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Long Term Asset Allocation Ranges (Details)
 12 Months Ended
Dec. 31, 2013
Domestic equities
  
Defined Benefit Plan Disclosure [Line Items]  
Defined benefit plan, long-term assets, minimum 10.00%
Defined benefit plan, long-term assets, maximum 32.00%
International equities, including emerging markets
  
Defined Benefit Plan Disclosure [Line Items]  
Defined benefit plan, long-term assets, minimum 10.00%
Defined benefit plan, long-term assets, maximum 32.00%
Corporate bonds
  
Defined Benefit Plan Disclosure [Line Items]  
Defined benefit plan, long-term assets, minimum 38.00%
Defined benefit plan, long-term assets, maximum 80.00%
Liquid reserves
  
Defined Benefit Plan Disclosure [Line Items]  
Defined benefit plan, long-term assets, minimum 0.00%
Defined benefit plan, long-term assets, maximum 1.00%