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Debt Obligations - Senior Unsecured Notes, Net (Details) - USD ($)
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Debt Obligations    
Proceeds from issuance of senior unsecured notes $ 100,000,000  
Payments on debt 4,167,000 $ 4,167,000
Private Shelf Agreement Prudential | Senior Unsecured Notes    
Debt Obligations    
Maximum available under facility $ 337,500,000  
Debt instrument term 15 years  
Proceeds from issuance of senior unsecured notes $ 100,000,000  
Fixed interest rate (as a percent) 4.50%  
Payments on debt $ 4,167,000 $ 4,167,000