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Commercial Mortgage, Subordinate Loans and Other Lending Assets, Net - Schedule of Mortgage Loans by Property Type and Geographic Distribution (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Loans and Leases Receivable Disclosure [Line Items] |  |
Carrying value | $ 6,375,093 | $ 4,927,593
% of Portfolio | 100.00% | 100.00%
Manhattan, NY |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Carrying value | $ 1,793,570 | $ 1,669,145
% of Portfolio | 28.10% | 33.90%
Brooklyn, NY |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Carrying value | $ 373,917 | $ 346,056
% of Portfolio | 5.90% | 7.00%
Northeast |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Carrying value | $ 110,771 | $ 23,479
% of Portfolio | 1.70% | 0.50%
West |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Carrying value | $ 728,182 | $ 614,160
% of Portfolio | 11.40% | 12.50%
Midwest |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Carrying value | $ 614,337 | $ 631,710
% of Portfolio | 9.60% | 12.80%
Southeast |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Carrying value | $ 564,166 | $ 559,043
% of Portfolio | 8.90% | 11.30%
United Kingdom |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Carrying value | $ 1,274,390 | $ 700,460
% of Portfolio | 20.00% | 14.20%
Other |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Carrying value | $ 915,760 | $ 383,540
% of Portfolio | 14.40% | 7.80%
Hotel |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Carrying value | $ 1,660,162 | $ 1,286,590
% of Portfolio | 26.00% | 26.10%
Office |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Carrying value | $ 1,401,400 | $ 832,620
% of Portfolio | 22.00% | 16.90%
Residential-for-sale: construction |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Carrying value | $ 692,816 | $ 528,510
% of Portfolio | 10.90% | 10.70%
Residential-for-sale: inventory |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Carrying value | $ 321,673 | $ 577,053
% of Portfolio | 5.10% | 11.70%
Urban Retail |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Carrying value | $ 643,706 | $ 0
% of Portfolio | 10.10% | 0.00%
Urban Predevelopment |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Carrying value | $ 409,864 | $ 683,886
% of Portfolio | 6.40% | 13.90%
Healthcare |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Carrying value | $ 371,423 | $ 156,814
% of Portfolio | 5.80% | 3.20%
Other |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Carrying value | $ 874,049 | $ 862,120
% of Portfolio | 13.70% | 17.50%

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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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://fasb.org/us-gaap/role/ref/legacyRef -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=119400593&loc=d3e572229-122910 + Details
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