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Unaudited Quarterly Results (Tables)
 12 Months Ended
Dec. 31, 2012
Quarterly Financial Information Disclosure [Abstract]  
Schedule of Quarterly Financial Information
Summarized quarterly financial data for the years ended December 31, 2012 and 2011 are set forth in the following tables.

 
 
First Quarter Ended
March 31, 2012
 
Second Quarter Ended
June 30, 2012
 
Third Quarter Ended
September 30, 2012
 
Fourth Quarter Ended
December 31, 2012
 
 
(Unaudited)
Revenues (1)
 
$
231,789

 
$
304,399

 
$
427,687

 
$
414,602

Net income (2)
 
11,651

 
76,743

 
191,468

 
470,407

Net income per share - basic
 
$
0.12

 
$
0.81

 
$
2.02

 
$
4.92

Net income per share - diluted
 
$
0.11

 
$
0.70

 
$
1.72

 
$
4.08

 
 
 
 
 
 
 
 
 
 
 
First Quarter Ended
March 31, 2011
 
Second Quarter Ended
June 30, 2011
 
Third Quarter Ended
September 30, 2011
 
Fourth Quarter Ended
December 31, 2011
 
 
(Unaudited)
Revenues
 
$
112,204

 
$
107,810

 
$
102,833

 
$
122,977

Net loss
 
(43,447
)
 
(62,505
)
 
(62,365
)
 
(53,443
)
Net loss per share - basic and diluted
 
$
(0.49
)
 
$
(0.69
)
 
$
(0.68
)
 
$
(0.58
)

(1) Revenues in the third and fourth quarter of 2012 included substantive milestones of $65.0 million and $10.0 million, respectively.
(2) Net income for the quarter ended December 31, 2012 included an income tax benefit of $335.8 million, primarily attributable to the release of substantially all of the Company's valuation allowance against its deferred tax assets.