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Earnings Per Share (Tables)
6 Months Ended
Jun. 30, 2015
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
The reconciliations of the denominators of the basic and diluted earnings per share computations are as follows (in thousands):
 
Three Months Ended
June 30,
 
Six Months Ended
June 30,
 
2015
 
2014
 
2015
 
2014
Weighted-average common shares
outstanding—basic
80,745

 
78,183

 
79,515

 
78,154

Dilutive effect of potential common shares

 
1,868

 

 
1,588

Weighted-average common shares
outstanding—diluted
80,745

 
80,051

 
79,515

 
79,742