Accumulated Other Comprehensive Income (Loss) - Changes in Accumulated Balances (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2020	Jun. 30, 2019
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 157,883	$ 491,714	$ 523,375	$ 666,901	$ 491,714	$ 666,901
Other comprehensive income (loss) before reclassifications	30,264		(478)		(104,283)	20,144
Amounts reclassified from accumulated other comprehensive income (loss)	(1,978)		(1,250)		(3,830)	(580)
Other Comprehensive Income (Loss), Net of Tax	28,286	(136,399)	(1,728)	21,292	(108,113)	19,564
Ending balance	86,148	157,883	426,195	523,375	86,148	426,195
Total
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(1,005,883)	(869,484)	(837,934)	(859,226)	(869,484)	(859,226)
Other Comprehensive Income (Loss), Net of Tax	28,286	(136,399)	(1,728)	21,292
Ending balance	(977,597)	(1,005,883)	(839,662)	(837,934)	(977,597)	(839,662)
Derivative Instruments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	17,021	11,041	16,470	11,411	11,041	11,411
Other comprehensive income (loss) before reclassifications	4,704		3,254		13,894	9,072
Amounts reclassified from accumulated other comprehensive income (loss)	(3,699)		(2,492)		(6,909)	(3,251)
Other Comprehensive Income (Loss), Net of Tax	1,005		762		6,985	5,821
Ending balance	18,026	17,021	17,232	16,470	18,026	17,232
Available-for-Sale Security
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(8,065)	(8,260)	(4,670)	(6,547)	(8,260)	(6,547)
Other comprehensive income (loss) before reclassifications	(80)		(1,944)		115	(67)
Amounts reclassified from accumulated other comprehensive income (loss)	0		0		0	0
Other Comprehensive Income (Loss), Net of Tax	(80)		(1,944)		115	(67)
Ending balance	(8,145)	(8,065)	(6,614)	(4,670)	(8,145)	(6,614)
Employee Benefit Plans
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(166,797)	(169,857)	(142,540)	(142,763)	(169,857)	(142,763)
Other comprehensive income (loss) before reclassifications	(1,203)		(618)		499	(1,824)
Amounts reclassified from accumulated other comprehensive income (loss)	1,721		1,242		3,079	2,671
Other Comprehensive Income (Loss), Net of Tax	518		624		3,578	847
Ending balance	(166,279)	(166,797)	(141,916)	(142,540)	(166,279)	(141,916)
Currency Translation Adjustments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(848,042)	(702,408)	(707,194)	(721,327)	(702,408)	(721,327)
Other comprehensive income (loss) before reclassifications	26,843		(1,170)		(118,791)	12,963
Amounts reclassified from accumulated other comprehensive income (loss)	0		0		0	0
Other Comprehensive Income (Loss), Net of Tax	26,843		(1,170)		(118,791)	12,963
Ending balance	$ (821,199)	$ (848,042)	$ (708,364)	$ (707,194)	$ (821,199)	$ (708,364)

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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