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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, 2018 | Dec. 31, 2017
Mortgage Loans on Real Estate [Line Items] |  |
Carrying value | $ 4,067,494 | $ 3,679,758
% of Portfolio | 100.00% | 100.00%
Urban Retail Predevelopment [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Carrying value | $ 710,992 | $ 654,736
% of Portfolio | 17.50% | 17.80%
Residential-for Sale [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Carrying value | $ 704,020 | $ 442,177
% of Portfolio | 17.30% | 12.00%
Hotel [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Carrying value | $ 654,631 | $ 645,056
% of Portfolio | 16.10% | 17.60%
Office [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Carrying value | $ 584,990 | $ 513,830
% of Portfolio | 14.40% | 14.00%
Residential Rental [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Carrying value | $ 467,605 | $ 465,057
% of Portfolio | 11.50% | 12.60%
Mixed Use [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Carrying value | $ 356,079 | $ 354,640
% of Portfolio | 8.70% | 9.60%
Retail Center [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Carrying value | $ 199,463 | $ 198,913
% of Portfolio | 4.90% | 5.40%
Healthcare [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Carrying value | $ 158,292 | $ 173,870
% of Portfolio | 3.90% | 4.70%
Other Property [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Carrying value | $ 154,084 | $ 154,141
% of Portfolio | 3.80% | 4.20%
Industrial [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Carrying value | $ 77,338 | $ 77,338
% of Portfolio | 1.90% | 2.10%
Manhattan, NY [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Carrying value | $ 1,209,678 | $ 1,173,833
% of Portfolio | 29.70% | 31.90%
Brooklyn, NY [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Carrying value | $ 358,425 | $ 357,611
% of Portfolio | 8.80% | 9.70%
Northeast [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Carrying value | $ 107,671 | $ 100,536
% of Portfolio | 2.70% | 2.70%
Midwest [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Carrying value | $ 737,780 | $ 683,380
% of Portfolio | 18.10% | 18.60%
Southeast [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Carrying value | $ 447,450 | $ 531,582
% of Portfolio | 11.00% | 14.40%
West [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Carrying value | $ 270,170 | $ 227,024
% of Portfolio | 6.60% | 6.20%
Mid Atlantic [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Carrying value | $ 182,320 | $ 191,976
% of Portfolio | 4.50% | 5.20%
Southwest [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Carrying value | $ 33,384 | $ 33,615
% of Portfolio | 0.80% | 0.90%
UNITED KINGDOM |  |
Mortgage Loans on Real Estate [Line Items] |  |
Carrying value | $ 645,338 | $ 303,488
% of Portfolio | 15.90% | 8.30%
Other International [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Carrying value | $ 75,278 | $ 76,713
% of Portfolio | 1.90% | 2.10%

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- Definition The balance represents the amount of loans that are secured by real estate mortgages, offset by the reserve to cover probable credit losses on the loan portfolio. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1(c)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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