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Commercial Mortgage and Subordinate Loans, Net - Schedule of Mortgage Loans by Property Type and Geographic Distribution (Details) - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2018
Dec. 31, 2017
Loans and Leases Receivable Disclosure [Line Items]    
Carrying value $ 4,866,735 $ 3,679,758
% of Portfolio 100.00% 100.00%
Hotel [Member]    
Loans and Leases Receivable Disclosure [Line Items]    
Carrying value $ 1,137,737 $ 645,056
% of Portfolio 23.40% 17.60%
Residential-for Sale [Member]    
Loans and Leases Receivable Disclosure [Line Items]    
Carrying value   $ 442,000
Residential-for-sale: inventory [Member]    
Loans and Leases Receivable Disclosure [Line Items]    
Carrying value $ 616,608 $ 92,438
% of Portfolio 12.70% 2.50%
Residential-for-sale: construction [Member]    
Loans and Leases Receivable Disclosure [Line Items]    
Carrying value $ 333,884 $ 349,739
% of Portfolio 6.80% 9.50%
Urban Retail Predevelopment [Member]    
Loans and Leases Receivable Disclosure [Line Items]    
Carrying value $ 724,366 $ 654,736
% of Portfolio 14.90% 17.80%
Office [Member]    
Loans and Leases Receivable Disclosure [Line Items]    
Carrying value $ 603,947 $ 513,830
% of Portfolio 12.40% 14.00%
Multifamily [Member]    
Loans and Leases Receivable Disclosure [Line Items]    
Carrying value $ 449,414 $ 465,057
% of Portfolio 9.20% 12.60%
Mixed Use [Member]    
Loans and Leases Receivable Disclosure [Line Items]    
Carrying value $ 356,703 $ 354,640
% of Portfolio 7.30% 9.60%
Healthcare [Member]    
Loans and Leases Receivable Disclosure [Line Items]    
Carrying value $ 256,372 $ 173,870
% of Portfolio 5.30% 4.70%
Retail Center [Member]    
Loans and Leases Receivable Disclosure [Line Items]    
Carrying value $ 201,551 $ 198,913
% of Portfolio 4.10% 5.40%
Other [Member]    
Loans and Leases Receivable Disclosure [Line Items]    
Carrying value $ 154,153 $ 154,141
% of Portfolio 3.20% 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 $ 1,445,389 $ 1,173,833
% of Portfolio 29.70% 31.90%
Brooklyn, NY [Member]    
Loans and Leases Receivable Disclosure [Line Items]    
Carrying value $ 388,814 $ 357,611
% of Portfolio 8.00% 9.70%
Northeast [Member]    
Loans and Leases Receivable Disclosure [Line Items]    
Carrying value $ 37,956 $ 100,536
% of Portfolio 0.80% 2.70%
Midwest [Member]    
Loans and Leases Receivable Disclosure [Line Items]    
Carrying value $ 718,600 $ 683,380
% of Portfolio 14.80% 18.60%
UNITED KINGDOM    
Loans and Leases Receivable Disclosure [Line Items]    
Carrying value $ 711,324 $ 303,488
% of Portfolio 14.60% 8.30%
Southeast [Member]    
Loans and Leases Receivable Disclosure [Line Items]    
Carrying value $ 608,884 $ 531,582
% of Portfolio 12.50% 14.40%
West [Member]    
Loans and Leases Receivable Disclosure [Line Items]    
Carrying value $ 500,102 $ 227,024
% of Portfolio 10.20% 6.20%
Mid Atlantic [Member]    
Loans and Leases Receivable Disclosure [Line Items]    
Carrying value $ 214,521 $ 191,976
% of Portfolio 4.40% 5.20%
Other International [Member]    
Loans and Leases Receivable Disclosure [Line Items]    
Carrying value $ 125,506 $ 76,713
% of Portfolio 2.60% 2.10%
Southwest [Member]    
Loans and Leases Receivable Disclosure [Line Items]    
Carrying value $ 115,639 $ 33,615
% of Portfolio 2.40% 0.90%