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Earnings per common share
6 Months Ended
Jun. 30, 2013
Earnings Per Share [Abstract]  
Earnings per common share
Earnings per common share
Basic earnings per common share were computed by dividing earnings on common stock by the weighted average number of shares of common stock outstanding during the applicable period. Diluted earnings per common share were computed by dividing earnings on common stock by the total of the weighted average number of shares of common stock outstanding during the applicable period, plus the effect of outstanding performance share awards. Common stock outstanding includes issued shares less shares held in treasury. Net income was the same for both the basic and diluted earnings per share calculations. A reconciliation of the weighted average common shares outstanding used in the basic and diluted earnings per share calculation was as follows:
 
Three Months Ended
Six Months Ended
 
June 30,
June 30,
 
2013

2012

2013

2012

 
(In thousands)
 
 
Weighted average common shares outstanding - basic
188,831

188,831

188,831

188,821

Effect of dilutive stock options and performance share awards
632

276

629

275

Weighted average common shares outstanding - diluted
189,463

189,107

189,460

189,096

Shares excluded from the calculation of diluted earnings per share