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Pension and Other Postretirement Benefits Expected Contribution Cash Flows (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Pension Plans, Defined Benefit [Member]
  
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
Defined Benefit Plan, Estimated Future Employer Contributions in Next Fiscal Year $ 10,094
Defined Benefit Plan, Expected Future Benefit Payments, Next Twelve Months 12,913
Defined Benefit Plan, Expected Future Benefit Payments, Year Two 13,185
Defined Benefit Plan, Expected Future Benefit Payments, Year Three 13,440
Defined Benefit Plan, Expected Future Benefit Payments, Year Four 13,849
Defined Benefit Plan, Expected Future Benefit Payments, Year Five 14,317
Defined Benefit Plan, Expected Future Benefit Payments, Five Fiscal Years Thereafter 77,708
Other Postretirement Benefit Plans, Defined Benefit [Member]
  
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
Defined Benefit Plan, Estimated Future Employer Contributions in Next Fiscal Year 5,370
Defined Benefit Plan, Expected Future Benefit Payments, Next Twelve Months 5,370
Defined Benefit Plan, Expected Future Benefit Payments, Year Two 5,978
Defined Benefit Plan, Expected Future Benefit Payments, Year Three 6,641
Defined Benefit Plan, Expected Future Benefit Payments, Year Four 7,174
Defined Benefit Plan, Expected Future Benefit Payments, Year Five 7,784
Defined Benefit Plan, Expected Future Benefit Payments, Five Fiscal Years Thereafter $ 44,393