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Commercial Mortgage and Subordinate Loans, Net - Schedule of Mortgage Loans by Property Type and Geographic Distribution (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Mortgage Loans on Real Estate [Line Items] |  |
Carrying value | $ 3,679,758 | $ 2,693,092
% of Portfolio | 100.00% | 100.00%
Urban Retail Predevelopment [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Carrying value | $ 654,736 | $ 491,187
% of Portfolio | 17.80% | 18.20%
Hotel [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Carrying value | $ 645,056 | $ 408,428
% of Portfolio | 17.50% | 15.20%
Office [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Carrying value | $ 513,830 | $ 255,031
% of Portfolio | 14.00% | 9.50%
Residential Rental [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Carrying value | $ 465,057 | $ 309,243
% of Portfolio | 12.60% | 11.50%
Residential-for Sale [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Carrying value | $ 442,179 | $ 469,997
% of Portfolio | 12.00% | 17.50%
Mixed Use [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Carrying value | $ 354,640 | $ 134,797
% of Portfolio | 9.60% | 5.00%
Retail Center [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Carrying value | $ 198,913 | $ 209,401
% of Portfolio | 5.40% | 7.80%
Healthcare [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Carrying value | $ 173,870 | $ 170,549
% of Portfolio | 4.70% | 6.30%
Other Property [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Carrying value | $ 154,141 | $ 87,650
% of Portfolio | 4.20% | 3.30%
Industrial [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Carrying value | $ 77,338 | $ 156,809
% of Portfolio | 2.10% | 5.80%
Manhattan, NY [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Carrying value | $ 1,173,833 | $ 870,914
% of Portfolio | 31.90% | 32.30%
Brooklyn, NY [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Carrying value | $ 357,611 | $ 163,389
% of Portfolio | 9.70% | 6.10%
Northeast [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Carrying value | $ 100,536 | $ 137,770
% of Portfolio | 2.70% | 5.10%
Midwest [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Carrying value | $ 683,380 | $ 405,992
% of Portfolio | 18.60% | 15.10%
Southeast [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Carrying value | $ 531,582 | $ 332,276
% of Portfolio | 14.40% | 12.30%
United Kingdom [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Carrying value | $ 303,488 | $ 244,756
% of Portfolio | 8.20% | 9.10%
West [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Carrying value | $ 227,024 | $ 219,664
% of Portfolio | 6.20% | 8.20%
Mid Atlantic [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Carrying value | $ 191,976 | $ 263,717
% of Portfolio | 5.20% | 9.80%
Other International [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Carrying value | $ 76,713 | $ 0
% of Portfolio | 2.10% | 0.00%
Southwest [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Carrying value | $ 33,615 | $ 54,614
% of Portfolio | 0.90% | 2.00%

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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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