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DERIVATIVE INSTRUMENTS (DETAILS) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2014 | Dec. 31, 2013
--- | --- | ---
Derivative Fair Values on Consolidated Balance Sheet [Line Items] |  |
Asset Derivative Fair Value | $ 9,191 | $ 7,808
Liability Derivative Fair Value | 3,033 | 1,967
Other Assets [Member] |  |
Derivative Fair Values on Consolidated Balance Sheet [Line Items] |  |
Asset Derivative Fair Value | 9,191 | 7,808
Other Liabilities [Member] |  |
Derivative Fair Values on Consolidated Balance Sheet [Line Items] |  |
Liability Derivative Fair Value | 3,033 | 1,967
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 | 132,230 | 254,023
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 | 12 | 1,214
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 | 2,011 | 1,032
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 | 281,250 | 281,250
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 | 873
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 | 272 | 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 | 605,076 | 390,663
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 | 5,608 | 4,737
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 | 0 | 120
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 | 3,000 | 24,451
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] |  |
Asset Derivative Fair Value | 0 | 984
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] |  |
Liability Derivative Fair Value | 750 | 815
Underwriting Portfolio [Member] | Commodity Contract [Member] | Not Designated as Hedging Instruments [Member] |  |
Derivative Fair Values on Consolidated Balance Sheet [Line Items] |  |
Derivative Notional Amount | 100,850 | 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 | 3,571 | 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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