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Commercial Mortgage and Subordinate Loans, Net - Schedule of Mortgage Loans by Property Type and Geographic Distribution (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 | Dec. 31, 2017
Loans and Leases Receivable Disclosure [Line Items] |  |
Carrying value | $ 4,828,046 | $ 3,679,758
% of Portfolio | 100.00% | 100.00%
Hotel [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Carrying value | $ 1,229,460 | $ 645,056
% of Portfolio | 25.50% | 17.60%
Residential-for Sale [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Carrying value |  | $ 442,200
Residential-for-sale: inventory [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Carrying value | $ 602,826 | $ 92,438
% of Portfolio | 12.50% | 2.50%
Residential-for-sale: construction [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Carrying value | $ 385,303 | $ 349,739
% of Portfolio | 8.00% | 9.50%
Urban Predevelopment [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Carrying value | $ 677,440 | $ 654,736
% of Portfolio | 14.00% | 17.80%
Office [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Carrying value | $ 520,926 | $ 513,830
% of Portfolio | 10.80% | 14.00%
Multifamily [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Carrying value | $ 450,017 | $ 465,057
% of Portfolio | 9.30% | 12.60%
Mixed Use [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Carrying value | $ 320,984 | $ 354,640
% of Portfolio | 6.60% | 9.60%
Healthcare [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Carrying value | $ 255,588 | $ 173,870
% of Portfolio | 5.30% | 4.70%
Retail Center [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Carrying value | $ 202,031 | $ 198,913
% of Portfolio | 4.20% | 5.40%
Other [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Carrying value | $ 151,471 | $ 154,141
% of Portfolio | 3.10% | 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 | $ 1,365,211 | $ 1,173,833
% of Portfolio | 28.30% | 31.90%
Brooklyn, NY [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Carrying value | $ 332,372 | $ 357,611
% of Portfolio | 6.90% | 9.70%
Northeast [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Carrying value | $ 37,410 | $ 100,536
% of Portfolio | 0.80% | 2.70%
Midwest [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Carrying value | $ 800,196 | $ 683,380
% of Portfolio | 16.60% | 18.60%
Southeast [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Carrying value | $ 608,925 | $ 531,582
% of Portfolio | 12.60% | 14.40%
West [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Carrying value | $ 522,818 | $ 227,024
% of Portfolio | 10.80% | 6.20%
Mid Atlantic [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Carrying value | $ 213,881 | $ 191,976
% of Portfolio | 4.40% | 5.20%
Southwest [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Carrying value | $ 115,683 | $ 33,615
% of Portfolio | 2.40% | 0.90%
UNITED KINGDOM |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Carrying value | $ 706,342 | $ 303,488
% of Portfolio | 14.60% | 8.30%
Other International [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Carrying value | $ 125,208 | $ 76,713
% of Portfolio | 2.60% | 2.10%

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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=6879938&loc=d3e572229-122910 + Details
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