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Commercial Mortgage and Subordinate Loans, Net - Schedule of Mortgage Loans by Property Type and Geographic Distribution (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Loans and Leases Receivable Disclosure [Line Items]    
Carrying value $ 5,186,999 $ 4,927,593
% of Portfolio 100.00% 100.00%
Hotel [Member]    
Loans and Leases Receivable Disclosure [Line Items]    
Carrying value $ 1,330,842 $ 1,286,590
% of Portfolio 25.70% 26.10%
Residential-for-sale: construction [Member]    
Loans and Leases Receivable Disclosure [Line Items]    
Carrying value $ 631,501 $ 528,510
% of Portfolio 12.10% 10.70%
Residential-for-sale: inventory [Member]    
Loans and Leases Receivable Disclosure [Line Items]    
Carrying value $ 421,815 $ 577,053
% of Portfolio 8.10% 11.70%
Office [Member]    
Loans and Leases Receivable Disclosure [Line Items]    
Carrying value $ 956,989 $ 832,620
% of Portfolio 18.50% 16.90%
Urban Predevelopment [Member]    
Loans and Leases Receivable Disclosure [Line Items]    
Carrying value $ 610,888 $ 683,886
% of Portfolio 11.80% 13.90%
Multifamily [Member]    
Loans and Leases Receivable Disclosure [Line Items]    
Carrying value $ 521,087 $ 448,899
% of Portfolio 10.00% 9.10%
Industrial [Member]    
Loans and Leases Receivable Disclosure [Line Items]    
Carrying value $ 227,206 $ 32,000
% of Portfolio 4.40% 0.60%
Retail Center [Member]    
Loans and Leases Receivable Disclosure [Line Items]    
Carrying value $ 156,008 $ 156,067
% of Portfolio 3.00% 3.20%
Healthcare [Member]    
Loans and Leases Receivable Disclosure [Line Items]    
Carrying value $ 144,310 $ 156,814
% of Portfolio 2.80% 3.20%
Mixed Use [Member]    
Loans and Leases Receivable Disclosure [Line Items]    
Carrying value $ 114,284 $ 73,957
% of Portfolio 2.20% 1.50%
Other [Member]    
Loans and Leases Receivable Disclosure [Line Items]    
Carrying value $ 72,069 $ 151,197
% of Portfolio 1.40% 3.10%
Manhattan, NY [Member]    
Loans and Leases Receivable Disclosure [Line Items]    
Carrying value $ 1,825,136 $ 1,669,145
% of Portfolio 35.20% 33.90%
Brooklyn, NY [Member]    
Loans and Leases Receivable Disclosure [Line Items]    
Carrying value $ 547,139 $ 346,056
% of Portfolio 10.50% 7.00%
Northeast [Member]    
Loans and Leases Receivable Disclosure [Line Items]    
Carrying value $ 18,751 $ 23,479
% of Portfolio 0.40% 0.50%
West [Member]    
Loans and Leases Receivable Disclosure [Line Items]    
Carrying value $ 635,733 $ 614,160
% of Portfolio 12.30% 12.50%
Midwest [Member]    
Loans and Leases Receivable Disclosure [Line Items]    
Carrying value $ 617,599 $ 631,710
% of Portfolio 11.90% 12.80%
Southeast [Member]    
Loans and Leases Receivable Disclosure [Line Items]    
Carrying value $ 567,794 $ 559,043
% of Portfolio 10.90% 11.30%
Southwest [Member]    
Loans and Leases Receivable Disclosure [Line Items]    
Carrying value $ 120,127 $ 96,345
% of Portfolio 2.30% 2.00%
Mid Atlantic [Member]    
Loans and Leases Receivable Disclosure [Line Items]    
Carrying value $ 110,754 $ 211,775
% of Portfolio 2.10% 4.30%
UNITED KINGDOM    
Loans and Leases Receivable Disclosure [Line Items]    
Carrying value $ 668,507 $ 700,460
% of Portfolio 12.90% 14.20%
Other International [Member]    
Loans and Leases Receivable Disclosure [Line Items]    
Carrying value $ 75,459 $ 75,420
% of Portfolio 1.50% 1.50%