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Notes Payable and Amounts Due Under Repurchase Agreements (Schedule of Notes Payable) (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Jun. 16, 2017
Debt Instrument [Line Items]      
Notes payable $ 494,339 $ 494,093  
June 2027 Notes [Member]      
Debt Instrument [Line Items]      
Debt instrument, face amount 500,000 500,000 $ 500,000
Unamortized debt issue costs (5,340) (5,572)  
Unamortized discount $ (321) $ (335) $ (300)