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Credit Facilities - Credit Facility (Details) - Credit Facility - KeyBank National Association - Unsecured debt
Jul. 02, 2018
USD ($)
Jul. 24, 2017
USD ($)
extension
Sep. 30, 2018
EUR (€)
Sep. 30, 2018
USD ($)
Jun. 30, 2018
USD ($)
Line of Credit Facility [Line Items]          
Maximum borrowing capacity (up to) $ 914,400,000 $ 725,000,000     $ 722,200,000
Increase in aggregate commitments (up to) 35,631,000        
Total line of credit commitment 950,000,000        
Number of extensions (extension) | extension   1      
Extension term   1 year      
Weighted-average effective interest rate     3.00% 3.00%  
Available for future borrowings       $ 7,000,000  
Federal Funds          
Line of Credit Facility [Line Items]          
Interest rate spread   0.50%      
LIBOR          
Line of Credit Facility [Line Items]          
Interest rate spread   1.00%      
LIBOR | Minimum          
Line of Credit Facility [Line Items]          
Interest rate spread   1.60%      
LIBOR | Maximum          
Line of Credit Facility [Line Items]          
Interest rate spread   2.20%      
Base Rate | Minimum          
Line of Credit Facility [Line Items]          
Interest rate spread   0.60%      
Base Rate | Maximum          
Line of Credit Facility [Line Items]          
Interest rate spread   1.20%      
Revolving Credit Facility          
Line of Credit Facility [Line Items]          
Maximum borrowing capacity (up to)       632,000,000  
Increase in maximum borrowing capacity 132,000,000        
Facility fee multiplier   0.003      
Revolving Credit Facility | Above Threshold          
Line of Credit Facility [Line Items]          
Unused capacity commitment fee   0.25%      
Commitment fee percentage   50.00%      
Revolving Credit Facility | Below Threshold          
Line of Credit Facility [Line Items]          
Unused capacity commitment fee   0.15%      
Commitment fee percentage   50.00%      
Term Facility          
Line of Credit Facility [Line Items]          
Maximum borrowing capacity (up to)     € 246,481,489.42 $ 286,764,698.68037886  
Increase in maximum borrowing capacity $ 60,200,000