Per Share Data (Tables)

6 Months Ended

Jun. 30, 2011

Per Share Data [Abstract]

Basic and diluted net loss per share

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

	Three Months Ended  June 30,
	2011	2010
Net loss (Numerator)	$(62,505)	$(25,474)
Weighted-average shares, in thousands (Denominator)	90,436	81,492
Basic and diluted net loss per share	$(0.69)	$(0.31)

	Six Months Ended  June 30,
	2011	2010
Net loss (Numerator)	$(105,952)	$(55,996)
Weighted-average shares, in thousands (Denominator)	89,799	81,330
Basic and diluted net loss per share	$(1.18)	$(0.69)

Antidilutive securities

Shares issuable upon the exercise of stock options and vesting of restricted stock awards, which have been excluded from the June 30, 2011 and 2010 diluted per share amounts because their effect would have been antidilutive, include the following:

	Three months ended June 30,
	2011	2010
Stock Options:
Weighted average number, in thousands	20,967	21,288
Weighted average exercise price	$20.71	$18.67
Restricted Stock:
Weighted average number, in thousands	846	510

	Six months ended June 30,
	2011	2010
Stock Options:
Weighted average number, in thousands	21,668	21,344
Weighted average exercise price	$20.48	$18.63
Restricted Stock:
Weighted average number, in thousands	846	506