ACCUMULATED OTHER COMPREHENSIVE INCOME/(LOSS) - Reclassifications out of Accumulated Other Comprehensive Income/(Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Amount Reclassified from Accumulated Other Comprehensive Income
Income before Income Taxes	$ (374,825)	$ (334,704)	$ (321,655)
Tax benefit	90,649	95,149	78,017
Interest expense	40,418	40,827	30,284
Miscellaneous income (expense), net	(3,212)	4,799	3,094
Net Income	(284,176)	(239,555)	(243,638)
Amount Reclassified from Accumulated Other Comprehensive Income
Amount Reclassified from Accumulated Other Comprehensive Income
Net Income	771	6,432	2,150
Defined Benefit Pension Plans | Amount Reclassified from Accumulated Other Comprehensive Income
Amount Reclassified from Accumulated Other Comprehensive Income
Amortization of net loss	914	8,358	12,424
Amortization of prior service cost	177	177	166
Income before Income Taxes	1,091	8,535	12,590
Tax benefit	(320)	(2,149)	(3,163)
Net Income	771	6,386	9,427
Derivatives | Amount Reclassified from Accumulated Other Comprehensive Income
Amount Reclassified from Accumulated Other Comprehensive Income
Net Income	0	46	(7,277)
Derivatives | Changes in cross currency swap: interest component | Amount Reclassified from Accumulated Other Comprehensive Income
Amount Reclassified from Accumulated Other Comprehensive Income
Interest expense	0	(171)	(13)
Derivatives | Changes in cross currency swap: foreign exchange component | Amount Reclassified from Accumulated Other Comprehensive Income
Amount Reclassified from Accumulated Other Comprehensive Income
Miscellaneous income (expense), net	$ 0	$ 217	$ (7,264)