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Earnings Per Share
 6 Months Ended
Jun. 30, 2012
Earnings Per Share [Abstract]  
Earnings Per Share
Earnings Per Share
Basic net income per share has been computed by dividing net income by the weighted average number of shares of common stock outstanding. Diluted net income per share has been computed by dividing net income by the weighted average number of shares of common stock outstanding plus other potentially dilutive securities. The following table sets forth the calculations of basic and diluted net income per share (dollars in thousands, except share data): 
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2012
 
2011
 
2012
 
2011
Basic net income per share:
 
 
 
 
 
 
 
Net income
$
32,024

 
$
44,294

 
$
65,110

 
$
114,771

Weighted average number of common shares outstanding
47,312,154

 
48,419,556

 
47,186,248

 
48,342,756

Basic net income per share
$
0.68

 
$
0.91

 
$
1.38

 
$
2.37

Diluted net income per share:
 
 
 
 
 
 
 
Net income
$
32,024

 
$
44,294

 
$
65,110

 
$
114,771

Weighted average number of common shares outstanding
47,312,154

 
48,419,556

 
47,186,248

 
48,342,756

Dilutive effect of stock options and non-vested stock awards
1,245,492

 
1,764,664

 
1,329,421

 
1,813,532

Dilutive effect of assumed conversion of the 2.0% Convertible Senior Notes
967,141

 
2,196,048

 
1,578,640

 
1,818,377

Dilutive effect of warrants
914,700

 
1,161,100

 
1,076,618

 
683,638

Weighted average number of common shares and dilutive potential common shares outstanding
50,439,487

 
53,541,368

 
51,170,927

 
52,658,303

Diluted net income per share
$
0.63

 
$
0.83

 
$
1.27

 
$
2.18


Potential common stock equivalents representing 86,760 shares and 59,554 shares for the three and six months ended June 30, 2012, respectively, were not included in the computation of diluted net income per share because to do so would have been anti-dilutive. Potential common stock equivalents representing 4,835 shares and 2,431 shares for the three and six months ended June 30, 2011, respectively, were not included in the computation of diluted net income per share because to do so would have been anti-dilutive.