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DERIVATIVE INSTRUMENTS (Schedule of Derivative Instruments) (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Derivative Fair Values on Consolidated Balance Sheet [Line Items] |  |
Derivative asset fair value | $ 1,343 | $ 8,237
Derivative liability fair value | 17,601 | 14,522
Not Designated as Hedging Instruments | Other assets |  |
Derivative Fair Values on Consolidated Balance Sheet [Line Items] |  |
Derivative asset fair value | 1,343 | 8,237
Not Designated as Hedging Instruments | Other liabilities |  |
Derivative Fair Values on Consolidated Balance Sheet [Line Items] |  |
Derivative liability fair value | 17,601 | 14,522
Not Designated as Hedging Instruments | Relating to investment portfolio | Foreign exchange forward contracts |  |
Derivative Fair Values on Consolidated Balance Sheet [Line Items] |  |
Derivative notional amount | 152,963 | 79,336
Not Designated as Hedging Instruments | Relating to investment portfolio | Foreign exchange forward contracts | Other assets |  |
Derivative Fair Values on Consolidated Balance Sheet [Line Items] |  |
Derivative asset fair value | 517 | 262
Not Designated as Hedging Instruments | Relating to investment portfolio | Foreign exchange forward contracts | Other liabilities |  |
Derivative Fair Values on Consolidated Balance Sheet [Line Items] |  |
Derivative liability fair value | 425 | 531
Not Designated as Hedging Instruments | Relating to investment portfolio | Interest rate swaps |  |
Derivative Fair Values on Consolidated Balance Sheet [Line Items] |  |
Derivative notional amount | 0 | 150,000
Not Designated as Hedging Instruments | Relating to investment portfolio | Interest rate swaps | Other assets |  |
Derivative Fair Values on Consolidated Balance Sheet [Line Items] |  |
Derivative asset fair value | 0 | 0
Not Designated as Hedging Instruments | Relating to investment portfolio | Interest rate swaps | Other liabilities |  |
Derivative Fair Values on Consolidated Balance Sheet [Line Items] |  |
Derivative liability fair value | 0 | 1,116
Not Designated as Hedging Instruments | Relating to underwriting portfolio | Foreign exchange forward contracts |  |
Derivative Fair Values on Consolidated Balance Sheet [Line Items] |  |
Derivative notional amount | 531,864 | 737,419
Not Designated as Hedging Instruments | Relating to underwriting portfolio | Foreign exchange forward contracts | Other assets |  |
Derivative Fair Values on Consolidated Balance Sheet [Line Items] |  |
Derivative asset fair value | 826 | 7,975
Not Designated as Hedging Instruments | Relating to underwriting portfolio | Foreign exchange forward contracts | Other liabilities |  |
Derivative Fair Values on Consolidated Balance Sheet [Line Items] |  |
Derivative liability fair value | 7,040 | 2,576
Not Designated as Hedging Instruments | Relating to underwriting portfolio | Other underwriting-related contracts |  |
Derivative Fair Values on Consolidated Balance Sheet [Line Items] |  |
Derivative notional amount | 85,000 | 85,000
Not Designated as Hedging Instruments | Relating to underwriting portfolio | Other underwriting-related contracts | Other assets |  |
Derivative Fair Values on Consolidated Balance Sheet [Line Items] |  |
Derivative asset fair value | 0 | 0
Not Designated as Hedging Instruments | Relating to underwriting portfolio | Other underwriting-related contracts | Other liabilities |  |
Derivative Fair Values on Consolidated Balance Sheet [Line Items] |  |
Derivative liability fair value | $ 10,136 | $ 10,299

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