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Earnings Per Share and Capital Structure Earnings Per Share and Capital Structure (Tables)
 3 Months Ended
Mar. 31, 2016
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,
 
2016
 
2015
 
(in thousands, except per share data)
Net income available to common shareholders
$
10,089

 
$
5,398

 
 
 
 
Weighted average common shares outstanding - Basic
38,059

 
38,442

Dilutive effect of stock-based awards
317

 
316

Weighted average common shares outstanding - Diluted
38,376

 
38,758

Earnings per common share - Basic
$
0.27

 
$
0.14

Earnings per common share - Diluted
$
0.26

 
$
0.14