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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, 2016
Dec. 31, 2015
Dec. 31, 2014
Pension Benefits      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Benefit obligation, beginning of year $ 303,852 $ 325,426  
Service cost 231 530 $ 869
Interest cost 13,323 13,217 13,397
Effect of actuarial (gains) losses related to the following:      
Discount rate change 9,296 (14,687)  
Retirement rate assumptions and mortality table adjustments (5,537) (5,456)  
Other (3,025) (746)  
Benefits paid (15,014) (14,432)  
Benefit obligation, end of year 303,126 303,852 325,426
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Plan assets at fair value, beginning of year 210,642 229,017  
Actual return on plan assets 11,199 (6,311)  
Employer contributions 7,732 2,368  
Benefits paid (15,014) (14,432)  
Plan assets at fair value, end of year 214,559 210,642 229,017
Funded status of the plans (88,567) (93,210)  
Amounts recognized in the consolidated balance sheets:      
Net amount recognized 88,567 93,210  
Other Post-Retirement Benefits      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Benefit obligation, beginning of year 7,745 8,372  
Service cost 38 44 43
Interest cost 337 325 387
Effect of actuarial (gains) losses related to the following:      
Discount rate change 210 (356)  
Retirement rate assumptions and mortality table adjustments (433) 32  
Other (131) (332)  
Benefits paid (964) (965)  
Benefit obligation, end of year 7,436 7,745 8,372
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 330 340  
Benefits paid (964) (965)  
Plan assets at fair value, end of year 0 0 $ 0
Funded status of the plans (7,436) (7,745)  
Amounts recognized in the consolidated balance sheets:      
Net amount recognized 7,436 7,745  
Defined Benefit Plan, Contributions by Plan Participants 634 625  
Accrued Expenses | Pension Benefits      
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Pension and Other Postretirement Defined Benefit Plans, Current Liabilities 182 210  
Accrued Expenses | Other Post-Retirement Benefits      
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Pension and Other Postretirement Defined Benefit Plans, Current Liabilities 453 455  
Amounts recognized in the consolidated balance sheets:      
Pension and Other Postretirement Defined Benefit Plans, Liabilities, Noncurrent 6,983 7,290  
Other Noncurrent Liabilities [Member] | Pension Benefits      
Amounts recognized in the consolidated balance sheets:      
Pension and Other Postretirement Defined Benefit Plans, Liabilities, Noncurrent $ 88,385 $ 93,000