RETIREMENT AND DEFERRED COMPENSATION PLANS (Details) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2016	Mar. 31, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Domestic Plans
Change in benefit obligation:
Service cost	$ 2,260		$ 2,504	$ 4,520	$ 5,008
Interest cost	1,694		1,589	3,388	3,178
Change in plan assets:
Employer contribution		$ 10,000
Components of net periodic benefit cost:
Service cost	2,260		2,504	4,520	5,008
Interest cost	1,694		1,589	3,388	3,178
Expected return on plan assets	(2,117)		(1,897)	(4,235)	(3,795)
Amortization of net loss	821		1,351	1,642	2,702
Net periodic benefit cost	2,658		3,547	5,315	7,093
Minimum funding requirements				0
Foreign Plans
Change in benefit obligation:
Service cost	1,163		1,139	2,301	2,299
Interest cost	482		412	955	832
Change in plan assets:
Employer contribution				1,200
Components of net periodic benefit cost:
Service cost	1,163		1,139	2,301	2,299
Interest cost	482		412	955	832
Expected return on plan assets	(556)		(447)	(1,101)	(902)
Amortization of net loss	393		418	777	843
Amortization of prior service cost	89		64	176	129
Net periodic benefit cost	$ 1,571		$ 1,586	3,108	$ 3,201
Expected contribution in current fiscal year				$ 5,000