Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Statement Of Income And Comprehensive Income [Abstract]
Net income (loss)	$ 1,695	$ (43,218)	$ 14,817	$ (233,300)
Other comprehensive income (loss), net of tax:
Foreign currency translation gain (loss)	8,410	9,443	(7,268)	(26,090)
Change in unrecognized gains (losses) on derivative instruments:
Change in fair value of derivatives	17,165	19,673	8,025	(38,752)
Tax (provision) benefit	(1,718)	(4,375)	(1,040)	8,753
Change in unrecognized gains (losses) on derivative instruments, net of tax	15,447	15,298	6,985	(29,999)
Defined benefit pension plan:
Actuarial gains on pension obligation, net of amortization	97	72	194	144
Tax benefit (provision)	21	(13)		(30)
Pension changes, net of tax	118	59	194	114
Other comprehensive income (loss), net of tax	23,975	24,800	(89)	(55,975)
Comprehensive income (loss)	$ 25,670	$ (18,418)	$ 14,728	$ (289,275)