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Earnings Per Share Earnings Per Share (Tables)
 12 Months Ended
Dec. 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):

 
Year Ended December 31,
 
2017
 
2016
 
2015
 
(in thousands, except per share data)
Net income available to common shareholders
$
57,298

 
$
31,770

 
$
12,678

 
 
 
 
 
 
Weighted average common shares outstanding - Basic
38,655

 
38,207

 
38,224

Dilutive effect of stock-based awards
732

 
436

 
282

Weighted average common shares outstanding - Diluted
39,387

 
38,643

 
38,506

Earnings per common share - Basic
$
1.48

 
$
0.83

 
$
0.33

Earnings per common share - Diluted
$
1.45

 
$
0.82

 
$
0.33