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Pension And Postretirement Benefits (Components Of Net Periodic Benefits Cost) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Pension Benefits [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Service cost $ 13,503 $ 11,710  
Interest cost 37,653 38,163  
Postretirement Benefits [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 107 121  
Interest cost 497 588  
Schedule Of Defined Net Periodic Benefit Cost [Member] | Pension Benefits [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 13,503 11,710 11,417
Interest cost 37,653 38,163 36,301
Expected return on plan assets (51,437) (50,620) (43,793)
Amortization of prior service cost 402 421 451
Amortization of net (gain) loss 19,403 6,733 6,985
Recognized Curtailments Gain/(Loss) 460    
Settlement costs (125) 0 2,614
Special termination benefits   0 52
Net periodic benefit cost 19,859 6,407 14,027
Schedule Of Defined Net Periodic Benefit Cost [Member] | Postretirement Benefits [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 108 121 114
Interest cost 498 588 745
Amortization of prior service cost (236) (236)  
Amortization of net (gain) loss (139) (110) (175)
Net periodic benefit cost $ 231 $ 363 $ 684