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
Computation of basic and diluted net income (loss) per share
Net income (loss)	$ 3,279	$ (3,688)	$ (9,136)	$ (58,770)
Weighted average common basic shares	40,873	48,232	40,856	48,248
Effect of dilutive securities	70
Weighted average common dilutive shares	40,943	48,232	40,856	48,248
Basic and diluted net income (loss) per share	$ 0.08	$ (0.08)	$ (0.22)	$ (1.22)