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DERIVATIVE INSTRUMENTS (Schedule of Derivative Instruments) (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Derivative Fair Values on Consolidated Balance Sheet [Line Items] |  |
Derivative Asset Fair Value | $ 5,283 | $ 5,125
Derivative Liability Fair Value | 14,381 | 14,386
Other assets | Not Designated as Hedging Instruments |  |
Derivative Fair Values on Consolidated Balance Sheet [Line Items] |  |
Derivative Asset Fair Value | 5,283 | 5,125
Other liabilities | Not Designated as Hedging Instruments |  |
Derivative Fair Values on Consolidated Balance Sheet [Line Items] |  |
Derivative Liability Fair Value | 14,381 | 14,386
Investment Portfolio | Foreign exchange forward contracts | Not Designated as Hedging Instruments |  |
Derivative Fair Values on Consolidated Balance Sheet [Line Items] |  |
Derivative Notional Amount | 120,762 | 137,422
Investment Portfolio | Foreign exchange forward contracts | Other assets | Not Designated as Hedging Instruments |  |
Derivative Fair Values on Consolidated Balance Sheet [Line Items] |  |
Derivative Asset Fair Value | 146 | 10
Investment Portfolio | Foreign exchange forward contracts | Other liabilities | Not Designated as Hedging Instruments |  |
Derivative Fair Values on Consolidated Balance Sheet [Line Items] |  |
Derivative Liability Fair Value | 161 | 619
Investment Portfolio | Interest rate swaps | Not Designated as Hedging Instruments |  |
Derivative Fair Values on Consolidated Balance Sheet [Line Items] |  |
Derivative Notional Amount | 166,000 | 191,000
Investment Portfolio | Interest rate swaps | Other assets | Not Designated as Hedging Instruments |  |
Derivative Fair Values on Consolidated Balance Sheet [Line Items] |  |
Derivative Asset Fair Value | 0 | 448
Investment Portfolio | Interest rate swaps | Other liabilities | Not Designated as Hedging Instruments |  |
Derivative Fair Values on Consolidated Balance Sheet [Line Items] |  |
Derivative Liability Fair Value | 1,379 | 1,556
Underwriting Portfolio | Foreign exchange forward contracts | Not Designated as Hedging Instruments |  |
Derivative Fair Values on Consolidated Balance Sheet [Line Items] |  |
Derivative Notional Amount | 649,919 | 698,959
Underwriting Portfolio | Foreign exchange forward contracts | Other assets | Not Designated as Hedging Instruments |  |
Derivative Fair Values on Consolidated Balance Sheet [Line Items] |  |
Derivative Asset Fair Value | 5,137 | 4,667
Underwriting Portfolio | Foreign exchange forward contracts | Other liabilities | Not Designated as Hedging Instruments |  |
Derivative Fair Values on Consolidated Balance Sheet [Line Items] |  |
Derivative Liability Fair Value | 1,899 | 701
Underwriting Portfolio | Weather-related contracts | Not Designated as Hedging Instruments |  |
Derivative Fair Values on Consolidated Balance Sheet [Line Items] |  |
Derivative Notional Amount | 0 | 0
Underwriting Portfolio | Weather-related contracts | Other assets | Not Designated as Hedging Instruments |  |
Derivative Fair Values on Consolidated Balance Sheet [Line Items] |  |
Derivative Asset Fair Value | 0 | 0
Underwriting Portfolio | Weather-related contracts | Other liabilities | Not Designated as Hedging Instruments |  |
Derivative Fair Values on Consolidated Balance Sheet [Line Items] |  |
Derivative Liability Fair Value | 0 | 0
Underwriting Portfolio | Other underwriting-related contracts | Not Designated as Hedging Instruments |  |
Derivative Fair Values on Consolidated Balance Sheet [Line Items] |  |
Derivative Notional Amount | 85,000 | 85,000
Underwriting Portfolio | Other underwriting-related contracts | Other assets | Not Designated as Hedging Instruments |  |
Derivative Fair Values on Consolidated Balance Sheet [Line Items] |  |
Derivative Asset Fair Value | 0 | 0
Underwriting Portfolio | Other underwriting-related contracts | Other liabilities | Not Designated as Hedging Instruments |  |
Derivative Fair Values on Consolidated Balance Sheet [Line Items] |  |
Derivative Liability Fair Value | $ 10,942 | $ 11,510

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