XML 53 R42.htm IDEA: XBRL DOCUMENT v3.10.0.1
Debt Obligations - By Component (Details) - USD ($)
1 Months Ended 6 Months Ended
Jul. 31, 2018
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Debt Obligations        
Outstanding Balance   $ 652,440,000   $ 667,502,000
Available for borrowing   582,333,000   567,167,000
Proceeds from debt     $ 100,000,000  
Payments on debt   $ 69,166,000 $ 114,767,000  
Weighted Average        
Debt Obligations        
Applicable Interest Rate (as a percent)   4.33%    
Bank Borrowings        
Debt Obligations        
Outstanding Balance   $ 85,500,000   96,500,000
Available for borrowing   $ 514,500,000   503,500,000
Bank Borrowings | Weighted Average        
Debt Obligations        
Applicable Interest Rate (as a percent)   3.26%    
Senior Unsecured Notes        
Debt Obligations        
Outstanding Balance   $ 566,940,000   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 $ 100,000,000      
Available for borrowing 500,000,000      
Proceeds from debt 14,500,000      
Subsequent Event | Senior Unsecured Notes        
Debt Obligations        
Outstanding Balance 552,940,000      
Available for borrowing 77,833,000      
Payments on debt $ 14,000,000