ACCUMULATED OTHER COMPREHENSIVE LOSS - Related Tax Effects Allocated to Each Component of Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Accumulated Other Comprehensive Loss [Line Items]
Gross Amount	$ 2,088	$ (547)
Tax (provision) benefit attributable to other comprehensive income (loss)	(69)	230
Other comprehensive income (loss), net of tax	2,019	(317)
Foreign currency translation adjustments
Accumulated Other Comprehensive Loss [Line Items]
Gross Amount	1,809	(126)
Tax (provision) benefit attributable to other comprehensive income (loss)	0	124
Other comprehensive income (loss), net of tax	1,809	(2)
Foreign currency hedge
Accumulated Other Comprehensive Loss [Line Items]
Gross Amount	279	(421)
Tax (provision) benefit attributable to other comprehensive income (loss)	(69)	106
Other comprehensive income (loss), net of tax	210	(315)
Defined benefit pension plans
Accumulated Other Comprehensive Loss [Line Items]
Gross Amount	$ 0	$ 0