Per Share Data (Tables)

6 Months Ended

Jun. 30, 2012

Per Share Data [Abstract]

Basic and Diluted Net Loss Per Share

The calculations of basic and diluted net income (loss) per share are as follows:

	Three Months Ended June 30,
	2012	2011
Numerator Net income (loss) - basic and diluted	$76,743	$(62,505)
Denominator (in thousands)
Weighted average shares - basic	94,589	90,436
Effect of dilutive securities:
Stock options	14,055
Restricted stock	692
Warrants	831
Dilutive potential shares	15,578
Weighted average shares - diluted	110,167	90,436
Net income (loss) per share - basic	$0.81	$(0.69)
Net income (loss) per share - diluted	$0.70	$(0.69)

	Six Months Ended June 30,
	2012	2011
Numerator Net income (loss) - basic and diluted	$88,394	$(105,952)
Denominator (in thousands)
Weighted average shares - basic	94,017	89,799
Effect of dilutive securities:
Stock options	13,964
Restricted stock	676
Warrants	341
Dilutive potential shares	14,981
Weighted average shares - diluted	108,998	89,799
Net income (loss) per share - basic	$0.94	$(1.18)
Net income (loss) per share - diluted	$0.81	$(1.18)

Antidilutive Securities

Shares issuable upon the exercise of stock options and warrants, vesting of restricted stock awards, and conversion of convertible senior notes, which have been excluded from the June 30, 2012 and 2011 diluted per share amounts because their effect would have been antidilutive, include the following:

	Three Months Ended June 30,
	2012	2011
Stock options:
Weighted average number, in thousands	89	20,967
Weighted average exercise price	$124.64	$20.71
Restricted stock:
Weighted average number, in thousands		846

Convertible senior notes:

  Weighted average number, in thousands                                                                                                                                                                                                                                      4,761

Warrants:

  Weighted average number, in thousands                                                                                                                                                                                                                                      3,930

	Six Months Ended June 30,
	2012	2011
Stock options:
Weighted average number, in thousands	47	21,668
Weighted average exercise price	$123.29	$20.48
Restricted stock:
Weighted average number, in thousands	11	846

Convertible senior notes:

  Weighted average number, in thousands                                                                                                                                                                                                                                      4,761

Warrants:

  Weighted average number, in thousands                                                                                                                                                                                                                                      4,420