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FINANCIAL RISK MANAGEMENT (Changes in Fair Value) (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
USD ($)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]  
Financial assets, at fair value beginning balance $ 496,832
Financial assets, at fair value ending balance 1,432,536
Level 3  
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]  
Financial assets, at fair value beginning balance 2,629
Financial assets, at fair value ending balance 27,821
Guarantee fund companies | Level 3  
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]  
Financial assets, at fair value beginning balance 2,629
Additions 0
Changes in fair value 1,189
Net foreign exchange gain (555)
Financial assets, at fair value ending balance 3,263
Non - U.S. government securities | Level 3  
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]  
Financial assets, at fair value beginning balance 0
Additions 7,863
Changes in fair value 0
Net foreign exchange gain 0
Financial assets, at fair value ending balance 7,863
Corporate securities | Level 3  
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]  
Financial assets, at fair value beginning balance 0
Additions 16,695
Changes in fair value 0
Net foreign exchange gain 0
Financial assets, at fair value ending balance $ 16,695