Accumulated Other Comprehensive Income (Loss) - Changes in Accumulated Balances (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2020	Sep. 30, 2019
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 86,148	$ 157,883	$ 491,714	$ 426,195	$ 523,375	$ 666,901	$ 491,714	$ 666,901
Other comprehensive income (loss) before reclassifications	(2,931)			(36,007)			(107,214)	(15,863)
Amounts reclassified from accumulated other comprehensive income (loss)	(5,346)			(5,152)			(9,176)	(5,732)
Other Comprehensive Loss, Net of Tax	(8,277)	28,286	(136,399)	(41,159)	(1,728)	21,292	(116,390)	(21,595)
Ending balance	404,507	86,148	157,883	463,756	426,195	523,375	404,507	463,756
Total
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(977,597)	(1,005,883)	(869,484)	(839,662)	(837,934)	(859,226)	(869,484)	(859,226)
Other Comprehensive Loss, Net of Tax	(8,277)	28,286	(136,399)	(41,159)	(1,728)	21,292
Ending balance	(985,874)	(977,597)	(1,005,883)	(880,821)	(839,662)	(837,934)	(985,874)	(880,821)
Derivative Instruments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	18,026		11,041	17,232		11,411	11,041	11,411
Other comprehensive income (loss) before reclassifications	(15,709)			12,996			(1,815)	22,068
Amounts reclassified from accumulated other comprehensive income (loss)	(7,069)			(6,394)			(13,978)	(9,645)
Other Comprehensive Loss, Net of Tax	(22,778)			6,602			(15,793)	12,423
Ending balance	(4,752)	18,026		23,834	17,232		(4,752)	23,834
Available-for-Sale Security
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(8,145)		(8,260)	(6,614)		(6,547)	(8,260)	(6,547)
Other comprehensive income (loss) before reclassifications	178			(1,922)			293	(1,989)
Amounts reclassified from accumulated other comprehensive income (loss)	0			0			0	0
Other Comprehensive Loss, Net of Tax	178			(1,922)			293	(1,989)
Ending balance	(7,967)	(8,145)		(8,536)	(6,614)		(7,967)	(8,536)
Employee Benefit Plans
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(166,279)		(169,857)	(141,916)		(142,763)	(169,857)	(142,763)
Other comprehensive income (loss) before reclassifications	(432)			(359)			67	(2,183)
Amounts reclassified from accumulated other comprehensive income (loss)	1,723			1,242			4,802	3,913
Other Comprehensive Loss, Net of Tax	1,291			883			4,869	1,730
Ending balance	(164,988)	(166,279)		(141,033)	(141,916)		(164,988)	(141,033)
Currency Translation Adjustments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(821,199)		$ (702,408)	(708,364)		$ (721,327)	(702,408)	(721,327)
Other comprehensive income (loss) before reclassifications	13,032			(46,722)			(105,759)	(33,759)
Amounts reclassified from accumulated other comprehensive income (loss)	0			0			0	0
Other Comprehensive Loss, Net of Tax	13,032			(46,722)			(105,759)	(33,759)
Ending balance	$ (808,167)	$ (821,199)		$ (755,086)	$ (708,364)		$ (808,167)	$ (755,086)

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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