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Notes and Loan Payable and Amounts Due Under Repurchase Agreements (Schedule of Notes and Loan Payable) (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Sep. 30, 2016
Dec. 31, 2015
Jul. 17, 2013
Debt Instrument [Line Items]        
Notes and loan payable $ 493,755   $ 393,227  
July 2021 Notes [Member]        
Debt Instrument [Line Items]        
Debt instrument, face amount 400,000   400,000 $ 400,000
Unamortized debt issue costs (5,733)   (6,773)  
Term Loan [Member]        
Debt Instrument [Line Items]        
Debt instrument, face amount 100,000 $ 100,000 0  
Unamortized debt issue costs $ (512)   $ 0