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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, 2018 USD ($) loan | Dec. 31, 2017 USD ($) loan
Financing Receivable, Recorded Investment [Line Items] |  |
Number of loans | loan | 70 | 59
Carrying value | $ | $ 4,866,735 | $ 3,679,758
% of Portfolio | 100.00% | 100.00%
1 [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Number of loans | loan | 0 | 0
Carrying value | $ | $ 0 | $ 0
% of Portfolio | 0.00% | 0.00%
2 [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Number of loans | loan | 4 | 5
Carrying value | $ | $ 263,216 | $ 399,326
% of Portfolio | 5.00% | 10.00%
3 [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Number of loans | loan | 63 | 51
Carrying value | $ | $ 4,367,766 | $ 3,034,358
% of Portfolio | 90.00% | 83.00%
4 [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Number of loans | loan | 1 | 1
Carrying value | $ | $ 170,685 | $ 168,208
% of Portfolio | 4.00% | 5.00%
5 [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Number of loans | loan | 2 | 2
Carrying value | $ | $ 65,068 | $ 77,866
% of Portfolio | 1.00% | 2.00%

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- Definition Number of mortgage loans within investment in mortgage loan on real estate by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 12 -Footnote 3 -Subsection 29 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 310 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-29(Footnote 3)) -URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014 + 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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