liabilities	(32,982)	(18,985)	28,559
Net Cash Provided by Operating Activities	67,887	57,448	38,613
Cash Flows From Investing Activities:
Capital expenditures	(91,619)	(225,755)	(246,925)
Acquisitions, net of cash acquired		(2,787)	(238,854)
Proceeds from sales, net of cash	1,353	6,774	1,407
Proceeds from insurance settlement	15,120
Increase in restricted cash	(100,113)		(178)
Net Cash Used in Investing Activities	(175,259)	(221,768)	(484,550)
Cash Flows From Financing Activities:
Repayments of borrowings	(240,163)us-gaap_RepaymentsOfDebt		(274,629)us-gaap_RepaymentsOfDebt
Borrowings under debt agreements, net of debt discount	571,825		654,023
Proceeds from issuance of common stock	12,396		60,805
Proceeds from issuance of Monetary Production Payment		175,000
Repayments of Monetary Production Payment	(166,667)	(8,333)
Payments for early extinguishment of debt			(7,248)
Financing costs paid	(19,809)us-gaap_PaymentsOfDebtIssuanceCosts	(25,210)us-gaap_PaymentsOfDebtIssuanceCosts	(32,204)us-gaap_PaymentsOfDebtIssuanceCosts
Other financing	(3,102)	(1,580)	(1,661)
Net Cash Provided by Financing Activities	154,480	139,877	399,086
Net Increase (Decrease) in Cash and Cash Equivalents	47,108	(24,443)	(46,851)
Cash and Cash Equivalents, Beginning of Period	34,742	59,185	106,036
Cash and Cash Equivalents, End of Period	$ 81,850	$ 34,742	$ 59,185

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The cash inflow from the additional capital contribution to the entity.

+ References

+ Details

Name:	us-gaap_ProceedsFromIssuanceOfCommonStock
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The cash inflow from a borrowing where a lender is placed in a lien position behind debt having a higher priority of repayment (senior) in liquidation of the entity's assets or underlying collateral.

+ References

+ Details

Name:	us-gaap_ProceedsFromIssuanceOfSubordinatedLongTermDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The net cash inflow or outflow from other financing activities. This element is used when there is not a more specific and appropriate element in the taxonomy.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 8

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3095-108585

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 9

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3098-108585

+ Details

Name:	us-gaap_ProceedsFromPaymentsForOtherFinancingActivities
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The cash inflow to dispose of long-lived, physical assets and mineral interests in oil and gas properties used for normal oil and gas operations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 12

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585

+ Details

Name:	us-gaap_ProceedsFromSaleOfOilAndGasPropertyAndEquipment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations.

+ References

No definition available.

+ Details

Name:	us-gaap_RepaymentsOfDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in earnings for the period.

+ References

+ Details

Name:	us-gaap_UnrealizedGainLossOnDerivatives
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration