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DERIVATIVE INSTRUMENTS (Details 3) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2017 | Mar. 31, 2016
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 | $ (12,623) | $ 450
Investment Portfolio [Member] | Foreign Exchange Forward Contracts [Member] | Net Realized Investment Gains (Losses) [Member] |  |
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 | (2,372) | (2,520)
Investment Portfolio [Member] | Interest Rate Swap [Member] | Net Realized Investment Gains (Losses) [Member] |  |
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 | 439 | 0
Underwriting Portfolio [Member] | Foreign Exchange Forward Contracts [Member] | Foreign Exchange Gains (Losses) [Member] |  |
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 | (2,758) | 3,202
Underwriting Portfolio [Member] | Weather Related Derivative [Member] | Other Insurance Related Income [Member] |  |
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 | (7,932) | (475)
Underwriting Portfolio [Member] | Commodity Contract [Member] | Other Insurance Related Income [Member] |  |
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 | $ 243

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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=64837297&loc=SL5624171-113959 + Details
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