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Earnings Per Share and Capital Structure Earnings Per Share and Capital Structure (Tables)
 3 Months Ended
Mar. 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 per share (EPS):

 
Three Months Ended
March 31,
 
2012
 
2011
 
(in thousands, except per share data)
Net income available to common shareholders
$
25,353

 
$
27,120

 
 
 
 
Weighted average common shares outstanding - Basic
39,913

 
40,546

Dilutive effect of convertible notes
—

 
—

Dilutive effect of stock-based awards
303

 
499

Weighted average common shares outstanding - Diluted
40,216

 
41,045

Earnings per common share - Basic
$
0.64

 
$
0.67

Earnings per common share - Diluted
$
0.63

 
$
0.66