Employee Benefit Plans (Summary of Estimated Future Benefit Payments) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013
Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Expected Future Benefit Payments, Next Twelve Months	$ 21,844
Defined Benefit Plan, Expected Future Benefit Payments, Rolling Year Two	21,666
Defined Benefit Plan, Expected Future Benefit Payments, Year Three	27,689
Defined Benefit Plan, Expected Future Benefit Payments, Year Four	29,999
Defined Benefit Plan, Expected Future Benefit Payments, Year Five	33,488
Defined Benefit Plan, Expected Future Benefit Payments, Five Fiscal Years Thereafter	190,030
DefinedBenefitPlanExpectedFutureBenefitPaymentsTotal	324,716
Other Postretirement Benefit Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Expected Future Benefit Payments, Next Twelve Months	4,020
Defined Benefit Plan, Expected Future Benefit Payments, Rolling Year Two	4,226
Defined Benefit Plan, Expected Future Benefit Payments, Year Three	4,415
Defined Benefit Plan, Expected Future Benefit Payments, Year Four	4,523
Defined Benefit Plan, Expected Future Benefit Payments, Year Five	4,602
Defined Benefit Plan, Expected Future Benefit Payments, Five Fiscal Years Thereafter	22,028
DefinedBenefitPlanExpectedFutureBenefitPaymentsTotal	$ 43,814