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RETIREMENT BENEFIT PLANS (Schedule of Net Periodic Benefit Costs) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Retirement Benefits [Abstract]    
Service cost $ 3,815 $ 2,704
Interest cost 517 351
Expected return on plan assets (1,047) (944)
Amortization of prior service cost (credit) (259) 0
Recognized actuarial losses 65 8
Settlements 602 0
Net period benefit cost $ 3,693 $ 2,119