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Commercial Mortgage and Subordinate Loans, Net - Schedule of Mortgage Loans by Property Type and Geographic Distribution (Details) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2018
Dec. 31, 2017
Loans and Leases Receivable Disclosure [Line Items]    
Carrying value $ 4,828,046 $ 3,679,758
% of Portfolio 100.00% 100.00%
Hotel [Member]    
Loans and Leases Receivable Disclosure [Line Items]    
Carrying value $ 1,229,460 $ 645,056
% of Portfolio 25.50% 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 $ 602,826 $ 92,438
% of Portfolio 12.50% 2.50%
Residential-for-sale: construction [Member]    
Loans and Leases Receivable Disclosure [Line Items]    
Carrying value $ 385,303 $ 349,739
% of Portfolio 8.00% 9.50%
Urban Predevelopment [Member]    
Loans and Leases Receivable Disclosure [Line Items]    
Carrying value $ 677,440 $ 654,736
% of Portfolio 14.00% 17.80%
Office [Member]    
Loans and Leases Receivable Disclosure [Line Items]    
Carrying value $ 520,926 $ 513,830
% of Portfolio 10.80% 14.00%
Multifamily [Member]    
Loans and Leases Receivable Disclosure [Line Items]    
Carrying value $ 450,017 $ 465,057
% of Portfolio 9.30% 12.60%
Mixed Use [Member]    
Loans and Leases Receivable Disclosure [Line Items]    
Carrying value $ 320,984 $ 354,640
% of Portfolio 6.60% 9.60%
Healthcare [Member]    
Loans and Leases Receivable Disclosure [Line Items]    
Carrying value $ 255,588 $ 173,870
% of Portfolio 5.30% 4.70%
Retail Center [Member]    
Loans and Leases Receivable Disclosure [Line Items]    
Carrying value $ 202,031 $ 198,913
% of Portfolio 4.20% 5.40%
Other [Member]    
Loans and Leases Receivable Disclosure [Line Items]    
Carrying value $ 151,471 $ 154,141
% of Portfolio 3.10% 4.20%
Industrial [Member]    
Loans and Leases Receivable Disclosure [Line Items]    
Carrying value $ 32,000 $ 77,338
% of Portfolio 0.70% 2.10%
Manhattan, NY [Member]    
Loans and Leases Receivable Disclosure [Line Items]    
Carrying value $ 1,365,211 $ 1,173,833
% of Portfolio 28.30% 31.90%
Brooklyn, NY [Member]    
Loans and Leases Receivable Disclosure [Line Items]    
Carrying value $ 332,372 $ 357,611
% of Portfolio 6.90% 9.70%
Northeast [Member]    
Loans and Leases Receivable Disclosure [Line Items]    
Carrying value $ 37,410 $ 100,536
% of Portfolio 0.80% 2.70%
Midwest [Member]    
Loans and Leases Receivable Disclosure [Line Items]    
Carrying value $ 800,196 $ 683,380
% of Portfolio 16.60% 18.60%
Southeast [Member]    
Loans and Leases Receivable Disclosure [Line Items]    
Carrying value $ 608,925 $ 531,582
% of Portfolio 12.60% 14.40%
West [Member]    
Loans and Leases Receivable Disclosure [Line Items]    
Carrying value $ 522,818 $ 227,024
% of Portfolio 10.80% 6.20%
Mid Atlantic [Member]    
Loans and Leases Receivable Disclosure [Line Items]    
Carrying value $ 213,881 $ 191,976
% of Portfolio 4.40% 5.20%
Southwest [Member]    
Loans and Leases Receivable Disclosure [Line Items]    
Carrying value $ 115,683 $ 33,615
% of Portfolio 2.40% 0.90%
UNITED KINGDOM    
Loans and Leases Receivable Disclosure [Line Items]    
Carrying value $ 706,342 $ 303,488
% of Portfolio 14.60% 8.30%
Other International [Member]    
Loans and Leases Receivable Disclosure [Line Items]    
Carrying value $ 125,208 $ 76,713
% of Portfolio 2.60% 2.10%