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DERIVATIVE INSTRUMENTS (Other Underwriting-related Risks) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Unrealized and Realized Gains (Losses) Recognized in Earnings for Derivatives Not Designated As Hedges [Line Items] |  |  |  |
Unrealized and realized gains (losses) recognized in earnings for derivatives not designated as hedges | $ 869 | $ (2,028) | $ (11,402) | $ 8,566
Investment Portfolio | Foreign exchange forward contracts | Net investment gains (losses) |  |  |  |
Unrealized and Realized Gains (Losses) Recognized in Earnings for Derivatives Not Designated As Hedges [Line Items] |  |  |  |
Unrealized and realized gains (losses) recognized in earnings for derivatives not designated as hedges | 620 | 2,515 | 1,372 | 1,323
Investment Portfolio | Interest rate swaps | Net investment gains (losses) |  |  |  |
Unrealized and Realized Gains (Losses) Recognized in Earnings for Derivatives Not Designated As Hedges [Line Items] |  |  |  |
Unrealized and realized gains (losses) recognized in earnings for derivatives not designated as hedges | (824) | 2,619 | (3,677) | 5,833
Underwriting Portfolio | Foreign exchange forward contracts | Foreign exchange gains (losses) |  |  |  |
Unrealized and Realized Gains (Losses) Recognized in Earnings for Derivatives Not Designated As Hedges [Line Items] |  |  |  |
Unrealized and realized gains (losses) recognized in earnings for derivatives not designated as hedges | 802 | (7,809) | (9,715) | (138)
Underwriting Portfolio | Other underwriting-related contracts | Other insurance related income (losses) |  |  |  |
Unrealized and Realized Gains (Losses) Recognized in Earnings for Derivatives Not Designated As Hedges [Line Items] |  |  |  |
Unrealized and realized gains (losses) recognized in earnings for derivatives not designated as hedges | $ 271 | $ 647 | $ 618 | $ 1,548

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- Definition Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4CC -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL109998890-113959 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624171-113959 + Details
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