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Employee Benefit Plans And Other Postretirement Benefits (Schedule Of Pension And Postretirement Benefit Plans) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets at plan year end $ 185,122 $ 167,033  
Net Pension Costs [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Benefit obligation at beginning of period 246,985 203,292 178,455
Service cost 19,808 18,315 17,955
Interest cost 13,473 12,091 10,208
Plan amendments 1,827 837 7,168
Actuarial loss 35,399 15,153 701
Participant contributions        
Benefits paid (3,337) (2,703) (11,195)
Benefit obligation at plan year end 314,155 246,985 203,292
Accumulated benefit obligation portion of above 280,820 214,676 171,384
Plan assets at fair value at beginning of period 167,033 140,065 97,248
Actual return on plan assets (732) 14,457 18,590
Company contributions 22,158 15,214 35,422
Fair value of plan assets at plan year end 185,122 167,033 140,065
Net Postretirement Costs [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Benefit obligation at beginning of period 23,215 20,080 17,300
Service cost 1,599 1,399 1,341
Interest cost 1,189 1,130 1,022
Plan amendments        
Actuarial loss 755 1,931 987
Participant contributions 942 838 656
Benefits paid (1,763) (2,163) (1,226)
Benefit obligation at plan year end 25,937 23,215 20,080
Accumulated benefit obligation portion of above        
Plan assets at fair value at beginning of period         
Actual return on plan assets        
Company contributions 821 1,325 570
Fair value of plan assets at plan year end