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Employee Benefit Plans And Other Postretirement Benefits (Components Of Net Periodic Benefit Cost) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Net Pension Costs [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Service cost for benefits earned during the year $ 19,808 $ 18,315 $ 17,955
Interest cost on accumulated benefit obligation 13,473 12,091 10,208
Expected return on assets (13,544) (11,207) (8,573)
Net amortization of unrecognized amounts, Prior service cost 5,782 5,685 4,903
Net amortization of unrecognized amounts, Actuarial loss 411 247 803
Other       (126)
Net periodic benefit cost 25,930 25,131 25,170
Net Postretirement Costs [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Service cost for benefits earned during the year 1,599 1,399 1,341
Interest cost on accumulated benefit obligation 1,189 1,130 1,022
Expected return on assets         
Net amortization of unrecognized amounts, Prior service cost (416) (416) (416)
Net amortization of unrecognized amounts, Actuarial loss 449 342 328
Other         
Net periodic benefit cost $ 2,821 $ 2,455 $ 2,275