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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, 2017
Dec. 31, 2016
Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan Assumption Expected Long Term Return On Assets At Year End 6.50%    
Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan Assumption Expected Long Term Return On Assets At Year End 6.50% 6.50% 7.00%
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Benefit obligation, beginning of year $ 303,126 $ 303,852  
Service cost 194 231 $ 530
Interest cost 12,575 13,323 13,217
Effect of actuarial (gains) losses related to the following:      
Discount rate change 21,055 9,296  
Retirement rate assumptions and mortality table adjustments (2,145) (5,537)  
Other (1,921) (3,025)  
Benefits paid 14,761 15,014  
Benefit obligation, end of year 318,123 303,126 303,852
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Plan assets at fair value, beginning of year 214,559 210,642  
Actual return on plan assets 21,034 11,199  
Employer contributions 5,522 7,732  
Benefits paid 14,761 15,014  
Plan assets at fair value, end of year 226,354 214,559 210,642
Funded status of the plans (91,769) (88,567)  
Amounts recognized in the consolidated balance sheets:      
Net amount recognized 91,769 88,567  
Benefits paid 14,761 15,014  
Benefits paid 14,761 15,014  
Other Post-Retirement Benefits      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Benefit obligation, beginning of year 7,436 7,745  
Service cost 33 38 44
Interest cost 301 337 325
Effect of actuarial (gains) losses related to the following:      
Discount rate change 471 210  
Retirement rate assumptions and mortality table adjustments 15 (433)  
Other (245) (131)  
Plan participant contributions 646 634  
Benefits paid 953 964  
Benefit obligation, end of year 7,704 7,436 7,745
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 307 330  
Plan participant contributions 646 634  
Benefits paid 953 964  
Plan assets at fair value, end of year 0 0 $ 0
Funded status of the plans (7,704) (7,436)  
Amounts recognized in the consolidated balance sheets:      
Net amount recognized 7,704 7,436  
Plan participant contributions 646 634  
Plan participant contributions 646 634  
Benefits paid 953 964  
Benefits paid 953 964  
Accrued Expenses | Pension Benefits      
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Liability, Defined Benefit Plan, Current 182 182  
Accrued Expenses | Other Post-Retirement Benefits      
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Liability, Defined Benefit Plan, Current 457 453  
Amounts recognized in the consolidated balance sheets:      
Liability, Defined Benefit Plan, Noncurrent 7,247 6,983  
Other Noncurrent Liabilities [Member] | Pension Benefits      
Amounts recognized in the consolidated balance sheets:      
Liability, Defined Benefit Plan, Noncurrent $ 91,587 $ 88,385