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 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Net Income Per Share [Abstract]        
Dilutive effect of outstanding stock options and shares associated with long-term incentive compensation plans 39,841 77,263 28,008 55,741
Deferred stock awards excluded from calculation of earnings per share     148,748