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Earnings Per Share and Capital Structure Earnings Per Share and Capital Structure (Tables)
 9 Months Ended
Sep. 30, 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 per share (EPS):

 
Three Months Ended
September 30,
 
Nine Months Ended
September 30,
 
2012
 
2011
 
2012
 
2011
 
(in thousands, except per share data)
Net income (loss) available to common shareholders
$
35,347

 
$
(517,082
)
 
$
92,315

 
$
(455,526
)
 
 
 
 
 
 
 
 
Weighted average common shares outstanding - Basic
39,472

 
40,725

 
39,756

 
40,648

Dilutive effect of stock-based awards
319

 
—

 
286

 
—

Weighted average common shares outstanding - Diluted
39,791

 
40,725

 
40,042

 
40,648

Earnings per common share - Basic
$
0.90

 
$
(12.70
)
 
$
2.32

 
$
(11.21
)
Earnings per common share - Diluted
$
0.89

 
$
(12.70
)
 
$
2.31

 
$
(11.21
)