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Accumulated Other Comprehensive Income (Details 2) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Unrealized Gain (Loss) on Foreign Currency Derivatives, Net, before Tax	$ 1,242	$ (3,769)	$ 7,000	$ (6,329)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, Tax	(201)	440	(1,227)	805
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax	1,041	(3,329)	5,773	(5,524)
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, before Tax, Portion Attributable to Parent	6,449	4,746	19,460	13,835
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Tax, Portion Attributable to Parent	1,361	1,047	4,105	3,037
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax	5,088	3,699	15,355	10,798
Interest Rate Swap [Member]
Interest Rate Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net	551	833	1,625	1,774
Cross Currency Swap [Member]
Interest Rate Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net	(1,793)	$ 2,936	(8,625)	$ 4,555
Foreign Currency Transaction Gain (Loss), Unrealized	1,500		7,500
Interest Income, Other	$ 300		$ 1,100

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Amount before tax of foreign currency transaction unrealized gain (loss) recognized in the income statement.

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