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Earnings Per Share Earnings Per Share (Tables)
 12 Months Ended
Dec. 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 (loss) per share (EPS):

 
Year Ended December 31,
 
2016
 
2015
 
2014
 
(in thousands, except per share data)
Net income (loss) available to common shareholders
$
31,770

 
$
12,678

 
$
(23,670
)
 
 
 
 
 
 
Weighted average common shares outstanding - Basic
38,207

 
38,224

 
39,184

Dilutive effect of stock-based awards
436

 
282

 
—

Weighted average common shares outstanding - Diluted
38,643

 
38,506

 
39,184

Earnings (loss) per common share - Basic
$
0.83

 
$
0.33

 
$
(0.60
)
Earnings (loss) per common share - Diluted
$
0.82

 
$
0.33

 
$
(0.60
)