Basic and Diluted Net Income (Loss) Per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Income (numerator)
Net loss	$ (27,133)	$ (4,124)	$ (37,903)	$ (4,037)
Shares (denominator)
Weighted-average basic common shares outstanding (in shares)	89,950	92,125	91,723	92,027
Effect of dilutive securities-stock rights (in shares)	0	0	0	0
Weighted-average diluted common shares outstanding (in shares)	89,950	92,125	91,723	92,027
Basic and diluted net loss per share:
Basic net loss income per share	$ (0.30)	$ (0.04)	$ (0.41)	$ (0.04)
Diluted net loss income per share	$ (0.30)	$ (0.04)	$ (0.41)	$ (0.04)