RETIREMENT BENEFIT PLANS (Schedule of Change in Benefit Obligations and Plan Assets) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Change In Projected Benefit Obligations
Projected benefit obligations, beginning of year	$ 52,542	$ 47,661
Interest cost	517	351
Service cost	3,815	2,704
Actuarial loss	12,188	762
Plan amendments	(3,133)	0
Plan settlements	(2,664)	0
Employee contribution	899	641
Premiums paid	(395)	0
Benefit payment	(635)	(1,483)
Plans transferred in	3,199	2,280
Effect of foreign currency exchange rates	639	(374)
Projected benefit obligations, end of year	66,972	52,542
Change In Plan Assets
Plan assets at fair value, beginning of year	31,103	26,943
Actual return on plan assets	(152)	1,802
Employer contributions	2,189	1,720
Employee contributions	899	641
Plan settlements	(2,645)	0
Benefits paid	(635)	(1,463)
Premiums paid	(395)	0
Plans transferred in	0	1,589
Effect of foreign currency exchange rates	406	(129)
Plan assets at fair value, end of year	$ 30,770	$ 31,103