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Pension Benefits (Narrative) (Details)
9 Months Ended
Sep. 30, 2013
Pension Benefits [Line Items]  
Noncontributory defined benefit pension plan, least work hours per year 1,000
Participants vested interest accrued benefit, service period, years 5 years
Benefits plan based on service and average annual earnings for highest consecutive calendar years 5 years
Benefits plan based on service and average annual earnings for highest consecutive calendar years from final employment period years 10 years
Maximum [Member]
 
Pension Benefits [Line Items]  
Plan assets, listed common stocks, percentage 10.00%