COMPREHENSIVE INCOME - Schedule of Changes in Accumulated Other Comprehensive Income by Component (Details) - USD ($) $ in Thousands		3 Months Ended						9 Months Ended
	Jan. 01, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Sep. 30, 2018
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance, Beginning of Period	$ 962,306	$ 1,341,905	$ 998,440	$ 962,306	$ 894,554	$ 852,491	$ 839,667	$ 962,306
Reclassification of stranded tax effect	(532)
Other comprehensive income (loss)								4,310
Amounts reclassified from accumulated other comprehensive income								6,242
Net current-period other comprehensive income (loss)		(965)	(22,578)	21,612	10,375	17,295	5,701	(1,932)
Balance, End of Period		1,365,081	1,341,905	998,440	913,116	894,554	852,491	1,365,081
Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance, Beginning of Period	(2,979)			(2,979)				(2,979)
Reclassification of stranded tax effect	(532)
Other comprehensive income (loss)								20,661
Amounts reclassified from accumulated other comprehensive income								6,242
Net current-period other comprehensive income (loss)								14,419
Balance, End of Period	(3,511)	10,908						10,908
Defined Benefit Pension Items
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance, Beginning of Period	(93)			(93)				(93)
Reclassification of stranded tax effect	0
Other comprehensive income (loss)								8
Amounts reclassified from accumulated other comprehensive income								0
Net current-period other comprehensive income (loss)								8
Balance, End of Period	(93)	(85)						(85)
Foreign Currency Items
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance, Beginning of Period	(20,735)			(20,735)				(20,735)
Reclassification of stranded tax effect	0
Other comprehensive income (loss)								(16,359)
Amounts reclassified from accumulated other comprehensive income								0
Net current-period other comprehensive income (loss)								(16,359)
Balance, End of Period	(20,735)	(37,094)						(37,094)
Total
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance, Beginning of Period	(23,807)	(25,306)	(1,663)	(23,807)	(34,158)	(51,453)	(57,154)	(23,807)
Net current-period other comprehensive income (loss)		(965)	(23,643)	22,144	10,375	17,295	5,701
Balance, End of Period	$ (24,339)	$ (26,271)	$ (25,306)	$ (1,663)	$ (23,783)	$ (34,158)	$ (51,453)	$ (26,271)