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INVESTMENTS - Securities narrative (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Schedule Of Available For Sale Securities [Line Items] |  |
Fair value | $ 12,468,205 | $ 11,435,347
Total Unrealized Losses | 32,000 | 215,000
Fair value | 474,207 | 381,633
Non-U.S. government |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Fair value | 576,592 | 493,016
Total Unrealized Losses | 2,448 | 16,120
Non-U.S. government | Eurozone |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Fair value | 37,000 | 29,000
CMBS |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Fair value | 1,365,052 | 1,092,530
Total Unrealized Losses | $ 4,942 | $ 13,795
CMBS | Weighted Average |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Subordination percentage input for determining credit losses | 29.00% | 31.00%
Non-Agency RMBS |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Fair value | $ 84,922 | $ 40,687
Total Unrealized Losses | 852 | 1,282
Non-Agency RMBS | Prime |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Fair value | 54,000 | 31,000
Non-Agency RMBS | Alt A |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Fair value | $ 11,000 | $ 5,000

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- Definition This item represents the current level of subordination of the entity's receipt of consideration should the assets underlying the security be liquidated when the level of subordination was considered as one of the potential factors in reaching a conclusion that the available-for-sale investments are other than temporarily impaired and the amount of such impairment determined to be related to credit loss recognized in earnings. + References No definition available. + Details
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- Definition Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=99377092&loc=SL75136599-209740 + Details
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