COMPREHENSIVE INCOME - Schedule of Changes in Accumulated Other Comprehensive Income by Component (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2017 USD ($)
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	$ 839,667
Other comprehensive (loss) income	1,292
Ending balance	852,491
Gain on Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	1,071
Other comprehensive (loss) income	347
Ending balance	1,418
Defined Benefit Pension Items
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(36)
Other comprehensive (loss) income	(2)
Ending balance	(38)
Foreign Currency Items
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(58,189)
Other comprehensive (loss) income	4,064
Ending balance	(54,125)
Gain on Short-term Investment
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	0
Ending balance	1,292
Total
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(57,154)
Other comprehensive (loss) income	5,701
Ending balance	$ (51,453)