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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, 2019 | Dec. 31, 2018
Loans and Leases Receivable Disclosure [Line Items] |  |
Carrying value | $ 5,443,744 | $ 4,927,593
% of Portfolio | 100.00% | 100.00%
Hotel |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Carrying value | $ 1,322,167 | $ 1,286,590
% of Portfolio | 24.30% | 26.10%
Residential-for-sale: construction |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Carrying value | $ 706,260 | $ 528,510
% of Portfolio | 12.90% | 10.70%
Residential-for-sale: inventory |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Carrying value | $ 395,375 | $ 577,053
% of Portfolio | 7.30% | 11.70%
Office |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Carrying value | $ 1,202,311 | $ 832,620
% of Portfolio | 22.20% | 16.90%
Urban Predevelopment |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Carrying value | $ 595,263 | $ 683,886
% of Portfolio | 10.80% | 13.90%
Multifamily |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Carrying value | $ 472,785 | $ 448,899
% of Portfolio | 8.70% | 9.10%
Industrial |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Carrying value | $ 227,451 | $ 32,000
% of Portfolio | 4.20% | 0.60%
Retail Center |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Carrying value | $ 158,128 | $ 156,067
% of Portfolio | 2.90% | 3.20%
Healthcare |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Carrying value | $ 142,933 | $ 156,814
% of Portfolio | 2.60% | 3.20%
Other |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Carrying value | $ 120,041 | $ 151,197
% of Portfolio | 2.20% | 3.10%
Mixed Use |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Carrying value | $ 101,030 | $ 73,957
% of Portfolio | 1.90% | 1.50%
Manhattan, NY |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Carrying value | $ 1,883,438 | $ 1,669,145
% of Portfolio | 34.60% | 33.90%
Brooklyn, NY |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Carrying value | $ 553,859 | $ 346,056
% of Portfolio | 10.20% | 7.00%
Northeast |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Carrying value | $ 18,738 | $ 23,479
% of Portfolio | 0.30% | 0.50%
West |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Carrying value | $ 696,804 | $ 614,160
% of Portfolio | 12.80% | 12.50%
Midwest |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Carrying value | $ 638,981 | $ 631,710
% of Portfolio | 11.80% | 12.80%
Southeast |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Carrying value | $ 501,878 | $ 559,043
% of Portfolio | 9.20% | 11.30%
Southwest |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Carrying value | $ 119,910 | $ 96,345
% of Portfolio | 2.20% | 2.00%
Mid Atlantic |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Carrying value | $ 108,056 | $ 211,775
% of Portfolio | 2.00% | 4.30%
United Kingdom |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Carrying value | $ 654,952 | $ 700,460
% of Portfolio | 12.00% | 14.20%
Other International |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Carrying value | $ 267,128 | $ 75,420
% of Portfolio | 4.90% | 1.50%

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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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