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DERIVATIVE INSTRUMENTS (DETAILS) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Derivative Fair Values on Consolidated Balance Sheet [Line Items] |  |
Derivative Asset Fair Value | $ 16,897 | $ 6,467
Derivative Liability Fair Value | 15,576 | 18,629
Other Assets [Member] |  |
Derivative Fair Values on Consolidated Balance Sheet [Line Items] |  |
Derivative Asset Fair Value | 16,897 | 6,467
Other Liabilities [Member] |  |
Derivative Fair Values on Consolidated Balance Sheet [Line Items] |  |
Derivative Liability Fair Value | 15,576 | 18,629
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 | 195,979 | 198,406
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] |  |
Derivative Asset Fair Value | 12,331 | 490
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] |  |
Derivative Liability Fair Value | 87 | 837
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 | 0
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] |  |
Derivative Asset 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] |  |
Derivative Liability Fair Value | 0 | 0
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 | 492,899 | 692,023
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] |  |
Derivative Asset Fair Value | 2,034 | 1,582
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] |  |
Derivative Liability Fair Value | 8,989 | 6,855
Underwriting Portfolio [Member] | Weather Related Derivative [Member] | Not Designated as Hedging Instruments [Member] |  |
Derivative Fair Values on Consolidated Balance Sheet [Line Items] |  |
Derivative Notional Amount | 67,957 | 51,395
Underwriting Portfolio [Member] | Weather Related Derivative [Member] | Other Assets [Member] | Not Designated as Hedging Instruments [Member] |  |
Derivative Fair Values on Consolidated Balance Sheet [Line Items] |  |
Derivative Asset Fair Value | 2,532 | 4,395
Underwriting Portfolio [Member] | Weather Related Derivative [Member] | Other Liabilities [Member] | Not Designated as Hedging Instruments [Member] |  |
Derivative Fair Values on Consolidated Balance Sheet [Line Items] |  |
Derivative Liability Fair Value | 6,500 | 10,937
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] |  |
Derivative Asset 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] |  |
Derivative Liability Fair Value | $ 0 | $ 0

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