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Accumulated Other Comprehensive Income (Loss) (Components of AOCI) (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended		12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2019
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	$ (594,004)	$ (629,424)	$ (648,044)	$ (603,648)	$ (579,198)	$ (579,198)
Other comprehensive income (loss) before reclassifications	(14,608)		15,949	(10,478)	(57,848)
Amounts reclassified from AOCL	2,655		2,671	8,169	7,622
Other comprehensive income (loss)	(11,953)	25,665	18,620	(2,309)	(50,226)	(24,562)
Ending balance	(605,957)	(603,648)	(629,424)	(605,957)	(629,424)	(603,648)
Foreign currency translation items
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(453,328)	(498,822)	(518,377)	(456,437)	(441,366)	(441,366)
Other comprehensive income (loss) before reclassifications	(15,561)		19,555	(12,452)	(57,456)
Amounts reclassified from AOCL	0		0	0	0
Other comprehensive income (loss)	(15,561)		19,555	(12,452)	(57,456)
Ending balance	(468,889)	(456,437)	(498,822)	(468,889)	(498,822)	(456,437)
Pension and other post-retirement effects
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(140,405)	(130,070)	(129,094)	(146,723)	(137,161)	(137,161)
Other comprehensive income (loss) before reclassifications	2,300		(3,647)	3,104	(531)
Amounts reclassified from AOCL	2,655		2,671	8,169	7,622
Other comprehensive income (loss)	4,955		(976)	11,273	7,091
Ending balance	(135,450)	(146,723)	(130,070)	(135,450)	(130,070)	(146,723)
Cash flow hedging activity
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(271)	(532)	(573)	(488)	(671)	(671)
Other comprehensive income (loss) before reclassifications	(1,347)		41	(1,130)	139
Amounts reclassified from AOCL	0		0	0	0
Other comprehensive income (loss)	(1,347)		41	(1,130)	139
Ending balance	(1,618)	(488)	(532)	(1,618)	(532)	(488)
Non- controlling Interests
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Other comprehensive income (loss)	(3)		(4)	159	772
Accumulated other comprehensive income (loss), foreign currency translation adjustment, net of tax	$ 6,100	$ 5,900	$ 5,800	$ 6,100	$ 5,800	$ 5,900	$ 6,100	$ 5,900	$ 5,100

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Accumulated Other Comprehensive Income (Loss), Including Portion Attributable to Noncontrolling Interest, Net of Tax

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Accumulated adjustment, net of tax, that results from the process of translating subsidiary financial statements and foreign equity investments into the reporting currency from the functional currency of the reporting entity, net of reclassification of realized foreign currency translation gains or losses.

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

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