RETIREMENT AND DEFERRED COMPENSATION PLANS (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
United States
Change in benefit obligation:
Service cost	$ 2,772	$ 2,853	$ 8,320	$ 8,546
Interest cost	1,845	1,713	5,536	5,139
Change in plan assets:
Employer contribution			365
Components of net periodic benefit cost:
Service cost	2,772	2,853	8,320	8,546
Interest cost	1,845	1,713	5,536	5,139
Expected return on plan assets	(3,095)	(2,803)	(9,284)	(8,409)
Amortization of net loss	490	1,214	1,468	3,642
Net periodic benefit cost	2,012	2,977	6,040	8,918
Minimum funding requirements			0
Foreign Plans
Change in benefit obligation:
Service cost	1,429	1,457	4,334	4,479
Interest cost	491	445	1,487	1,374
Change in plan assets:
Employer contribution			1,500
Components of net periodic benefit cost:
Service cost	1,429	1,457	4,334	4,479
Interest cost	491	445	1,487	1,374
Expected return on plan assets	(581)	(645)	(1,759)	(1,982)
Amortization of net loss	356	422	1,078	1,301
Amortization of prior service cost	111	122	337	376
Net periodic benefit cost	1,806	$ 1,801	5,477	$ 5,548
Expected contribution in current fiscal year	$ 4,300		$ 4,300