ACCUMULATED OTHER COMPREHENSIVE LOSS - Schedule of Components of Accumulated Other Comprehensive Income, Net of Tax (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2015 USD ($)
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Balance as of December 31, 2014	$ (8,182)
Other comprehensive (loss) gain	(6,962)
Balance as of September 30, 2015	(15,144)
Foreign currency translation adjustments
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Balance as of December 31, 2014	1,053
Other comprehensive (loss) gain	(7,535)
Balance as of September 30, 2015	(6,482)
Defined benefit pension plans
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Balance as of December 31, 2014	(8,462)
Other comprehensive (loss) gain	(803)
Balance as of September 30, 2015	(9,265)
Change in unrealized loss on investments
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Balance as of December 31, 2014	(773)
Other comprehensive (loss) gain	1,376
Balance as of September 30, 2015	$ 603