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Earnings Per Share and Capital Structure Earnings Per Share and Capital Structure (Tables)
 9 Months Ended
Sep. 30, 2013
Earnings Per Share and Capital Structure [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
September 30,
 
Nine Months Ended
September 30,
 
2013
 
2012
 
2013
 
2012
 
(in thousands, except per share data)
Net income (loss) available to common shareholders
$
(7,348
)
 
$
35,347

 
$
7,621

 
$
92,315

 
 
 
 
 
 
 
 
Weighted average common shares outstanding - Basic
39,127

 
39,472

 
39,325

 
39,756

Dilutive effect of stock-based awards
—

 
319

 
298

 
286

Weighted average common shares outstanding - Diluted
39,127

 
39,791

 
39,623

 
40,042

Earnings (loss) per common share - Basic
$
(0.19
)
 
$
0.90

 
$
0.19

 
$
2.32

Earnings (loss) per common share - Diluted
$
(0.19
)
 
$
0.89

 
$
0.19

 
$
2.31