EMPLOYEE BENEFIT PLANS (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Defined Contribution Plan Disclosure [Line Items]
Defined contribution plan, expense	$ 16,607	$ 14,099	$ 12,145
U.S. 401(k) Plan
Defined Contribution Plan Disclosure [Line Items]
Defined contribution plan, expense	5,506	5,003	4,510
International Plans
Defined Contribution Plan Disclosure [Line Items]
Defined contribution plan, expense	$ 11,101	$ 9,096	$ 7,635