Quarterly report pursuant to Section 13 or 15(d)

Net Income Per Share (Details)

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Net Income Per Share (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Net Income Per Share [Line Items]        
Dilutive effect of outstanding stock options and shares associated with long-term incentive compensation plans 12,065 69,562 22,952 57,210
Employee Stock Option [Member]
       
Net Income Per Share [Line Items]        
Deferred stock awards excluded from calculation of earnings per share 80,290 0 80,290 0
Deferred Stock [Member]
       
Net Income Per Share [Line Items]        
Deferred stock awards excluded from calculation of earnings per share 150,748 78,943 150,748 78,943