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Notes and Loan Payable and Amounts Due Under Repurchase Agreements (Schedule of Notes and Loan Payable) (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Debt Instrument [Line Items]    
Notes and loan payable $ 494,071 $ 493,755
July 2021 Notes [Member]    
Debt Instrument [Line Items]    
Debt instrument, face amount 400,000 400,000
Unamortized debt issue costs (5,463) (5,733)
Term Loan [Member]    
Debt Instrument [Line Items]    
Debt instrument, face amount 100,000 100,000
Unamortized debt issue costs $ (466) $ (512)