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Notes Payable and Amounts Due Under Repurchase Agreements (Liability and Equity Components of Convertible Senior Notes) (Details) - September 2015 Notes [Member]
$ in Thousands
12 Months Ended
Dec. 31, 2014
USD ($)
Debt Instrument [Line Items]  
Principal amount of liability component $ 22,377
Unamortized discount (698)
Net carrying amount of liability component 21,679
Amount by which the if-converted value exceeds principal $ 30,497