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
	Mar. 31, 2013		Mar. 31, 2012
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Net income (loss)	$ (6,557)		$ (4,815)
Interest on convertible notes, net of tax benefit	0		0	[1]
Net income (loss), diluted	$ (6,557)		$ (4,815)
Weighted average shares used to calculate net income (loss) per share, basic	28,470		26,656
Effect of escrow shares	0		0
Effect of convertible notes	0	[1]	0	[1]
Weighted average shares used to calculate net income (loss) per share, diluted	28,470		26,656
Basic	$ (0.23)		$ (0.18)
Diluted	$ (0.23)	[1],[2]	$ (0.18)	[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	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	0	[3]	0	[3]

[1] For the three months ended March 31, 2013 and 2012, 2.8 million and 3.5 million as-if converted shares associated with the Company's convertible senior notes were excluded from the calculation as their effect would have been anti-dilutive

[2] (A)For the three months ended March 31, 2013 and 2012, 0.1 million and 1.3 million contingently issuable shares were excluded from the calculation as their effect would have been anti-dilutive.

[3] For the three months ended March 31, 2013 and 2012, the following equity awards, by type, were excluded from the calculation, as their effect would have been anti-dilutive (in thousands): Three Months Ended March 31, 2013 2012Stock options2,892 2,651Restricted stock units488 502Performance based restricted stock units (D)2,101 835Total equity award shares excluded5,481 3,988

[4] For the three months ended March 31, 2013 and 2012, the Company excluded restricted stock units granted under the Long-Term Incentive Plan ("LTIP") and the overlay plan of the 2007 Stock Plan (the "Overlay Plan"), as the performance criteria required for issuance of the awards was not satisfied as of these dates.