Accumulated Other Comprehensive Income (Loss) - Changes in Accumulated Balances (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2021	Jun. 30, 2020
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 490,565	$ 610,144	$ 179,772	$ 508,564	$ 610,144	$ 508,564
Other comprehensive income (loss) before reclassifications	21,175		28,154		5,103	(102,155)
Amounts reclassified from accumulated other comprehensive loss	4,535		132		4,157	(5,958)
Other Comprehensive Income (Loss), Net of Tax	25,710	(16,450)	28,286	(136,399)	9,260	(108,113)
Ending balance	527,719	490,565	106,100	179,772	527,719	106,100
Total
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(961,026)	(944,576)	(1,005,883)	(869,484)	(944,576)	(869,484)
Other Comprehensive Income (Loss), Net of Tax	25,710	(16,450)	28,286	(136,399)
Ending balance	(935,316)	(961,026)	(977,597)	(1,005,883)	(935,316)	(977,597)
Derivative Instruments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(7,998)	(15,369)	17,021	11,041	(15,369)	11,041
Other comprehensive income (loss) before reclassifications	(771)		2,594		9,331	16,022
Amounts reclassified from accumulated other comprehensive loss	2,060		(1,589)		(671)	(9,037)
Other Comprehensive Income (Loss), Net of Tax	1,289		1,005		8,660	6,985
Ending balance	(6,709)	(7,998)	18,026	17,021	(6,709)	18,026
Available-for-Sale Security
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(5,558)	(7,522)	(8,065)	(8,260)	(7,522)	(8,260)
Other comprehensive income (loss) before reclassifications	1,268		(80)		3,232	115
Amounts reclassified from accumulated other comprehensive loss	0		0		0	0
Other Comprehensive Income (Loss), Net of Tax	1,268		(80)		3,232	115
Ending balance	(4,290)	(5,558)	(8,145)	(8,065)	(4,290)	(8,145)
Employee Benefit Plans
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(184,506)	(186,854)	(166,797)	(169,857)	(186,854)	(169,857)
Other comprehensive income (loss) before reclassifications	(254)		(1,203)		(259)	499
Amounts reclassified from accumulated other comprehensive loss	2,475		1,721		4,828	3,079
Other Comprehensive Income (Loss), Net of Tax	2,221		518		4,569	3,578
Ending balance	(182,285)	(184,506)	(166,279)	(166,797)	(182,285)	(166,279)
Currency Translation Adjustments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(762,964)	(734,831)	(848,042)	(702,408)	(734,831)	(702,408)
Other comprehensive income (loss) before reclassifications	20,932		26,843		(7,201)	(118,791)
Amounts reclassified from accumulated other comprehensive loss	0		0		0	0
Other Comprehensive Income (Loss), Net of Tax	20,932		26,843		(7,201)	(118,791)
Ending balance	$ (742,032)	$ (762,964)	$ (821,199)	$ (848,042)	$ (742,032)	$ (821,199)

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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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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