Net Income (Loss) Per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended										6 Months Ended		12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2012	Dec. 31, 2011	Jun. 30, 2011	Jun. 30, 2010
Computation of basic and diluted net income (loss) per share
Net income (loss)	$ 96	$ 3,279	$ (4,208)	$ (8,207)	$ (25,749)	$ (3,688)	$ (53,474)	$ (1,608)	$ (2,090)	$ 392	$ (29,437)	$ (1,698)	$ (9,040)	$ (84,519)	$ (56,780)	$ 7,040
Weighted average common basic shares											47,707		40,861		48,171	47,961
Effect of dilutive securities																457
Weighted average common dilutive shares											47,707		40,861		48,171	48,418
Basic net income (loss) per share											$ (0.62)		$ (0.22)		$ (1.18)	$ 0.15
Diluted net income (loss) per share											$ (0.62)		$ (0.22)		$ (1.18)	$ 0.15