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Accumulated Other Comprehensive Loss (Reclassifications out of AOCI) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net of tax	$ (2,671)	$ (1,464)	$ (7,622)	$ (4,475)
Amortization of actuarial losses
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassification	(2,942)	(1,564)	(8,456)	(4,727)
Prior service costs
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassification	(150)	(131)	(429)	(408)
Pension and other post-retirement effects
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Tax benefit	421	231	1,263	660
Net of tax	$ (2,671)	$ (1,464)	$ (7,622)	$ (4,475)

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

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