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Employee Benefit Plans And Other Postretirement Benefits (Components Of Net Pension Costs) (Details) (Net Pension Costs [Member], USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Net Pension Costs [Member]
    
Defined Benefit Plan Disclosure [Line Items]    
Service cost for benefits earned during the year $ 5,606 $ 4,952
Interest cost on accumulated benefit obligation 3,700 3,368
Expected return on assets (3,027) (3,385)
Net amortization of unrecognized amounts, Prior service cost 1,498 1,445
Net amortization of unrecognized amounts, Actuarial loss 1,229 103
Net periodic benefit cost $ 9,006 $ 6,483