CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020
Statement of Comprehensive Income [Abstract]
Net loss	$ 28,424	$ (131,567)	$ (55,951)	$ (181,986)	$ (25,281)	$ (129,633)	$ (159,094)	$ (336,900)
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Interest rate swaps	333			1,092			1,884	(2,052)
Defined benefit pension plans	(4)			(15)			(12)	(57)
Foreign currency translation adjustment	(241,420)			9,359			(176,246)	1,795
Total other comprehensive loss, net of tax	(241,091)	47,124	19,593	10,436	(2,280)	(8,470)	(174,374)	(314)
Comprehensive loss	(212,667)			(171,550)			(333,468)	(337,214)
Net loss	28,424	(131,567)	(55,951)	(181,986)	(25,281)	(129,633)	(159,094)	(336,900)
Interest rate swaps	333			1,092			1,884	(2,052)
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax	4			15			12	57
Foreign currency translation adjustment	(241,420)			9,359			(176,246)	1,795
Other Comprehensive Income (Loss), Net of Tax	(241,091)	$ 47,124	$ 19,593	10,436	$ (2,280)	$ (8,470)	(174,374)	(314)
Other comprehensive loss	$ (212,667)			$ (171,550)			$ (333,468)	$ (337,214)