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Debt Obligations - Summary (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Debt Obligations    
Outstanding Balance $ 589,262 $ 571,872
Weighted Average    
Debt Obligations    
Applicable Interest Rate (as a percent) 4.19%  
Bank Borrowings - Line of Credit    
Debt Obligations    
Outstanding Balance $ 77,000 120,500
Available for Borrowing $ 523,000 479,500
Bank Borrowings - Line of Credit | Weighted Average    
Debt Obligations    
Applicable Interest Rate (as a percent) 2.20%  
Senior Unsecured Debt    
Debt Obligations    
Outstanding Balance $ 512,262 451,372
Available for Borrowing $ 12,500 $ 33,333
Senior Unsecured Debt | Weighted Average    
Debt Obligations    
Applicable Interest Rate (as a percent) 4.49%