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Net Income (Loss) Per Share (Tables)
 12 Months Ended
Dec. 31, 2012
Earnings Per Share [Abstract]  
Basic and Diluted Net Income (Loss) Per Share
The calculations of basic and diluted net income (loss) per share are as follows:
 
 
December 31,
 
 
2012
 
2011
 
2010
Net income (loss) - basic
 
$
750,269

 
$
(221,760
)
 
$
(104,468
)
Effect of dilutive securities:
 
 
 
 
 
 
Convertible senior notes - interest expense related to contractual coupon interest rate and amortization of discount and note issuance costs
 
29,126

 


 

Net income (loss) - diluted
 
$
779,395

 
$
(221,760
)
 
$
(104,468
)
 
 
 
 
 
 
 
(Shares in thousands)
 
 
 
 
 
 
Weighted average shares - basic
 
94,685

 
90,610

 
82,926

Effect of dilutive securities:
 
 
 
 
 
 
Stock options
 
14,231

 


 


Restricted stock
 
715

 


 


Convertible senior notes
 
4,761

 


 


Warrants
 
990

 


 


Dilutive potential shares
 
20,697

 


 

Weighted average shares - diluted
 
115,382

 
90,610

 
82,926

 
 
 
 
 
 
 
Net income (loss) per share - basic
 
$
7.92

 
$
(2.45
)
 
$
(1.26
)
Net income (loss) per share - diluted
 
$
6.75

 
$
(2.45
)
 
$
(1.26
)
Antidilutive Securities
Shares which have been excluded from the December 31, 2012, 2011, and 2010 diluted per share amounts because their effect would have been antidilutive, include the following:
 
 
December 31,
(Shares in thousands)
 
2012
 
2011
 
2010
Stock options
 
325

 
20,942

 
21,428

Restricted stock
 


 
846

 
526

Convertible senior notes
 


 
939

 


Warrants
 
3,771

 
939