Accumulated Other Comprehensive Income (Loss) - Changes in Accumulated Balances (Details) - 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
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 527,719	$ 490,565	$ 610,144	$ 106,100	$ 179,772	$ 508,564	$ 610,144	$ 508,564
Other comprehensive income (loss) before reclassifications	(16,680)			(7,800)			(11,578)	(109,955)
Amounts reclassified from accumulated other comprehensive income (loss)	1,345			(477)			5,503	(6,435)
Other Comprehensive Loss, Net of Tax	(15,335)	25,710	(16,450)	(8,277)	28,286	(136,399)	(6,075)	(116,390)
Ending balance	1,313,678	527,719	490,565	419,803	106,100	179,772	1,313,678	419,803
Total
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(935,316)	(961,026)	(944,576)	(977,597)	(1,005,883)	(869,484)	(944,576)	(869,484)
Other Comprehensive Loss, Net of Tax	(15,335)	25,710	(16,450)	(8,277)	28,286	(136,399)
Ending balance	(950,651)	(935,316)	(961,026)	(985,874)	(977,597)	(1,005,883)	(950,651)	(985,874)
Derivative Instruments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(6,709)		(15,369)	18,026		11,041	(15,369)	11,041
Other comprehensive income (loss) before reclassifications	13,900			(20,578)			23,230	(4,556)
Amounts reclassified from accumulated other comprehensive income (loss)	(2,223)			(2,200)			(2,893)	(11,237)
Other Comprehensive Loss, Net of Tax	11,677			(22,778)			20,337	(15,793)
Ending balance	4,968	(6,709)		(4,752)	18,026		4,968	(4,752)
Available-for-Sale Security
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(4,290)		(7,522)	(8,145)		(8,260)	(7,522)	(8,260)
Other comprehensive income (loss) before reclassifications	(1,320)			178			1,912	293
Amounts reclassified from accumulated other comprehensive income (loss)	0			0			0	0
Other Comprehensive Loss, Net of Tax	(1,320)			178			1,912	293
Ending balance	(5,610)	(4,290)		(7,967)	(8,145)		(5,610)	(7,967)
Employee Benefit Plans
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(182,285)		(186,854)	(166,279)		(169,857)	(186,854)	(169,857)
Other comprehensive income (loss) before reclassifications	56			(432)			(203)	67
Amounts reclassified from accumulated other comprehensive income (loss)	3,568			1,723			8,396	4,802
Other Comprehensive Loss, Net of Tax	3,624			1,291			8,193	4,869
Ending balance	(178,661)	(182,285)		(164,988)	(166,279)		(178,661)	(164,988)
Currency Translation Adjustments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(742,032)		$ (734,831)	(821,199)		$ (702,408)	(734,831)	(702,408)
Other comprehensive income (loss) before reclassifications	(29,316)			13,032			(36,517)	(105,759)
Amounts reclassified from accumulated other comprehensive income (loss)	0			0			0	0
Other Comprehensive Loss, Net of Tax	(29,316)			13,032			(36,517)	(105,759)
Ending balance	$ (771,348)	$ (742,032)		$ (808,167)	$ (821,199)		$ (771,348)	$ (808,167)

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount after tax, before reclassification adjustments, of other comprehensive income (loss), attributable to parent.

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Amount after tax of other comprehensive income (loss) attributable to parent entity.

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