Pension Plans And Other Postretirement Benefits (Narrative) (Details) - Pension Benefits [Member] $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2021 USD ($)	Dec. 31, 2020 USD ($) item	May 01, 2021 item
Defined Benefit Plan Disclosure [Line Items]
Cash contributions made by the Company	$ 14,775
Curtailment Loss		$ 3,212
Increase (Decrease) in Obligation, Pension Benefits		20,732
Measurement Input, Discount Rate [Member]
Defined Benefit Plan Disclosure [Line Items]
Increase (Decrease) in Obligation, Pension Benefits		$ 17,520
Servicing Asset, Measurement Input | item		0.0257	0.0308