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Retirement Plans And Other Postretirement Benefits (Narrative) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]      
Pension and other postretirement liabilities $ 78,265 $ 110,585  
Percentage of change in health care cost trend rate assumptions would be immaterial 1.00%    
Expected pension expense for next twelve months $ 13,900    
Defined benefit, average remaining duration of benefit payments for pension plans 11 years 1 month 6 days    
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage 100.00% 100.00% 100.00%
Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Projected benefit obligation to unfunded plan $ 316,169 $ 336,159 $ 318,763
Multi-employer pension plan, pension expenses 14,085 14,646 $ 9,585
Defined Benefit Plan, Expected Amortization of Gain (Loss), Next Fiscal Year (13,200)    
Defined Benefit Plan, Expected Amortization of Gain (Loss), Next Fiscal Year 13,200    
Unfunded Non-Qualified Supplemental Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Projected benefit obligation to unfunded plan 2,100 $ 2,200  
Pension Cost (Reversal of Cost) $ 100