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DERIVATIVE INSTRUMENTS (Schedule of Derivative Instruments) (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Derivative Fair Values on Consolidated Balance Sheet [Line Items]
Derivative asset fair value	$ 3,290	$ 18,875
Derivative liability fair value	20,089	11,486
Not Designated as Hedging Instruments | Other assets
Derivative Fair Values on Consolidated Balance Sheet [Line Items]
Derivative asset fair value	3,290	18,875
Not Designated as Hedging Instruments | Other liabilities
Derivative Fair Values on Consolidated Balance Sheet [Line Items]
Derivative liability fair value	20,089	11,486
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	298,139	105,781
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	1,745	2
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	328	2,364
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	1,154,468	1,197,012
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	1,545	18,873
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	12,042	0
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	75,000	75,000
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	$ 7,719	$ 9,122

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