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DERIVATIVE INSTRUMENTS (DETAILS 3) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
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 | $ 5,278 | $ (22,972) | $ (17,011)
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 | 10,929 | 11,265 | 10,333
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 | 0 | (4,006) | (19,936)
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 | (8,179) | (25,412) | (10,363)
Underwriting Portfolio [Member] | Weather Related Derivative [Member] | Other Insurance Related Income (Loss) [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 | 4,910 | (3,005) | (5,373)
Underwriting Portfolio [Member] | Commodity Contract [Member] | Other Insurance Related Income (Loss) [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 | $ (2,382) | $ (1,814) | $ 8,328

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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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