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Employee Benefit Plans (Schedule Of Net Benefit Costs) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Pension Benefits [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Service cost $ 16,490 $ 15,870 $ 13,444
Interest cost 16,253 15,822 15,946
Expected return on plan assets (21,812) [1] (19,392) [1] (17,719) [1]
Amortization of prior service cost (credit) (189) 173 193
Amortization of other actuarial (gains) losses 8,748 7,130 3,967
Curtailments     585
Net benefit cost 19,490 19,603 16,416
Other Postretirement Benefits [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Service cost 3,917 1,509 2,954
Interest cost 3,279 2,083 3,667
Expected return on plan assets    [1]    [1]    [1]
Amortization of prior service cost (credit) (2,364) (2,364) 2,161
Amortization of other actuarial (gains) losses (3,100) (2,918) (2,897)
Net benefit cost $ 1,732 $ (1,690) $ 5,885
[1] The Company does not fund its other postretirement benefit obligations.