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Debt Obligations (Details) - USD ($)
6 Months Ended 13 Months Ended
May 17, 2017
Jun. 30, 2017
May 16, 2017
Dec. 31, 2016
Credit Facility [Line Items]        
Credit facility, maximum borrowing capacity $ 375,000,000      
Credit facility borrowings   $ 173,192,000   $ 100,000,000
Revolving Credit Facility        
Credit Facility [Line Items]        
Credit facility, term 4 years   3 years  
Credit facility, maximum borrowing capacity $ 250,000,000   $ 200,000,000  
Credit facility, commitment fee rate   0.35%    
Credit facility borrowings   $ 175,000,000    
Weighted average interest during period   3.21%    
Term Loan        
Credit Facility [Line Items]        
Credit facility, maximum borrowing capacity 125,000,000      
Uncommited Line        
Credit Facility [Line Items]        
Credit facility, maximum borrowing capacity $ 75,000,000