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Commercial Mortgage, Subordinate Loans and Other Lending Assets, Net - Additional Information (Details)
$ in Thousands, £ in Millions
1 Months Ended 3 Months Ended 12 Months Ended
Jan. 31, 2020
USD ($)
Jan. 31, 2020
GBP (£)
Mar. 31, 2020
USD ($)
Mar. 31, 2019
USD ($)
Dec. 31, 2019
USD ($)
Financing Receivable, Allowance for Credit Loss [Line Items]          
Percentage of loan portfolio     100.00%   100.00%
Increase in General CECL Allowance     $ 33,500    
Interest receivable     41,860   $ 35,581
Amortized cost of loans in cost recovery     536,206   $ 136,300
Interest received for loans in cost recovery     600    
Payment in kind interest     12,400 $ 14,500  
Proceeds from pre-payment penalties or accelerated fees     200 $ 3,700  
Subordinate Mortgage Portfolio Segment          
Financing Receivable, Allowance for Credit Loss [Line Items]          
Maximum exposure to loss     $ 68,100    
Maximum exposure to loss, term     6 years 6 months 25 days    
Floating Rate Loan          
Financing Receivable, Allowance for Credit Loss [Line Items]          
Percentage of loan portfolio     95.00%   95.00%
Sale of mezzanine loan          
Financing Receivable, Allowance for Credit Loss [Line Items]          
Proceeds from sale of loan $ 81,300 £ 62.2      
Sale of unfunded commitment of senior mortgage          
Financing Receivable, Allowance for Credit Loss [Line Items]          
Proceeds from sale of loan $ 65,300 £ 50.0