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Earnings Per Share
 12 Months Ended
Dec. 31, 2012
Earnings Per Share [Abstract]  
Earnings Per Share [Text Block]
3. EARNINGS PER SHARE
Basic earnings per share are computed using net income and the weighted average number of common shares outstanding for each period presented. Diluted earnings per share are computed in the same manner, except it uses the weighted average number of common shares outstanding plus the effects of the assumed exercise of stock options and the payment of estimated stock awards from other stock-based compensation plans that are outstanding at the end of each period presented. Diluted earnings per share are calculated as follows:
In thousands, except per share data
 
2012
 
2011
 
2010
Net income
 
$
59,855

 
$
63,898

 
$
72,667

Average common shares outstanding - basic
 
26,831

 
26,687

 
26,589

Additional shares for stock-based compensation plans (See Note 6)
 
76

 
57

 
68

Average common shares outstanding - diluted
 
26,907

 
26,744

 
26,657

Earnings per share of common stock - basic
 
$
2.23

 
$
2.39

 
$
2.73

Earnings per share of common stock - diluted
 
$
2.22

 
$
2.39

 
$
2.73

Additional information:
 
 
 
 
 
 
Antidilutive shares not included in net income per diluted common share calculation
 
1

 
2

 
1