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Employee Benefit Plans Employee Benefit Plans (Summary Of Estimated Future Benefit Payments) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Pension Benefits [Member]
 
Defined Benefit Plan Disclosure [Line Items]  
Defined Benefit Plan, Expected Future Benefit Payments, Next Twelve Months $ 21,275
Defined Benefit Plan, Expected Future Benefit Payments, Rolling Year Two 23,674
Defined Benefit Plan, Expected Future Benefit Payments, Year Three 24,210
Defined Benefit Plan, Expected Future Benefit Payments, Year Four 28,464
Defined Benefit Plan, Expected Future Benefit Payments, Year Five 32,124
Defined Benefit Plan, Expected Future Benefit Payments, Five Fiscal Years Thereafter 190,016
DefinedBenefitPlanExpectedFutureBenefitPaymentsTotal 319,763
Other Postretirement Benefit Plans, Defined Benefit [Member]
 
Defined Benefit Plan Disclosure [Line Items]  
Defined Benefit Plan, Expected Future Benefit Payments, Next Twelve Months 3,987
Defined Benefit Plan, Expected Future Benefit Payments, Rolling Year Two 4,204
Defined Benefit Plan, Expected Future Benefit Payments, Year Three 4,430
Defined Benefit Plan, Expected Future Benefit Payments, Year Four 4,720
Defined Benefit Plan, Expected Future Benefit Payments, Year Five 4,893
Defined Benefit Plan, Expected Future Benefit Payments, Five Fiscal Years Thereafter 24,895
DefinedBenefitPlanExpectedFutureBenefitPaymentsTotal $ 47,129