RETIREMENT AND DEFERRED COMPENSATION PLANS (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Domestic Plans
Change in benefit obligation:
Service cost	$ 2,420	$ 2,260
Interest cost	1,748	1,694
Change in plan assets:
Employer contribution	20,000
Components of net periodic benefit cost:
Service cost	2,420	2,260
Interest cost	1,748	1,694
Expected return on plan assets	(2,464)	(2,118)
Amortization of net loss	801	821
Net periodic benefit cost	2,505	2,657
Minimum funding requirements	0
Expected contribution in current fiscal year	24,000
Foreign Plans
Change in benefit obligation:
Service cost	1,337	1,138
Interest cost	424	473
Change in plan assets:
Employer contribution	900
Components of net periodic benefit cost:
Service cost	1,337	1,138
Interest cost	424	473
Expected return on plan assets	(568)	(545)
Amortization of net loss	447	384
Amortization of prior service cost	94	87
Net periodic benefit cost	1,734	$ 1,537
Expected contribution in current fiscal year	$ 2,500