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Debt Obligations - By Component (Details) - USD ($)
$ in Thousands
1 Months Ended 6 Months Ended
Jul. 31, 2017
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Debt Obligations        
Outstanding Balance   $ 642,898   $ 609,391
Available for borrowing   591,667   515,400
Amount borrowed   48,500 $ 77,500  
Payments on debt   $ 4,167 $ 4,167  
Weighted Average        
Debt Obligations        
Applicable Interest Rate (as a percent)   4.37%    
Bank Borrowings        
Debt Obligations        
Outstanding Balance   $ 45,000   107,100
Available for borrowing   $ 555,000   492,900
Bank Borrowings | Weighted Average        
Debt Obligations        
Applicable Interest Rate (as a percent)   2.66%    
Senior Unsecured Notes        
Debt Obligations        
Outstanding Balance   $ 597,898   502,291
Available for borrowing   $ 36,667   $ 22,500
Senior Unsecured Notes | Weighted Average        
Debt Obligations        
Applicable Interest Rate (as a percent)   4.50%    
Subsequent Event | Bank Borrowings        
Debt Obligations        
Outstanding Balance $ 50,000      
Available for borrowing 550,000      
Amount borrowed 5,000      
Subsequent Event | Senior Unsecured Notes        
Debt Obligations        
Outstanding Balance 587,898      
Available for borrowing 46,667      
Payments on debt $ 10,000