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Earnings Per Share and Capital Structure Earnings Per Share and Capital Structure (Tables)
 12 Months Ended
Dec. 31, 2014
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,
 
2014
 
2013
 
2012
 
(in thousands, except per share data)
Net income (loss) available to common shareholders
$
(22,920
)
 
$
(146,809
)
 
$
108,275

 
 
 
 
 
 
Weighted average common shares outstanding - Basic
39,184

 
39,281

 
39,625

Dilutive effect of stock-based awards
—

 
—

 
309

Weighted average common shares outstanding - Diluted
39,184

 
39,281

 
39,934

Earnings (loss) per common share - Basic
$
(0.58
)
 
$
(3.74
)
 
$
2.73

Earnings (loss) per common share - Diluted
$
(0.58
)
 
$
(3.74
)
 
$
2.71