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Retirement Plans And Other Postretirement Benefits (Reconciliation Of Changes In Benefit Obligations And Plan Assets) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan Assumption Expected Long Term Return On Assets At Year End 5.00%    
Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan Assumption Expected Long Term Return On Assets At Year End 5.00% 5.00% 6.00%
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Benefit obligation, beginning of year $ 318,763 $ 287,240  
Service cost 0 0 $ 17
Interest cost 10,156 12,222 11,442
Effect of actuarial (gains) losses related to the following:      
Discount rate change 26,887 38,919  
Retirement rate assumptions and mortality table adjustments (3,446) (2,589)  
Other 69 (1,047)  
Plan participant contributions 0 0  
Benefits paid 16,270 15,982  
Benefit obligation, end of year 336,159 318,763 287,240
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Plan assets at fair value, beginning of year 218,329 205,367  
Actual return on plan assets 18,800 20,624  
Employer contributions 12,216 8,320  
Plan participant contributions 0 0  
Benefits paid 16,270 15,982  
Plan assets at fair value, end of year 233,075 218,329 205,367
Funded status of the plans (103,084) (100,434)  
Amounts recognized in the consolidated balance sheets:      
Net amount recognized 103,084 100,434  
Plan participant contributions 0 0  
Plan participant contributions 0 0  
Benefits paid 16,270 15,982  
Benefits paid 16,270 15,982  
Other Post-Retirement Benefits      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Benefit obligation, beginning of year 7,650 6,889  
Service cost 29 26 36
Interest cost 243 290 271
Effect of actuarial (gains) losses related to the following:      
Discount rate change 644 894  
Retirement rate assumptions and mortality table adjustments 13 21  
Other 55 (176)  
Plan participant contributions 606 649  
Benefits paid 1,076 943  
Benefit obligation, end of year 8,164 7,650 6,889
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Plan assets at fair value, beginning of year 0 0  
Actual return on plan assets 0 0  
Employer contributions 470 294  
Plan participant contributions 606 649  
Benefits paid 1,076 943  
Plan assets at fair value, end of year 0 0 $ 0
Funded status of the plans (8,164) (7,650)  
Amounts recognized in the consolidated balance sheets:      
Net amount recognized 8,164 7,650  
Plan participant contributions 606 649  
Plan participant contributions 606 649  
Benefits paid 1,076 943  
Benefits paid 1,076 943  
Accrued Expenses | Pension Benefits      
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Liability, Defined Benefit Plan, Current 181 168  
Accrued Expenses | Other Post-Retirement Benefits      
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Liability, Defined Benefit Plan, Current 481 470  
Amounts recognized in the consolidated balance sheets:      
Liability, Defined Benefit Plan, Noncurrent 7,683 7,180  
Other Noncurrent Liabilities [Member] | Pension Benefits      
Amounts recognized in the consolidated balance sheets:      
Liability, Defined Benefit Plan, Noncurrent $ 102,903 $ 100,266