Per Share Data (Details) (USD $) In Thousands, except Per Share data	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Basic and diluted net loss per share [Abstract]
Net loss (Numerator)	$ (62,505)	$ (25,474)	$ (105,952)	$ (55,996)
Weighted average shares outstanding, basic and diluted	90,436	81,492	89,799	81,330
Basic and diluted net loss per share (in dollars per share)	$ (0.69)	$ (0.31)	$ (1.18)	$ (0.69)
Stock Options [Member]
Antidilutive securities [Abstract]
Weighted average number, in thousands (in shares)	20,967	21,288	21,668	21,344
Weighted average exercise price (in dollars per share)	$ 20.71	$ 18.67	$ 20.48	$ 18.63
Restricted Stock [Member]
Antidilutive securities [Abstract]
Weighted average number, in thousands (in shares)	846	510	846	506