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Retirement Plans And Other Postretirement Benefits (Reconciliation Of Changes In Benefit Obligations And Plan Assets) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value, end of year $ 209,682 $ 205,401  
Prepaid benefit cost 219,035 214,647  
Pension Benefits [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Benefit obligation, beginning of year 272,436 247,969  
Service cost 3,657 3,361 3,315
Interest cost 13,084 13,024 13,071
Discount rate change 26,843 16,986  
Retirement rate assumptions and mortality table adjustments   6,314  
Other (1,372) (3,399)  
Benefits paid (12,363) (11,819)  
Benefit obligation, end of year 302,285 272,436 247,969
Plan assets at fair value, beginning of year 214,647 239,706  
Actual return on plan assets 14,455 (13,413)  
Employer contributions 2,296 173  
Plan assets at fair value, end of year 219,035 214,647 239,706
Funded status of the plans (83,250) (57,789)  
Prepaid benefit cost        
Accrued benefit liability (83,250) (57,789)  
Net amount recognized (83,250) (57,789)  
Other Post-Retirement Benefits [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Benefit obligation, beginning of year 8,422 7,350  
Service cost 58 54 76
Interest cost 385 395 467
Discount rate change 549 414  
Retirement rate assumptions and mortality table adjustments   (52)  
Retiree medical participation rate change   449  
Other (243) 122  
Benefits paid (292) (310)  
Benefit obligation, end of year 8,879 8,422 7,350
Employer contributions 292 310  
Funded status of the plans (8,879) (8,422)  
Prepaid benefit cost        
Accrued benefit liability (8,879) (8,422)  
Net amount recognized $ (8,879) $ (8,422)