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Notes and Loan Payable and Amounts Due Under Repurchase Agreements (Schedule of Notes and Loan Payable) (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Jun. 16, 2017
Dec. 31, 2016
Debt Instrument [Line Items]      
Notes and loan payable $ 888,660   $ 493,755
July 2021 Notes [Member]      
Debt Instrument [Line Items]      
Debt instrument, face amount 400,000   400,000
Unamortized debt issue costs (5,187)   (5,733)
June 2027 Notes [Member]      
Debt Instrument [Line Items]      
Debt instrument, face amount 500,000 $ 500,000 0
Unamortized debt issue costs (5,804)   0
Unamortized discount (349) $ (300) 0
Term Loan [Member]      
Debt Instrument [Line Items]      
Debt instrument, face amount 0   100,000
Unamortized debt issue costs $ 0   $ (512)