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RETIREMENT BENEFIT PLANS (Schedule of Change in Benefit Obligations and Plan Assets) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Change In Projected Benefit Obligations    
Projected benefit obligations, beginning of year $ 66,972 $ 52,542
Interest cost 219 517
Service cost 4,029 3,815
Actuarial (gain) loss (3,347) 12,188
Plan amendments 0 (3,133)
Plan settlements (77) (2,664)
Employee contribution 883 899
Premiums paid (388) (395)
Benefit payment (1,537) (635)
Plans transferred in 0 3,199
Effect of foreign currency exchange rates 6,115 639
Projected benefit obligations, end of year 72,869 66,972
Change In Plan Assets    
Plan assets at fair value, beginning of year 30,770 31,103
Actual return on plan assets 2,882 (152)
Employer contributions 2,274 2,189
Employee contributions 883 899
Plan settlements (56) (2,645)
Benefits paid (1,537) (635)
Premiums paid (388) (395)
Effect of foreign currency exchange rates 2,997 406
Plan assets at fair value, end of year $ 37,825 $ 30,770