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Earnings Per Share (Tables)
 3 Months Ended
Mar. 31, 2017
Earnings Per Share [Abstract]  
Computation of Basic and Diluted Earnings Per Share [Table Text Block]
The following table sets forth the computation of basic and diluted earnings per share (EPS):

 
Three Months Ended March 31,
 
2017
 
2016
 
(in thousands, except per share data)
Net income available to common shareholders
$
15,845

 
$
10,089

 
 
 
 
Weighted average common shares outstanding - Basic
38,474

 
38,059

Dilutive effect of stock-based awards
741

 
317

Weighted average common shares outstanding - Diluted
39,215

 
38,376

Earnings per common share - Basic
$
0.41

 
$
0.27

Earnings per common share - Diluted
$
0.40

 
$
0.26