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Retirement Plans And Other Postretirement Benefits (Components Of Net Periodic Benefit Income Or Cost For Continuing Operations) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2023
Sep. 30, 2023
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Weighted-average assumptions used to determine net periodic benefit cost:          
Expected long-term return on plan assets       15.10% 10.40%
Components of net periodic benefit cost:          
Pension settlement loss $ 66,700 $ 25,600 $ 92,291 $ 0 $ 0
Pension Benefits          
Weighted-average assumptions used to determine benefit obligations:          
Discount rate 4.89%   4.89% 5.07% 2.90%
Expected long-term return on plan assets       4.99% 3.05%
Weighted-average assumptions used to determine net periodic benefit cost:          
Discount rate(a)       2.90% 2.57%
Expected long-term return on plan assets       3.05% 5.00%
Components of net periodic benefit cost:          
Service cost     $ 0 $ 0 $ 0
Interest cost     9,623 8,945 8,398
Expected return on plan assets     (8,109) (8,174) (11,316)
Amortization of prior service costs and gains or losses     9,245 13,746 17,003
Net periodic benefit cost     10,759 14,517 14,085
Pension settlement loss     92,291 0 0
Total benefit cost     $ 103,050 $ 14,517 $ 14,085
Pension Benefits | Minimum          
Weighted-average assumptions used to determine net periodic benefit cost:          
Discount rate(a)     507.00%    
Pension Benefits | Maximum          
Weighted-average assumptions used to determine net periodic benefit cost:          
Discount rate(a)     537.00%    
Other Post-Retirement Benefits          
Weighted-average assumptions used to determine benefit obligations:          
Discount rate 4.98%   4.98% 5.17% 2.86%
Weighted-average assumptions used to determine net periodic benefit cost:          
Discount rate(a)     5.17% 2.86% 2.54%
Components of net periodic benefit cost:          
Service cost     $ 10 $ 18 $ 21
Interest cost     288 207 195
Expected return on plan assets     0 0 0
Amortization of prior service costs and gains or losses     (213) (140) (141)
Net periodic benefit cost     85 85 75
Pension settlement loss     0 0 0
Total benefit cost     $ 85 $ 85 $ 75