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Commercial Mortgage, Subordinate Loans and Other Lending Assets, Net - Schedule of Mortgage Loans by Property Type and Geographic Distribution (Details) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2019
Dec. 31, 2018
Loans and Leases Receivable Disclosure [Line Items]    
Carrying value $ 6,114,574 $ 4,927,593
% of Portfolio 100.00% 100.00%
Hotel    
Loans and Leases Receivable Disclosure [Line Items]    
Carrying value $ 1,579,667 $ 1,286,590
% of Portfolio 25.80% 26.10%
Residential-for-sale: construction    
Loans and Leases Receivable Disclosure [Line Items]    
Carrying value $ 629,069 $ 528,510
% of Portfolio 10.30% 10.70%
Residential-for-sale: inventory    
Loans and Leases Receivable Disclosure [Line Items]    
Carrying value $ 349,259 $ 577,053
% of Portfolio 5.70% 11.70%
Office    
Loans and Leases Receivable Disclosure [Line Items]    
Carrying value $ 1,406,678 $ 832,620
% of Portfolio 23.00% 16.90%
Urban Predevelopment    
Loans and Leases Receivable Disclosure [Line Items]    
Carrying value $ 602,946 $ 683,886
% of Portfolio 9.90% 13.90%
Urban Retail    
Loans and Leases Receivable Disclosure [Line Items]    
Carrying value $ 466,343 $ 0
% of Portfolio 7.60% 0.00%
Multifamily    
Loans and Leases Receivable Disclosure [Line Items]    
Carrying value $ 306,142 $ 448,899
% of Portfolio 5.00% 9.10%
Industrial    
Loans and Leases Receivable Disclosure [Line Items]    
Carrying value $ 227,696 $ 32,000
% of Portfolio 3.70% 0.60%
Retail Center    
Loans and Leases Receivable Disclosure [Line Items]    
Carrying value $ 126,068 $ 156,067
% of Portfolio 2.10% 3.20%
Healthcare    
Loans and Leases Receivable Disclosure [Line Items]    
Carrying value $ 190,832 $ 156,814
% of Portfolio 3.10% 3.20%
Other    
Loans and Leases Receivable Disclosure [Line Items]    
Carrying value $ 127,229 $ 151,197
% of Portfolio 2.10% 3.10%
Mixed Use    
Loans and Leases Receivable Disclosure [Line Items]    
Carrying value $ 102,645 $ 73,957
% of Portfolio 1.70% 1.50%
Manhattan, NY    
Loans and Leases Receivable Disclosure [Line Items]    
Carrying value $ 2,286,709 $ 1,669,145
% of Portfolio 37.40% 33.90%
Brooklyn, NY    
Loans and Leases Receivable Disclosure [Line Items]    
Carrying value $ 443,966 $ 346,056
% of Portfolio 7.30% 7.00%
Northeast    
Loans and Leases Receivable Disclosure [Line Items]    
Carrying value $ 19,195 $ 23,479
% of Portfolio 0.30% 0.50%
West    
Loans and Leases Receivable Disclosure [Line Items]    
Carrying value $ 728,788 $ 614,160
% of Portfolio 11.90% 12.50%
Midwest    
Loans and Leases Receivable Disclosure [Line Items]    
Carrying value $ 626,867 $ 631,710
% of Portfolio 10.30% 12.80%
Southeast    
Loans and Leases Receivable Disclosure [Line Items]    
Carrying value $ 568,103 $ 559,043
% of Portfolio 9.30% 11.30%
Southwest    
Loans and Leases Receivable Disclosure [Line Items]    
Carrying value $ 126,506 $ 96,345
% of Portfolio 2.10% 2.00%
Mid Atlantic    
Loans and Leases Receivable Disclosure [Line Items]    
Carrying value $ 110,895 $ 211,775
% of Portfolio 1.80% 4.30%
United Kingdom    
Loans and Leases Receivable Disclosure [Line Items]    
Carrying value $ 815,168 $ 700,460
% of Portfolio 13.30% 14.20%
Germany    
Loans and Leases Receivable Disclosure [Line Items]    
Carrying value $ 185,208 $ 0
% of Portfolio 3.00% 0.00%
Italy    
Loans and Leases Receivable Disclosure [Line Items]    
Carrying value $ 129,524 $ 0
% of Portfolio 2.10% 0.00%
Other International    
Loans and Leases Receivable Disclosure [Line Items]    
Carrying value $ 73,645 $ 75,420
% of Portfolio 1.20% 1.50%