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DERIVATIVE INSTRUMENTS (DETAILS) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Derivative Fair Values on Consolidated Balance Sheet [Line Items] |  |
Asset Derivative Fair Value | $ 6,467 | $ 7,264
Liability Derivative Fair Value | 18,629 | 18,329
Other Assets [Member] |  |
Derivative Fair Values on Consolidated Balance Sheet [Line Items] |  |
Asset Derivative Fair Value | 6,467 | 7,264
Other Liabilities [Member] |  |
Derivative Fair Values on Consolidated Balance Sheet [Line Items] |  |
Liability Derivative Fair Value | 18,629 | 18,329
Investment Portfolio [Member] | Foreign Exchange Forward Contracts [Member] | Not Designated as Hedging Instruments [Member] |  |
Derivative Fair Values on Consolidated Balance Sheet [Line Items] |  |
Derivative Notional Amount | 198,406 | 161,678
Investment Portfolio [Member] | Foreign Exchange Forward Contracts [Member] | Other Assets [Member] | Not Designated as Hedging Instruments [Member] |  |
Derivative Fair Values on Consolidated Balance Sheet [Line Items] |  |
Asset Derivative Fair Value | 490 | 3,925
Investment Portfolio [Member] | Foreign Exchange Forward Contracts [Member] | Other Liabilities [Member] | Not Designated as Hedging Instruments [Member] |  |
Derivative Fair Values on Consolidated Balance Sheet [Line Items] |  |
Liability Derivative Fair Value | 837 | 12
Investment Portfolio [Member] | Interest Rate Swap [Member] | Not Designated as Hedging Instruments [Member] |  |
Derivative Fair Values on Consolidated Balance Sheet [Line Items] |  |
Derivative Notional Amount | 0 | 140,000
Investment Portfolio [Member] | Interest Rate Swap [Member] | Other Assets [Member] | Not Designated as Hedging Instruments [Member] |  |
Derivative Fair Values on Consolidated Balance Sheet [Line Items] |  |
Asset Derivative Fair Value | 0 | 0
Investment Portfolio [Member] | Interest Rate Swap [Member] | Other Liabilities [Member] | Not Designated as Hedging Instruments [Member] |  |
Derivative Fair Values on Consolidated Balance Sheet [Line Items] |  |
Liability Derivative Fair Value | 0 | 248
Underwriting Portfolio [Member] | Foreign Exchange Forward Contracts [Member] | Not Designated as Hedging Instruments [Member] |  |
Derivative Fair Values on Consolidated Balance Sheet [Line Items] |  |
Derivative Notional Amount | 692,023 | 577,836
Underwriting Portfolio [Member] | Foreign Exchange Forward Contracts [Member] | Other Assets [Member] | Not Designated as Hedging Instruments [Member] |  |
Derivative Fair Values on Consolidated Balance Sheet [Line Items] |  |
Asset Derivative Fair Value | 1,582 | 3,228
Underwriting Portfolio [Member] | Foreign Exchange Forward Contracts [Member] | Other Liabilities [Member] | Not Designated as Hedging Instruments [Member] |  |
Derivative Fair Values on Consolidated Balance Sheet [Line Items] |  |
Liability Derivative Fair Value | 6,855 | 2,781
Underwriting Portfolio [Member] | Weather-related contracts [Member] | Not Designated as Hedging Instruments [Member] |  |
Derivative Fair Values on Consolidated Balance Sheet [Line Items] |  |
Derivative Notional Amount | 51,395 | 58,124
Underwriting Portfolio [Member] | Weather-related contracts [Member] | Other Assets [Member] | Not Designated as Hedging Instruments [Member] |  |
Derivative Fair Values on Consolidated Balance Sheet [Line Items] |  |
Asset Derivative Fair Value | 4,395 | 111
Underwriting Portfolio [Member] | Weather-related contracts [Member] | Other Liabilities [Member] | Not Designated as Hedging Instruments [Member] |  |
Derivative Fair Values on Consolidated Balance Sheet [Line Items] |  |
Liability Derivative Fair Value | 10,937 | 15,288
Underwriting Portfolio [Member] | Commodity Contract [Member] | Not Designated as Hedging Instruments [Member] |  |
Derivative Fair Values on Consolidated Balance Sheet [Line Items] |  |
Derivative Notional Amount | 0 | 0
Underwriting Portfolio [Member] | Commodity Contract [Member] | Other Assets [Member] | Not Designated as Hedging Instruments [Member] |  |
Derivative Fair Values on Consolidated Balance Sheet [Line Items] |  |
Asset Derivative Fair Value | 0 | 0
Underwriting Portfolio [Member] | Commodity Contract [Member] | Other Liabilities [Member] | Not Designated as Hedging Instruments [Member] |  |
Derivative Fair Values on Consolidated Balance Sheet [Line Items] |  |
Liability Derivative Fair Value | $ 0 | $ 0

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