ACCUMULATED OTHER COMPREHENSIVE LOSS - Related Tax Effects Allocated to Each Component of Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Accumulated Other Comprehensive Loss [Line Items]
Gross Amount	$ 3,516	$ (2,866)	$ 5,475	$ 2,807
Tax provision attributable to other comprehensive income (loss)	$ (782)	$ (167)	(1,230)	(1,318)
Net Amount			4,245	1,489
Foreign currency translation adjustments
Accumulated Other Comprehensive Loss [Line Items]
Gross Amount			6,556	3,050
Tax provision attributable to other comprehensive income (loss)			(1,649)	(1,414)
Net Amount			4,907	1,636
Foreign currency hedge
Accumulated Other Comprehensive Loss [Line Items]
Gross Amount			(1,115)	(243)
Tax provision attributable to other comprehensive income (loss)			426	96
Net Amount			(689)	(147)
Defined benefit pension plans
Accumulated Other Comprehensive Loss [Line Items]
Gross Amount			34	0
Tax provision attributable to other comprehensive income (loss)			(7)	0
Net Amount			$ 27	$ 0