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Retirement Plans (Weighted-Average Expense Assumptions) (Details)
9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Retirement Income Plan [Member]
   
Defined Benefit Plan Disclosure [Line Items]    
Discount rate 5.16% 5.55%
Expected return on plan assets 7.75% 8.00%
Rate of compensation increase 4.00% 4.00%
Retirement Life Plan [Member]
   
Defined Benefit Plan Disclosure [Line Items]    
Discount rate 5.16% 5.55%
Expected return on plan assets 0.00% 0.00%
Rate of compensation increase 0.00% 0.00%