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Commercial Mortgage and Subordinate Loans, Net - Schedule of Mortgage Loans by Property Type and Geographic Distribution (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Loans and Leases Receivable Disclosure [Line Items]    
Carrying value $ 4,927,593 $ 3,679,758
% of Portfolio 100.00% 100.00%
Hotel [Member]    
Loans and Leases Receivable Disclosure [Line Items]    
Carrying value $ 1,286,590 $ 645,056
% of Portfolio 26.10% 17.60%
Residential-for Sale [Member]    
Loans and Leases Receivable Disclosure [Line Items]    
Carrying value   $ 442,200
Residential-for-sale: inventory [Member]    
Loans and Leases Receivable Disclosure [Line Items]    
Carrying value $ 577,053 $ 92,438
% of Portfolio 11.70% 2.50%
Residential-for-sale: construction [Member]    
Loans and Leases Receivable Disclosure [Line Items]    
Carrying value $ 528,510 $ 349,739
% of Portfolio 10.70% 9.50%
Office [Member]    
Loans and Leases Receivable Disclosure [Line Items]    
Carrying value $ 832,620 $ 513,830
% of Portfolio 16.90% 14.00%
Urban Predevelopment [Member]    
Loans and Leases Receivable Disclosure [Line Items]    
Carrying value $ 683,886 $ 654,736
% of Portfolio 13.90% 17.80%
Multifamily [Member]    
Loans and Leases Receivable Disclosure [Line Items]    
Carrying value $ 448,899 $ 465,057
% of Portfolio 9.10% 12.60%
Healthcare [Member]    
Loans and Leases Receivable Disclosure [Line Items]    
Carrying value $ 156,814 $ 173,870
% of Portfolio 3.20% 4.70%
Retail Center [Member]    
Loans and Leases Receivable Disclosure [Line Items]    
Carrying value $ 156,067 $ 198,913
% of Portfolio 3.20% 5.40%
Other [Member]    
Loans and Leases Receivable Disclosure [Line Items]    
Carrying value $ 151,197 $ 154,141
% of Portfolio 3.10% 4.20%
Mixed Use [Member]    
Loans and Leases Receivable Disclosure [Line Items]    
Carrying value $ 73,957 $ 354,640
% of Portfolio 1.50% 9.60%
Industrial [Member]    
Loans and Leases Receivable Disclosure [Line Items]    
Carrying value $ 32,000 $ 77,338
% of Portfolio 0.60% 2.10%
Manhattan, NY [Member]    
Loans and Leases Receivable Disclosure [Line Items]    
Carrying value $ 1,669,145 $ 1,173,833
% of Portfolio 33.90% 31.90%
Brooklyn, NY [Member]    
Loans and Leases Receivable Disclosure [Line Items]    
Carrying value $ 346,056 $ 357,611
% of Portfolio 7.00% 9.70%
Northeast [Member]    
Loans and Leases Receivable Disclosure [Line Items]    
Carrying value $ 23,479 $ 100,536
% of Portfolio 0.50% 2.70%
Midwest [Member]    
Loans and Leases Receivable Disclosure [Line Items]    
Carrying value $ 631,710 $ 683,380
% of Portfolio 12.80% 18.60%
West [Member]    
Loans and Leases Receivable Disclosure [Line Items]    
Carrying value $ 614,160 $ 227,024
% of Portfolio 12.50% 6.20%
Southeast [Member]    
Loans and Leases Receivable Disclosure [Line Items]    
Carrying value $ 559,043 $ 531,582
% of Portfolio 11.30% 14.40%
Mid Atlantic [Member]    
Loans and Leases Receivable Disclosure [Line Items]    
Carrying value $ 211,775 $ 191,976
% of Portfolio 4.30% 5.20%
Southwest [Member]    
Loans and Leases Receivable Disclosure [Line Items]    
Carrying value $ 96,345 $ 33,615
% of Portfolio 2.00% 0.90%
UNITED KINGDOM    
Loans and Leases Receivable Disclosure [Line Items]    
Carrying value $ 700,460 $ 303,488
% of Portfolio 14.20% 8.30%
Other International [Member]    
Loans and Leases Receivable Disclosure [Line Items]    
Carrying value $ 75,420 $ 76,713
% of Portfolio 1.50% 2.10%