Basic and Diluted Net Income (Loss) Per Share - Earnings (Loss) Per Share Calculation (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2012		Jun. 30, 2011		Jun. 30, 2012		Jun. 30, 2011
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Net income (loss)	$ 1,307		$ 190		$ (3,508)		$ (339)
Interest on convertible notes, net of tax benefit	0	[1]	0	[1]	0	[1]	0	[1]
Net income (loss), diluted	$ 1,307		$ 190		$ (3,508)		$ (339)
Weighted average shares used to calculate net income (loss) per share, basic	26,759		24,334		26,708		24,341
Effect of escrow shares	1,344		0		0	[2]	0
Effect of convertible notes	0	[1]	0	[1]	0	[1]	0	[1]
Weighted average shares used to calculate net income (loss) per share, diluted	28,256		24,475		26,708		24,341
Basic	$ 0.05		$ 0.01		$ (0.13)		$ (0.01)
Diluted	$ 0.05	[1],[2]	$ 0.01	[1],[2]	$ (0.13)	[1],[2]	$ (0.01)	[1],[2]
Restricted Stock Units (RSUs) [Member]
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Effect of dilutive equity awards	78	[3],[4]	122	[3],[4]	0	[3],[4]	0	[3],[4]
Stock Options [Member]
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Effect of dilutive equity awards	75	[3]	19	[3]	0	[3]	0	[3]

[1] For the three and six months ended June 30, 2012 and 2011, 3.5 million and 3.8 million as-if converted shares associated with the Company's 2013 and 2015 convertible senior notes were excluded from the calculation as their effect would have been anti-dilutive

[2] For the six months ended June 30, 2012, the 1.3 million contingently issuable shares were excluded from the calculation as their effect would have been anti-dilutive.

[3] For the three and six months ended June 30, 2012 and 2011, the following equity awards, by type, were excluded from the calculation, as their effect would have been anti-dilutive (in thousands): For the Three Months Ended For the Six Months Ended June 30, June 30, 2012 2011 2012 2011Dilutive stock options2,330 2,369 2,400 2,495Dilutive restricted stock units399 80 478 401Total equity award shares excluded2,729 2,449 2,878 2,896

[4] For the three and six months ended June 30, 2012 and 2011 the Company excluded restricted shares of 728,700 and 847,900 granted under the Long-Term Incentive Plan, as the performance criteria required for issuance of the awards was not satisfied as of these dates.