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Earnings Per Share and Capital Structure Earnings Per Share and Capital Structure (Tables)
 12 Months Ended
Dec. 31, 2012
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 (loss) per share (EPS):

 
Year Ended December 31,
 
2012
 
2011
 
2010
 
(in thousands, except per share data)
Net income (loss) available to common shareholders
$
108,275

 
$
(510,157
)
 
$
104,770

 
 
 
 
 
 
Weighted average common shares outstanding - Basic
39,625

 
40,612

 
40,337

Dilutive effect of convertible notes
—

 
—

 
103

Dilutive effect of stock-based awards
309

 
—

 
507

Weighted average common shares outstanding - Diluted
39,934

 
40,612

 
40,947

Earnings (loss) per common share - Basic
$
2.73

 
$
(12.56
)
 
$
2.60

Earnings (loss) per common share - Diluted
$
2.71

 
$
(12.56
)
 
$
2.56