Savings Plans, Pension Plans and Other Postretirement Employee Benefits (Assets within Defined Benefit Pension Plans Invested) (Details) - Pension Plans [Member] - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Fair Value of Plan Assets	$ 177,875	$ 172,246	$ 329,796
Cash and Cash Equivalents [Member]
Fair Value of Plan Assets	3,009	3,690
Global Equities [Member]
Fair Value of Plan Assets	34,534	33,974
Fixed Income Securities [Member]
Fair Value of Plan Assets	131,837	126,358
Alternative Securities [Member]
Fair Value of Plan Assets	8,495	8,224
Level 1
Fair Value of Plan Assets	160,262	153,445
Level 1 | Cash and Cash Equivalents [Member]
Fair Value of Plan Assets	3,009	3,690
Level 1 | Global Equities [Member]
Fair Value of Plan Assets	34,534	33,974
Level 1 | Fixed Income Securities [Member]
Fair Value of Plan Assets	114,224	107,557
Level 1 | Alternative Securities [Member]
Fair Value of Plan Assets	8,495	8,224
Level 2 [Member]
Fair Value of Plan Assets	17,613	18,801
Level 2 [Member] | Cash and Cash Equivalents [Member]
Fair Value of Plan Assets	0	0
Level 2 [Member] | Global Equities [Member]
Fair Value of Plan Assets	0	0
Level 2 [Member] | Fixed Income Securities [Member]
Fair Value of Plan Assets	17,613	18,801
Level 2 [Member] | Alternative Securities [Member]
Fair Value of Plan Assets	$ 0	$ 0