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Retirement Plans And Other Postretirement Benefits (Narrative) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Feb. 09, 2022
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Defined Benefit Plan Disclosure [Line Items]        
Percentage of change in health care cost trend rate assumptions would be immaterial   1.00%    
Defined Benefit Average Remaining Duration Of Benefit Payments For Pension Plan   9 years 7 months 6 days    
Defined Benefit Plan, Expected Future Pension Expense, Next Twelve Months   $ 14,000    
Expected long-term return on plan assets   15.10% 10.40% 10.90%
Unfunded Non-Qualified Supplemental Pension Plan        
Defined Benefit Plan Disclosure [Line Items]        
Projected benefit obligation to unfunded plan   $ 1,700 $ 2,100  
Pension Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Projected benefit obligation to unfunded plan   248,114 $ 316,169 $ 336,159
Defined Benefit Plan, Expected Amortization of Gain (Loss), Next Fiscal Year   $ 12,000    
Expected long-term return on plan assets   3.05% 5.00% 5.00%
Employer contributions $ 50,000 $ 50,184 $ 5,209  
Settlement Funding Gap $ 24,000      
Defined Benefit Plan Assumption Expected Long Term Return On Assets At Year End   4.99% 3.05% 5.00%
Other Post-Retirement Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Projected benefit obligation to unfunded plan   $ 5,726 $ 7,370 $ 8,164
Defined Benefit Plan, Expected Amortization of Gain (Loss), Next Fiscal Year   200    
Employer contributions   $ 476 $ 463