RETIREMENT AND DEFERRED COMPENSATION PLANS (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2016	Mar. 31, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Domestic Plans
Change in benefit obligation:
Service cost	$ 2,261		$ 2,504	$ 6,781	$ 7,512
Interest cost	1,694		1,589	5,082	4,767
Change in plan assets:
Employer contribution		$ 10,000
Components of net periodic benefit cost:
Service cost	2,261		2,504	6,781	7,512
Interest cost	1,694		1,589	5,082	4,767
Expected return on plan assets	(2,118)		(1,898)	(6,353)	(5,693)
Amortization of net loss	820		1,351	2,462	4,053
Net periodic benefit cost	2,657		3,546	7,972	10,639
Minimum funding requirements				0
Foreign Plans
Change in benefit obligation:
Service cost	1,148		1,145	3,449	3,444
Interest cost	477		414	1,432	1,246
Change in plan assets:
Employer contribution				1,500
Components of net periodic benefit cost:
Service cost	1,148		1,145	3,449	3,444
Interest cost	477		414	1,432	1,246
Expected return on plan assets	(550)		(449)	(1,651)	(1,351)
Amortization of net loss	388		420	1,165	1,263
Amortization of prior service cost	89		64	265	193
Net periodic benefit cost	$ 1,552		$ 1,594	4,660	$ 4,795
Expected contribution in current fiscal year				$ 4,500