COMPREHENSIVE INCOME - Schedule of Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Equity [Abstract]
Net income	$ 6,394	$ 13,419
Foreign currency translation adjustment	4,064	11,244
Change in unrealized gain on derivatives, net of tax	347	0
Unrealized gain on short-term investments	1,292	0
Pension liability adjustment, net of tax	(2)	(7)
Comprehensive income, net	$ 12,095	$ 24,656