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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, 2019
Dec. 31, 2018
Dec. 31, 2017
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% 6.00% 6.50%
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Benefit obligation, beginning of year $ 287,240 $ 318,123  
Service cost 0 17 $ 194
Interest cost 12,222 11,442 12,575
Effect of actuarial (gains) losses related to the following:      
Discount rate change 38,919 (23,653)  
Retirement rate assumptions and mortality table adjustments (2,589) (914)  
Other (1,047) (2,326)  
Benefits paid 15,982 15,449  
Benefit obligation, end of year 318,763 287,240 318,123
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Plan assets at fair value, beginning of year 205,367 226,354  
Actual return on plan assets 20,624 (14,148)  
Employer contributions 8,320 8,610  
Benefits paid 15,982 15,449  
Plan assets at fair value, end of year 218,329 205,367 226,354
Funded status of the plans (100,434) (81,873)  
Amounts recognized in the consolidated balance sheets:      
Net amount recognized 100,434 81,873  
Benefits paid 15,982 15,449  
Benefits paid 15,982 15,449  
Other Post-Retirement Benefits      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Benefit obligation, beginning of year 6,889 7,704  
Service cost 26 36 33
Interest cost 290 271 301
Effect of actuarial (gains) losses related to the following:      
Discount rate change 894 (546)  
Retirement rate assumptions and mortality table adjustments 21 6  
Other (176) (285)  
Plan participant contributions 649 656  
Benefits paid 943 953  
Benefit obligation, end of year 7,650 6,889 7,704
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 294 297  
Plan participant contributions 649 656  
Benefits paid 943 953  
Plan assets at fair value, end of year 0 0 $ 0
Funded status of the plans (7,650) (6,889)  
Amounts recognized in the consolidated balance sheets:      
Net amount recognized 7,650 6,889  
Plan participant contributions 649 656  
Plan participant contributions 649 656  
Benefits paid 943 953  
Benefits paid 943 953  
Accrued Expenses | Pension Benefits      
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Liability, Defined Benefit Plan, Current 168 182  
Accrued Expenses | Other Post-Retirement Benefits      
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Liability, Defined Benefit Plan, Current 470 456  
Amounts recognized in the consolidated balance sheets:      
Liability, Defined Benefit Plan, Noncurrent 7,180 6,433  
Other Noncurrent Liabilities [Member] | Pension Benefits      
Amounts recognized in the consolidated balance sheets:      
Liability, Defined Benefit Plan, Noncurrent $ 100,266 $ 81,691