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Accumulated Other Comprehensive Loss (Reclassifications out of AOCI) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net of tax	$ (2,551)	$ (1,523)	$ (4,951)	$ (3,010)
Amortization of actuarial losses
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassification	(2,857)	(1,607)	(5,514)	(3,163)
Prior service costs
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassification	(138)	(138)	(279)	(276)
Pension and other post-retirement effects
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Tax benefit	444	222	842	429
Net of tax	$ (2,551)	$ (1,523)	$ (4,951)	$ (3,010)

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

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