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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, 2017
Jun. 16, 2017
Dec. 31, 2016
Jul. 17, 2013
Debt Instrument [Line Items]        
Notes and loan payable $ 494,093   $ 493,755  
June 2027 Notes [Member]        
Debt Instrument [Line Items]        
Debt instrument, face amount 500,000 $ 500,000 0  
Unamortized debt issue costs (5,572)   0  
Unamortized debt issue costs (335) $ (300) 0  
July 2021 Notes [Member]        
Debt Instrument [Line Items]        
Debt instrument, face amount 0   400,000 $ 400,000
Unamortized debt issue costs 0   (5,733)  
Term Loan [Member]        
Debt Instrument [Line Items]        
Debt instrument, face amount 0   100,000  
Unamortized debt issue costs $ 0   $ (512)