Accumulated Other Comprehensive Loss - Changes in Accumulated Loss by Component (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance	$ 786,261	$ 416,338	$ 712,054	$ 462,154
Other comprehensive loss before reclassifications	(2,448)	11,989	(12,284)	(33,147)
Income tax	0	428	(611)	5,074
Other comprehensive loss before reclassifications, net of tax	(2,448)	12,417	(12,895)	(28,073)
Amounts reclassified from accumulated other comprehensive loss	48	18,820	25,722	20,293
Income tax	(12)	(710)	(7,336)	(1,098)
Amounts reclassified from accumulated other comprehensive loss, net of tax	36	18,110	18,386	19,195
Total other comprehensive income (loss), net of tax	(2,412)	30,527	5,491	(8,878)
Ending Balance	848,019	395,162	848,019	395,162
Retirement Plans
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance	(18,326)	(14,521)	(18,447)	(14,691)
Other comprehensive loss before reclassifications	0	0	0	0
Income tax	0	0	0	0
Other comprehensive loss before reclassifications, net of tax	0	0	0	0
Amounts reclassified from accumulated other comprehensive loss	48	639	204	853
Income tax	(12)	(44)	(47)	(88)
Amounts reclassified from accumulated other comprehensive loss, net of tax	36	595	157	765
Total other comprehensive income (loss), net of tax	36	595	157	765
Ending Balance	(18,290)	(13,926)	(18,290)	(13,926)
Currency Translation Adjustments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance	(12,280)	(53,479)	(18)	(25,301)
Other comprehensive loss before reclassifications	(2,448)	14,428	(14,710)	(13,750)
Income tax	0	0	0	0
Other comprehensive loss before reclassifications, net of tax	(2,448)	14,428	(14,710)	(13,750)
Amounts reclassified from accumulated other comprehensive loss	0	15,580	0	15,580
Income tax	0	0	0	0
Amounts reclassified from accumulated other comprehensive loss, net of tax	0	15,580	0	15,580
Total other comprehensive income (loss), net of tax	(2,448)	30,008	(14,710)	1,830
Ending Balance	(14,728)	(23,471)	(14,728)	(23,471)
Derivatives
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance	0	(24,112)	(20,044)	(12,715)
Other comprehensive loss before reclassifications	0	(2,439)	2,426	(19,397)
Income tax	0	428	(611)	5,074
Other comprehensive loss before reclassifications, net of tax	0	(2,011)	1,815	(14,323)
Amounts reclassified from accumulated other comprehensive loss	0	2,601	25,518	3,860
Income tax	0	(666)	(7,289)	(1,010)
Amounts reclassified from accumulated other comprehensive loss, net of tax	0	1,935	18,229	2,850
Total other comprehensive income (loss), net of tax	0	(76)	20,044	(11,473)
Ending Balance	0	(24,188)	0	(24,188)
Accumulated Other Comprehensive Loss
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance	(30,606)	(92,112)	(38,509)	(52,707)
Ending Balance	$ (33,018)	$ (61,585)	$ (33,018)	$ (61,585)