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Notes and Loan Payable and Amounts Due Under Repurchase Agreements (2027 Notes Narrative) (Details) - USD ($)
$ in Thousands
Jul. 17, 2017
Jun. 16, 2017
Jun. 30, 2017
Dec. 31, 2016
June 2027 Notes [Member]        
Debt Instrument [Line Items]        
Debt instrument, face amount   $ 500,000 $ 500,000 $ 0
Interest rate   5.00%    
Unamortized discount   $ 300 $ 349 $ 0
Debt financing costs   5,800    
Term Loan [Member]        
Debt Instrument [Line Items]        
Extinguishment of debt, amount   $ 100,000    
Subsequent Event [Member] | July 2021 Notes [Member]        
Debt Instrument [Line Items]        
Extinguishment of debt, amount $ 400,000