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INVESTMENTS - OTTI recognized in earnings (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Other Than Temporary Impairment Losses Investments Portion Recognized In Earnings Net [Line Items] |  |  |
Total OTTI recognized in net income | $ 6,984 | $ 9,733 | $ 14,493
Non-U.S. government |  |  |
Other Than Temporary Impairment Losses Investments Portion Recognized In Earnings Net [Line Items] |  |  |
Total OTTI recognized in net income | 90 | 4,697 | 8,187
Corporate debt |  |  |
Other Than Temporary Impairment Losses Investments Portion Recognized In Earnings Net [Line Items] |  |  |
Total OTTI recognized in net income | 6,894 | 4,995 | 6,306
Non-Agency CMBS |  |  |
Other Than Temporary Impairment Losses Investments Portion Recognized In Earnings Net [Line Items] |  |  |
Total OTTI recognized in net income | $ 0 | $ 41 | $ 0

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- Definition Amount of other-than-temporary impairment (OTTI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), recognized in earnings. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 8A -URI http://asc.fasb.org/extlink&oid=118954083&loc=SL6284422-111562 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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