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Debt Obligations - By Component (Details) - USD ($)
1 Months Ended 9 Months Ended
Oct. 31, 2018
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Debt Obligations        
Outstanding Balance   $ 670,986,000   $ 667,502,000
Available for borrowing   559,833,000   567,167,000
Proceeds from debt     $ 100,000,000  
Payments on debt   $ 93,166,000 $ 135,767,000  
Weighted Average        
Debt Obligations        
Applicable Interest Rate (as a percent)   4.29%    
Bank Borrowings        
Debt Obligations        
Outstanding Balance   $ 120,000,000   96,500,000
Available for borrowing   $ 480,000,000   503,500,000
Bank Borrowings | Weighted Average        
Debt Obligations        
Applicable Interest Rate (as a percent)   3.38%    
Senior Unsecured Notes        
Debt Obligations        
Outstanding Balance   $ 550,986,000   571,002,000
Available for borrowing   $ 79,833,000   $ 63,667,000
Senior Unsecured Notes | Weighted Average        
Debt Obligations        
Applicable Interest Rate (as a percent)   4.49%    
Subsequent Event | Bank Borrowings        
Debt Obligations        
Outstanding Balance $ 100,000,000      
Available for borrowing 500,000,000      
Payments on debt $ 20,000,000