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Earnings Per Share (Tables)
9 Months Ended
Sep. 30, 2014
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
September 30,
 
Nine Months Ended
September 30,
 
2014
 
2013
 
2014
 
2013
Weighted-average common shares outstanding—basic
78,203

 
77,637

 
78,170

 
76,401

Dilutive effect of potential common shares
2,022

 
693

 
1,807

 
302

Weighted-average common shares outstanding—diluted
80,225

 
78,330

 
79,977

 
76,703