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Revenue Recognition - Advisory Agreements (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
RIF          
Related Party Transaction [Line Items]          
Advisory fee percent       0.85%  
Tremont Advisors          
Related Party Transaction [Line Items]          
Business management fee percent based on management agreements       1.50%  
Minimum | Tremont Advisors          
Related Party Transaction [Line Items]          
Advisory fee percentage based on aggregate principal amounts of loan originate       0.50%  
Maximum | Tremont Advisors          
Related Party Transaction [Line Items]          
Advisory fee percentage based on aggregate principal amounts of loan originate       1.00%  
Forecast | Tremont Advisors          
Related Party Transaction [Line Items]          
Advisory fee percent 20.00%        
Advisory fee percentage 7.00%        
Advisory services          
Related Party Transaction [Line Items]          
Revenue   $ 1,045 $ 1,019 $ 3,492 $ 3,033
Advisory services | RMR Advisors and Tremont Advisors          
Related Party Transaction [Line Items]          
Revenue   706 613 2,134 1,826
Advisory services | Tremont Advisors          
Related Party Transaction [Line Items]          
Revenue   339 406 1,358 1,207
Management services          
Related Party Transaction [Line Items]          
Revenue   47,328 44,644 142,457 130,629
Management services | Tremont Advisors          
Related Party Transaction [Line Items]          
Revenue   $ 194 $ 113 $ 582 $ 352