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Earnings Per Share and Capital Structure Earnings Per Share and Capital Structure (Tables)
 6 Months Ended
Jun. 30, 2015
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 June 30,
 
Six Months Ended June 30,
 
2015
 
2014
 
2015
 
2014
 
(in thousands, except per share data)
Net income (loss) available to common shareholders
$
(14,198
)
 
$
19,259

 
$
(9,288
)
 
$
19,005

 
 
 
 
 
 
 
 
Weighted average common shares outstanding - Basic
38,434

 
39,356

 
38,438

 
39,296

Dilutive effect of stock-based awards
—

 
188

 
—

 
232

Weighted average common shares outstanding - Diluted
38,434

 
39,544

 
38,438

 
39,528

Earnings (loss) per common share - Basic
$
(0.37
)
 
$
0.49

 
$
(0.24
)
 
$
0.48

Earnings (loss) per common share - Diluted
$
(0.37
)
 
$
0.49

 
$
(0.24
)
 
$
0.48