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Net Income per Share
 3 Months Ended
Mar. 31, 2012
Earnings Per Share [Abstract]  
Net Income per Share
Net Income per Share
Net income per share was determined by dividing net income to shareholders by the applicable weighted average shares outstanding. 
 
Three Months Ended
March 31,
(in thousands, except per share amounts)
2012
 
2011
Net income to shareholders
$
57,253

 
$
8,272

Basic common shares outstanding
9,642

 
9,717

Dilutive potential common shares
29

 
40

Diluted shares outstanding
9,671

 
9,757

Basic net income per share
$
5.94

 
$
0.85

Diluted net income per share
$
5.92

 
$
0.85