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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 | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 USD ($) loan | Dec. 31, 2017 USD ($) loan
Mortgage Loans on Real Estate [Line Items] |  |
Number of loans | loan | 63 | 59
Carrying value | $ | $ 4,067,494 | $ 3,679,758
% of Portfolio | 100.00% | 100.00%
1 [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Number of loans | loan | 0 | 0
Carrying value | $ | $ 0 | $ 0
% of Portfolio | 0.00% | 0.00%
2 [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Number of loans | loan | 6 | 5
Carrying value | $ | $ 395,212 | $ 399,326
% of Portfolio | 10.00% | 10.00%
3 [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Number of loans | loan | 54 | 51
Carrying value | $ | $ 3,431,086 | $ 3,034,358
% of Portfolio | 84.00% | 83.00%
4 [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Number of loans | loan | 1 | 1
Carrying value | $ | $ 168,677 | $ 168,208
% of Portfolio | 4.00% | 5.00%
5 [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Number of loans | loan | 2 | 2
Carrying value | $ | $ 72,519 | $ 77,866
% of Portfolio | 2.00% | 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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- Definition Indicates the number of mortgages under each classification. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 310 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-29.3) -URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 10 -Section S99 -Paragraph 6 -Subparagraph (SX 210.5-04.(c) Schedule IV) -URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674 + Details
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