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Earnings Per Share and Capital Structure Earnings Per Share and Capital Structure (Tables)
 6 Months Ended
Jun. 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 June 30,
 
Six Months Ended June 30,
 
2012
 
2011
 
2012
 
2011
 
(in thousands, except per share data)
Net income available to common shareholders
$
31,615

 
$
34,436

 
$
56,968

 
$
61,556

 
 
 
 
 
 
 
 
Weighted average common shares outstanding - Basic
39,887

 
40,670

 
39,900

 
40,608

Dilutive effect of convertible notes
—

 
—

 
—

 
—

Dilutive effect of stock-based awards
239

 
407

 
270

 
451

Weighted average common shares outstanding - Diluted
40,126

 
41,077

 
40,170

 
41,059

Earnings per common share - Basic
$
0.79

 
$
0.85

 
$
1.43

 
$
1.52

Earnings per common share - Diluted
$
0.79

 
$
0.84

 
$
1.42

 
$
1.50