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Investment in Corporate Securities (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Investment in Corporate Securities  
Proceeds from finalization of bankruptcy proceedings $ 6,870us-gaap_ProceedsFromSaleOfAvailableForSaleSecuritiesDebt
Realized gain on finalization of bankruptcy proceedings $ 1,516us-gaap_AvailableforsaleSecuritiesGrossRealizedGainLossExcludingOtherThanTemporaryImpairments