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RETIREMENT BENEFIT PLANS (Schedule of Net Periodic Benefit Costs) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Retirement Benefits [Abstract]
Service cost	$ 4,029	$ 3,815
Interest cost	219	517
Expected return on plan assets	(652)	(1,047)
Amortization of prior service cost (credit)	(274)	(259)
Recognized actuarial losses	787	65
Settlements	(102)	602
Net period benefit cost	$ 4,007	$ 3,693

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