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Earnings Per Share (Tables)
6 Months Ended
Jun. 30, 2013
Earnings Per Share [Abstract]  
Schedule of Weighted-Average Number of Shares Outstanding
The following is a calculation of the basic and diluted weighted-average shares outstanding for the three and six months ended June 30, 2013 and 2012: 
 
Three Months Ended 
 June 30,
 
Six Months Ended June 30,
 
2013
 
2012
 
2013
 
2012
 
(In thousands)
Basic weighted average common shares outstanding
92,399

 
92,176

 
92,387

 
92,153

Dilution effect of stock awards at end of period
303

 
46

 
425

 
186

Diluted weighted average common shares outstanding
92,702

 
92,222

 
92,812

 
92,339

Anti-dilutive stock-based compensation awards
914

 
634

 
711

 
397