ACCUMULATED OTHER COMPREHENSIVE INCOME/(LOSS) - Changes in Accumulated Other Comprehensive Income/(Loss) by Component (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Accumulated other comprehensive income activity
Balance at the beginning of the period	$ 1,850,389
Other comprehensive (loss) income before reclassifications	(36,482)	$ 44,538	$ (26,254)
Amounts reclassified from accumulated other comprehensive income (loss)	2,150	15,701	(5,190)
Net current-period other comprehensive (loss) income	(34,332)	60,239	(31,444)
Balance at the end of the period	1,969,407	1,850,389
Accumulated Other Comprehensive (Loss)Income
Accumulated other comprehensive income activity
Balance at the beginning of the period	(281,709)	(341,948)	(310,504)
Balance at the end of the period	(316,041)	(281,709)	(341,948)
Foreign Currency
Accumulated other comprehensive income activity
Balance at the beginning of the period	(178,025)	(257,124)	(248,401)
Other comprehensive (loss) income before reclassifications	(71,475)	79,099	(8,723)
Amounts reclassified from accumulated other comprehensive income (loss)	0	0	0
Net current-period other comprehensive (loss) income	(71,475)	79,099	(8,723)
Balance at the end of the period	(249,500)	(178,025)	(257,124)
Defined Benefit Pension Plans
Accumulated other comprehensive income activity
Balance at the beginning of the period	(102,322)	(83,147)	(60,463)
Other comprehensive (loss) income before reclassifications	26,409	(25,389)	(25,557)
Amounts reclassified from accumulated other comprehensive income (loss)	9,427	6,214	2,873
Net current-period other comprehensive (loss) income	35,836	(19,175)	(22,684)
Balance at the end of the period	(66,486)	(102,322)	(83,147)
Derivatives
Accumulated other comprehensive income activity
Balance at the beginning of the period	(1,362)	(1,677)	(1,640)
Other comprehensive (loss) income before reclassifications	8,584	(9,172)	8,026
Amounts reclassified from accumulated other comprehensive income (loss)	(7,277)	9,487	(8,063)
Net current-period other comprehensive (loss) income	1,307	315	(37)
Balance at the end of the period	$ (55)	$ (1,362)	$ (1,677)