Basic and Diluted Net Loss Per Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Net (loss) income (numerator)
Net loss from continuing operations	$ (12,383)	$ (10,912)	$ (24,670)	$ (7,044)
Net loss from discontinued operations	(592)	(1,677)	(1,458)	(3,726)
Net loss	$ (12,975)	$ (12,589)	$ (26,128)	$ (10,770)
Shares (denominator)
Weighted-average basic common shares outstanding (in shares)	85,016,000	92,767,000	84,813,000	92,625,000
Weighted-average diluted common shares outstanding (in shares)	85,016,000	92,767,000	84,813,000	92,625,000
Basic and diluted per share amounts
Basic net loss per share from continuing operations (in usd per share)	$ (0.14)	$ (0.12)	$ (0.29)	$ (0.08)
Basic net loss per share from discontinued operations (in usd per share)	$ (0.01)	$ (0.02)	$ (0.02)	$ (0.04)
Total net loss per share (in usd per share)	$ (0.15)	$ (0.14)	$ (0.31)	$ (0.12)
Diluted net loss per share from continuing operations (in usd per share)	$ (0.14)	$ (0.12)	$ (0.29)	$ (0.08)
Diluted net loss per share from discontinued operations (in usd per share)	$ (0.01)	$ (0.02)	$ (0.02)	$ (0.04)
Total diluted net loss per share (in usd per share)	$ (0.15)	$ (0.14)	$ (0.31)	$ (0.12)
Anti-dilutive weighted-average stock rights outstanding (in shares)	0	0	0	0