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Consolidated Financial Statements (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Sale price $ 26,373us-gaap_SaleLeasebackTransactionGrossProceedsInvestingActivities
Period of lease 5 years
Net present value of future minimum lease payments 5,765us-gaap_PresentValueOfFutureMinimumLeasePaymentsSaleLeasebackTransactions
Deferred gain on sale 13,144us-gaap_SaleLeasebackTransactionDeferredGainGross
Recognized gain exceeding fair value 7,379us-gaap_SaleLeasebackTransactionCurrentPeriodGainRecognized
Minimum lease payment, year one 1,378us-gaap_MinimumLeasePaymentsSaleLeasebackTransactionsWithinOneYear
Minimum lease payment, year two 1,378us-gaap_MinimumLeasePaymentsSaleLeasebackTransactionsWithinTwoYears
Minimum lease payment, year three 1,378us-gaap_MinimumLeasePaymentsSaleLeasebackTransactionsWithinThreeYears
Minimum lease payment, year four 1,378us-gaap_MinimumLeasePaymentsSaleLeasebackTransactionsWithinFourYears
Minimum lease payment, year five $ 1,378us-gaap_MinimumLeasePaymentsSaleLeasebackTransactionsWithinFiveYears