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Commercial Mortgage and Subordinate Loans, Net - Additional Information (Details)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2019
USD ($)
$ / ft²
Dec. 31, 2018
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2019
USD ($)
$ / ft²
Jun. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2016
USD ($)
Mar. 31, 2018
Financing Receivable, Allowance for Credit Loss [Line Items]                  
Percentage of loan portfolio         100.00%   100.00%    
(Reversal of) Provision for loan losses and impairments $ (15,000)   $ 5,000   $ (15,000) $ 5,000      
Carrying value 5,443,744 $ 4,927,593     5,443,744   $ 4,927,593    
Payment in kind interest 14,600   9,100   29,100 19,700      
Proceeds from pre-payment penalties or accelerated fees 0   1,600   3,700 $ 1,600      
Commercial Mortgage and Subordinated Portfolio Segment                  
Financing Receivable, Allowance for Credit Loss [Line Items]                  
(Reversal of) Provision for loan losses and impairments (15,000)       (15,000)        
Amortized cost of the loan 5,443,744 4,927,593     5,443,744   4,927,593    
Loan loss provision and impairment         22,000   37,000    
Loss on sale of underlying collateral 12,500       12,513        
Commercial Mortgage Portfolio Segment                  
Financing Receivable, Allowance for Credit Loss [Line Items]                  
Carrying value 4,206,754 3,878,981     4,206,754   3,878,981    
Subordinate Mortgage Portfolio Segment                  
Financing Receivable, Allowance for Credit Loss [Line Items]                  
Carrying value 1,236,990 1,048,612     1,236,990   1,048,612    
Retail Center - Cincinnati, OH | Commercial Mortgage Portfolio Segment                  
Financing Receivable, Allowance for Credit Loss [Line Items]                  
(Reversal of) Provision for loan losses and impairments   15,000              
Amortized cost of the loan 158,100 156,100     158,100   156,100    
Residential Condominium - Bethesda, MD | Commercial Mortgage and Subordinated Portfolio Segment                  
Financing Receivable, Allowance for Credit Loss [Line Items]                  
(Reversal of) Provision for loan losses and impairments     $ 5,000 $ 2,000          
Amortized cost of the loan 21,500 27,200     21,500   27,200    
Loan loss provision and impairment         10,000        
Impairment       $ 3,000          
Multifamily - Williston, ND | Commercial Mortgage and Subordinated Portfolio Segment                  
Financing Receivable, Allowance for Credit Loss [Line Items]                  
Amortized cost of the loan   32,400         32,400    
Multifamily - Williston, ND | Commercial Mortgage Portfolio Segment                  
Financing Receivable, Allowance for Credit Loss [Line Items]                  
(Reversal of) Provision for loan losses and impairments               $ 10,000  
Multifamily - Williston, ND | Subordinate Mortgage Portfolio Segment                  
Financing Receivable, Allowance for Credit Loss [Line Items]                  
(Reversal of) Provision for loan losses and impairments               $ 5,000  
Office Campus - Renton, WA | Subordinate Mortgage Portfolio Segment                  
Financing Receivable, Allowance for Credit Loss [Line Items]                  
Proceeds from sale of loan             75,000    
Proceeds from sale of loan, amount funded             17,700    
Carrying value   265,000         $ 265,000    
Exposure to mortgage loan 190,000       190,000        
Exposure to mortgage loan, amount funded $ 108,000       $ 108,000        
Floating Rate Loan                  
Financing Receivable, Allowance for Credit Loss [Line Items]                  
Percentage of loan portfolio         93.00%   91.00%    
Net operating income | Retail Center - Cincinnati, OH | Commercial Mortgage Portfolio Segment                  
Financing Receivable, Allowance for Credit Loss [Line Items]                  
Loan collateral   $ 10,500         $ 10,500    
Capitalization rate | Retail Center - Cincinnati, OH | Commercial Mortgage Portfolio Segment                  
Financing Receivable, Allowance for Credit Loss [Line Items]                  
Loan collateral, measurement input   0.068 0.068     0.068 0.068    
Dollars per square foot | Residential Condominium - Bethesda, MD | Commercial Mortgage Portfolio Segment                  
Financing Receivable, Allowance for Credit Loss [Line Items]                  
Loan collateral, measurement input | $ / ft² 662       662        
Discount rate | Commercial Mortgage Portfolio Segment                  
Financing Receivable, Allowance for Credit Loss [Line Items]                  
Loan collateral, measurement input               0.10  
Discount rate | Residential Condominium - Bethesda, MD | Commercial Mortgage Portfolio Segment                  
Financing Receivable, Allowance for Credit Loss [Line Items]                  
Loan collateral, measurement input 0.15       0.15        
Terminal capitalization rate | Commercial Mortgage Portfolio Segment                  
Financing Receivable, Allowance for Credit Loss [Line Items]                  
Loan collateral, measurement input               0.11  
Contractual Interest Rate Reduction | Retail Center - Cincinnati, OH | Commercial Mortgage Portfolio Segment                  
Financing Receivable, Allowance for Credit Loss [Line Items]                  
Unpaid principal balance of loan restructured     $ 171,200     $ 171,200      
Contractual Interest Rate Reduction | London Interbank Offered Rate (LIBOR) | Retail Center - Cincinnati, OH | Commercial Mortgage Portfolio Segment                  
Financing Receivable, Allowance for Credit Loss [Line Items]                  
Basis spread on variable rate     3.00%     3.00%     5.50%