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Commercial Mortgage and Subordinate Loans, Net - Allocation of Carrying Value of Loan Portfolio Based on Internal Risk Ratings (Details)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2019
USD ($)
loan
Dec. 31, 2018
USD ($)
loan
Financing Receivable, Credit Quality Indicator [Line Items]    
Number of Loans | loan 71 69
Carrying value | $ $ 5,443,744 $ 4,927,593
% of Portfolio 100.00% 100.00%
Weighted-average risk rating 3.0 3.1
1    
Financing Receivable, Credit Quality Indicator [Line Items]    
Number of Loans | loan 0 0
Carrying value | $ $ 0 $ 0
% of Portfolio 0.00% 0.00%
2    
Financing Receivable, Credit Quality Indicator [Line Items]    
Number of Loans | loan 3 3
Carrying value | $ $ 253,817 $ 138,040
% of Portfolio 5.00% 3.00%
3    
Financing Receivable, Credit Quality Indicator [Line Items]    
Number of Loans | loan 66 63
Carrying value | $ $ 5,010,351 $ 4,573,930
% of Portfolio 92.00% 93.00%
4    
Financing Receivable, Credit Quality Indicator [Line Items]    
Number of Loans | loan 0 0
Carrying value | $ $ 0 $ 0
% of Portfolio 0.00% 0.00%
5    
Financing Receivable, Credit Quality Indicator [Line Items]    
Number of Loans | loan 2 3
Carrying value | $ $ 179,576 $ 215,623
% of Portfolio 3.00% 4.00%