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Subsequent Events - Debt Obligations (Details) - USD ($)
$ in Thousands
1 Months Ended 9 Months Ended
Oct. 31, 2017
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Debt Obligations        
Amount borrowed   $ 64,500 $ 83,500  
Outstanding Balance   637,950   $ 609,391
Available for borrowing   596,667   515,400
Bank Borrowings        
Debt Obligations        
Outstanding Balance   55,000   107,100
Available for borrowing   $ 545,000   $ 492,900
Bank Borrowings | Subsequent Event        
Debt Obligations        
Amount borrowed $ 15,000      
Outstanding Balance 70,000      
Available for borrowing $ 530,000