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Subsequent Events (Details) - USD ($)
$ in Thousands
Oct. 20, 2017
Sep. 30, 2017
Dec. 31, 2016
Subsequent Event [Line Items]      
Loan outstanding balance   $ 1,115,795 $ 898,023
Subsequent event | Senior secured credit facilities with syndicate of various lenders | Secured debt      
Subsequent Event [Line Items]      
Loan outstanding balance $ 303,000    
Subsequent event | Senior secured credit facilities with syndicate of various lenders | Senior delayed draw term loan facility      
Subsequent Event [Line Items]      
Line of credit, maximum borrowing capacity 234,500    
Subsequent event | Senior secured credit facilities with syndicate of various lenders | Senior Secured Credit Facility | Subordinated debt      
Subsequent Event [Line Items]      
Line of credit, maximum borrowing capacity 58,500    
Subsequent event | Senior secured credit facilities with syndicate of various lenders | Senior Secured Credit Facility | Debt service reserve letter      
Subsequent Event [Line Items]      
Line of credit, maximum borrowing capacity $ 10,000    
Subsequent event | Senior secured credit facilities with syndicate of various lenders | Senior secured credit facility, initial | Subordinated debt      
Subsequent Event [Line Items]      
Percentage of outstanding debt 30.00%    
Subsequent event | Senior secured credit facilities with syndicate of various lenders | Senior secured credit facility, remaining | Subordinated debt      
Subsequent Event [Line Items]      
Percentage of outstanding debt 70.00%    
Subsequent event | Senior secured credit facilities with syndicate of various lenders | London Interbank Offered Rate (LIBOR) | Senior delayed draw term loan facility      
Subsequent Event [Line Items]      
Annual contractual interest rate 2.75%    
Debt instrument, variable rate periodic increase 3.00%    
Subsequent event | Senior secured credit facilities with syndicate of various lenders | London Interbank Offered Rate (LIBOR) | Senior secured credit facility, initial | Subordinated debt      
Subsequent Event [Line Items]      
Annual contractual interest rate 5.00%    
Subsequent event | Senior secured credit facilities with syndicate of various lenders | London Interbank Offered Rate (LIBOR) | Senior secured credit facility, remaining | Subordinated debt      
Subsequent Event [Line Items]      
Annual contractual interest rate 7.03%