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DERIVATIVE INSTRUMENTS - Unrealized and realized gains (losses) recognized in earnings for derivatives (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
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 | $ 8,961 | $ 5,278 | $ (22,972)
Investment Portfolio | Foreign exchange forward contracts | Net realized 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 | (6,935) | 10,929 | 11,265
Investment Portfolio | Interest rate swaps | Net realized 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 | (1,334) | 0 | (4,006)
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 | 25,383 | (8,179) | (25,412)
Underwriting Portfolio | Weather-related contracts | Other insurance related income (loss) |  |  |
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 | (9,629) | 4,910 | (3,005)
Underwriting Portfolio | Commodity contracts | Other insurance related income (loss) |  |  |
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 | 0 | (2,382) | (1,814)
Derivatives - Other underwriting-related derivatives | Commodity contracts | Other insurance related income (loss) |  |  |
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 | $ 1,476 | $ 0 | $ 0

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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/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 + Details
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