Pensions and Other Postretirement Plans (Consolidated Balance Sheet) (Details 2) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Defined Benefit Plan Disclosure [Line Items]
Noncurrent asset	$ 2,306,514	$ 1,708,305
Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Noncurrent asset	2,306,514	1,708,305
Current liability	0	0
Noncurrent liability	0	0
Recognized asset (liability)	2,306,514	1,708,305
Supplemental Executive Retirement Plan (SERP) [Member]
Defined Benefit Plan Disclosure [Line Items]
Noncurrent asset	0	0
Current liability	(6,334)	(6,495)
Noncurrent liability	(106,372)	(115,804)
Recognized asset (liability)	(112,706)	(122,299)
Other Postretirement Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Current liability	(671)	(797)
Noncurrent liability	(4,051)	(4,790)
Recognized asset (liability)	$ (4,722)	$ (5,587)

Amount of asset (liability), recognized in statement of financial position, for defined benefit pension and other postretirement plans.

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Amount of asset, recognized in statement of financial position, for overfunded defined benefit pension and other postretirement plans.

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