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Commercial Mortgage and Subordinate Loans, Net - Allocation of Carrying Value of Loan Portfolio Based on Internal Risk Ratings (Details) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2019 USD ($) loan | Dec. 31, 2018 USD ($) loan
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Number of Loans | loan | 71 | 69
Carrying value | $ | $ 5,443,744 | $ 4,927,593
% of Portfolio | 100.00% | 100.00%
Weighted-average risk rating | 3.0 | 3.1
1 |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Number of Loans | loan | 0 | 0
Carrying value | $ | $ 0 | $ 0
% of Portfolio | 0.00% | 0.00%
2 |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Number of Loans | loan | 3 | 3
Carrying value | $ | $ 253,817 | $ 138,040
% of Portfolio | 5.00% | 3.00%
3 |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Number of Loans | loan | 66 | 63
Carrying value | $ | $ 5,010,351 | $ 4,573,930
% of Portfolio | 92.00% | 93.00%
4 |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Number of Loans | loan | 0 | 0
Carrying value | $ | $ 0 | $ 0
% of Portfolio | 0.00% | 0.00%
5 |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Number of Loans | loan | 2 | 3
Carrying value | $ | $ 179,576 | $ 215,623
% of Portfolio | 3.00% | 4.00%

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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://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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