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Retirement Plans And Other Postretirement Benefits (Narrative) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Oct. 31, 2023
Feb. 09, 2022
Dec. 31, 2023
Sep. 30, 2023
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Defined Benefit Plan Disclosure [Line Items]              
Pension settlement loss     $ 66,700 $ 25,600 $ 92,291 $ 0 $ 0
Pension lump sum distribution       64,500      
Pension Settlement Borrowings       $ 30,000      
Group annuity contract premium liability     $ 2,000   2,000 0  
Charges recognized         $ 4,000 $ 3,900 $ 3,300
Percentage of change in health care cost trend rate assumptions would be immaterial     1.00%   1.00%    
Expected long-term return on plan assets           15.10% 10.40%
Pension Benefits              
Defined Benefit Plan Disclosure [Line Items]              
Employer contributions $ 27,700 $ 50,000     $ 27,861 $ 50,184  
Pension settlement loss         92,291 0 $ 0
Defined Benefit Plan, Group Annuity Contract To Transfer Projected Benefit Obligations, Purchase Amount $ 157,500            
Projected benefit obligation to unfunded plan     $ 1,600   1,600 $ 248,114 $ 316,169
Settlement Funding Gap   $ 24,000          
Expected long-term return on plan assets           3.05% 5.00%
Unfunded Non-Qualified Supplemental Pension Plan              
Defined Benefit Plan Disclosure [Line Items]              
Projected benefit obligation to unfunded plan     1,600   1,600 $ 1,700  
Charges recognized         100 100 $ 100
Other Post-Retirement Benefits              
Defined Benefit Plan Disclosure [Line Items]              
Employer contributions         423 476  
Pension settlement loss         0 0 0
Projected benefit obligation to unfunded plan     5,712   5,712 $ 5,726 $ 7,370
Defined Benefit Plan, Expected Amortization of Gain (Loss), Next Fiscal Year     $ 100   $ 100