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Debt Obligations - By Component (Details) - USD ($)
1 Months Ended 3 Months Ended
Apr. 30, 2018
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Debt Obligations        
Outstanding Balance   $ 687,388,000   $ 667,502,000
Available for borrowing   547,333,000   567,167,000
Payments on debt   $ 4,166,000 $ 4,167,000  
Weighted Average        
Debt Obligations        
Applicable Interest Rate (as a percent)   4.27%    
Bank Borrowings        
Debt Obligations        
Outstanding Balance   $ 120,500,000   96,500,000
Available for borrowing   $ 479,500,000   503,500,000
Bank Borrowings | Weighted Average        
Debt Obligations        
Applicable Interest Rate (as a percent)   3.21%    
Senior Unsecured Notes        
Debt Obligations        
Outstanding Balance   $ 566,888,000   571,002,000
Available for borrowing   $ 67,833,000   $ 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 $ 55,500,000      
Available for borrowing 544,500,000      
Payments on debt $ 65,000,000