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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 | 12 Months Ended
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Dec. 31, 2017 USD ($) loan | Dec. 31, 2016 USD ($) loan
Mortgage Loans on Real Estate [Line Items] |  |
Number of loans | loan | 59 | 45
Carrying value | $ | $ 3,679,758 | $ 2,693,092
% of Portfolio | 100.00% | 100.00%
1 [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Number of loans | loan | 0 |
Carrying value | $ | $ 0 |
% of Portfolio | 0.00% |
2 [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Number of loans | loan | 5 |
Carrying value | $ | $ 399,326 |
% of Portfolio | 10.00% |
3 [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Number of loans | loan | 51 |
Carrying value | $ | $ 3,034,358 |
% of Portfolio | 83.00% |
4 [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Number of loans | loan | 1 |
Carrying value | $ | $ 168,208 |
% of Portfolio | 5.00% |
5 [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Number of loans | loan | 2 |
Carrying value | $ | $ 77,866 |
% of Portfolio | 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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