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Emergence From Voluntary Reorganization Under Chapter 11 Proceedings (Details) (USD $) | 9 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2014 | Sep. 30, 2014 | Dec. 31, 2014
Class of Stock [Line Items] |  |  |
Total Stock, Shares Authorized | 120,000,000 leu_TotalStockSharesAuthorized | 120,000,000 leu_TotalStockSharesAuthorized |
Preferred Stock, Shares Authorized | 20,000,000 us-gaap_PreferredStockSharesAuthorized | 20,000,000 us-gaap_PreferredStockSharesAuthorized | 20,000,000 us-gaap_PreferredStockSharesAuthorized
Preferred Stock, Par or Stated Value Per Share | $ 1.00 us-gaap_PreferredStockParOrStatedValuePerShare | $ 1.00 us-gaap_PreferredStockParOrStatedValuePerShare |
Common Stock, Shares, Issued | 9,000,000 us-gaap_CommonStockSharesIssued | 9,000,000 us-gaap_CommonStockSharesIssued | 9,000,000 us-gaap_CommonStockSharesIssued
Long-term debt | $ 240,400,000 us-gaap_LongTermDebt | $ 240,400,000 us-gaap_LongTermDebt | $ 240,400,000 us-gaap_LongTermDebt
Debt Instrument, Interest Rate, Stated Percentage | 8.00%us-gaap_DebtInstrumentInterestRateStatedPercentage | 8.00%us-gaap_DebtInstrumentInterestRateStatedPercentage |
Convertible senior notes | 530,000,000 us-gaap_LongTermDebtCurrent | 530,000,000 us-gaap_LongTermDebtCurrent |
Convertible Noteholders, Percent of New Common Stock | 79.04%leu_ConvertibleNoteholdersPercentofNewCommonStock | 79.04%leu_ConvertibleNoteholdersPercentofNewCommonStock |
Interest Paid |  | 15,900,000 us-gaap_InterestPaid |
Convertible Noteholders, New Notes | 200,000,000 leu_ConvertibleNoteholdersNewNotes | 200,000,000 leu_ConvertibleNoteholdersNewNotes |
Preferred Stock, Dividend Rate, Percentage | 12.75%us-gaap_PreferredStockDividendRatePercentage |  |
Preferred Stock, Shares Outstanding | 85,903 us-gaap_PreferredStockSharesOutstanding | 85,903 us-gaap_PreferredStockSharesOutstanding |
Convertible preferred stock (Predecessor), 85,900 shares issued | 113,900,000 us-gaap_OtherLongTermDebtCurrent | 113,900,000 us-gaap_OtherLongTermDebtCurrent |
Class of Warrant or Right, Outstanding | 250,000 us-gaap_ClassOfWarrantOrRightOutstanding | 250,000 us-gaap_ClassOfWarrantOrRightOutstanding |
Preferred Investors, Each, Percent of New Common Stock | 7.98%leu_PreferredInvestorsEachPercentofNewCommonStock | 7.98%leu_PreferredInvestorsEachPercentofNewCommonStock |
Preferred Investors, Aggregate, Percent of New Common Stock | 15.96%leu_PreferredInvestorsAggregatePercentofNewCommonStock | 15.96%leu_PreferredInvestorsAggregatePercentofNewCommonStock |
Preferred Investors, Each, New Notes | 20,190,000 leu_PreferredInvestorsEachNewNotes | 20,190,000 leu_PreferredInvestorsEachNewNotes |
Government Funding Condition for Preferred Investor Investment | 1,500,000,000 leu_GovernmentFundingConditionforPreferredInvestorInvestment | 1,500,000,000 leu_GovernmentFundingConditionforPreferredInvestorInvestment |
Preferred Investors, Aggregate, New Notes | 40,380,000 leu_PreferredInvestorsAggregateNewNotes | 40,380,000 leu_PreferredInvestorsAggregateNewNotes |
Stockholders, Percent of New Common Stock | 5.00%leu_StockholdersPercentofNewCommonStock | 5.00%leu_StockholdersPercentofNewCommonStock |
Secured Intercompany Financing | 48,000,000 leu_SecuredIntercompanyFinancing | 48,000,000 leu_SecuredIntercompanyFinancing |
Funds for Payments under Reorganization Plan | 35,300,000 leu_FundsforPaymentsunderReorganizationPlan | 35,300,000 leu_FundsforPaymentsunderReorganizationPlan |
Funds for Working Capital under Reorganization Plan | 12,700,000 leu_FundsforWorkingCapitalunderReorganizationPlan | 12,700,000 leu_FundsforWorkingCapitalunderReorganizationPlan |
Debtor in Possession Financing Repayments | 16,300,000 leu_Debtorinpossessionfinancingrepayments |  |
Professional Fees | $ 3,100,000 us-gaap_ProfessionalFees |  |
Common Class A [Member] |  |  |
Class of Stock [Line Items] |  |  |
Common Stock, Shares Authorized | 70,000,000 us-gaap_CommonStockSharesAuthorized / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | 70,000,000 us-gaap_CommonStockSharesAuthorized / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | 70,000,000 us-gaap_CommonStockSharesAuthorized / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember
Common Stock, Par or Stated Value Per Share | $ 0.10 us-gaap_CommonStockParOrStatedValuePerShare / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | $ 0.10 us-gaap_CommonStockParOrStatedValuePerShare / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember |
Common Stock, Shares, Issued |  |  | 7,563,600 us-gaap_CommonStockSharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember
Common Class B [Member] |  |  |
Class of Stock [Line Items] |  |  |
Common Stock, Shares Authorized | 30,000,000 us-gaap_CommonStockSharesAuthorized / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember | 30,000,000 us-gaap_CommonStockSharesAuthorized / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember | 30,000,000 us-gaap_CommonStockSharesAuthorized / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember
Common Stock, Par or Stated Value Per Share | $ 0.10 us-gaap_CommonStockParOrStatedValuePerShare / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember | $ 0.10 us-gaap_CommonStockParOrStatedValuePerShare / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember |
Common Stock, Shares, Issued |  |  | 1,436,400 us-gaap_CommonStockSharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember

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