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Earnings Per Share and Capital Structure Earnings Per Share and Capital Structure (Tables)
 6 Months Ended
Jun. 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 June 30,
 
Six Months Ended June 30,
 
2013
 
2012
 
2013
 
2012
 
(in thousands, except per share data)
Net income available to common shareholders
$
12,399

 
$
31,615

 
$
14,969

 
$
56,968

 
 
 
 
 
 
 
 
Weighted average common shares outstanding - Basic
39,431

 
39,887

 
39,426

 
39,900

Dilutive effect of stock-based awards
247

 
239

 
298

 
270

Weighted average common shares outstanding - Diluted
39,678

 
40,126

 
39,724

 
40,170

Earnings per common share - Basic
$
0.31

 
$
0.79

 
$
0.38

 
$
1.43

Earnings per common share - Diluted
$
0.31

 
$
0.79

 
$
0.38

 
$
1.42