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Employee Stock and Incentive Plans - Stock Options, Range of Exercise Price (Details) (USD $)
12 Months Ended
Dec. 31, 2013
$37.76 to $41.35 [Member]
 
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise Price Range, Lower Range Limit $ 37.76
Exercise Price Range, Upper Range Limit $ 41.35
Number Outstanding 44,263
Weighted Average Remaining Contractual Term (in Years) 2 years 7 months 23 days
Weighted Average Exercise Price $ 40.18
Number Exercisable 44,263
Weighted Average Remaining Contractual Term (in Years) 2 years 7 months 23 days
Weighted Average Exercise Price $ 40.18
$44.15 to $48.65 [Member]
 
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise Price Range, Lower Range Limit $ 44.15
Exercise Price Range, Upper Range Limit $ 48.65
Number Outstanding 64,036
Weighted Average Remaining Contractual Term (in Years) 2 years 8 months 5 days
Weighted Average Exercise Price $ 46.81
Number Exercisable 64,036
Weighted Average Remaining Contractual Term (in Years) 2 years 8 months 5 days
Weighted Average Exercise Price $ 46.81