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Related Party Transactions (Details)
$ in Thousands, £ in Millions
1 Months Ended 3 Months Ended
Jun. 30, 2018
USD ($)
Jun. 30, 2018
GBP (£)
May 31, 2018
USD ($)
Sep. 30, 2017
USD ($)
Jun. 30, 2017
USD ($)
Mar. 31, 2019
USD ($)
Mar. 31, 2018
USD ($)
Dec. 31, 2018
USD ($)
Related Party Transaction [Line Items]                
Related party expenses           $ 9,613 $ 8,092  
Base management fees incurred but not yet paid           9,613   $ 9,804
Commercial mortgage loans and subordinate loans, net           $ 5,186,999   4,927,593
Limited Liability Company [Member]                
Related Party Transaction [Line Items]                
Rate of management fees           1.50%    
Extension period           1 year    
Period of termination           180 days    
Termination fee calculation period           24 months    
Limited Liability Company [Member] | Management Fees [Member]                
Related Party Transaction [Line Items]                
Base management fees incurred but not yet paid           $ 9,600   9,800
Affiliated Entity [Member] | Management Fees [Member]                
Related Party Transaction [Line Items]                
Related party expenses           9,600 8,100  
Affiliated Entity [Member] | Reimbursements [Member]                
Related Party Transaction [Line Items]                
Related party expenses           700 600  
Commercial Mortgage Portfolio Segment [Member]                
Related Party Transaction [Line Items]                
Commercial mortgage loans and subordinate loans, net           $ 4,003,089   $ 3,878,981
Commercial Mortgage Portfolio Segment [Member] | Affiliated Entity [Member]                
Related Party Transaction [Line Items]                
Payments to acquire loans receivable $ 6,400 £ 4.8 $ 28,200 $ 25,000 $ 25,000      
Commercial mortgage loans and subordinate loans, net     $ 300,000   $ 100,000   $ 125,000