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				9 Months Ended
	Sep. 30, 2013		Sep. 30, 2012		Sep. 30, 2013		Sep. 30, 2012
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Net income (loss)	$ (12,720)		$ (35,111)		$ (23,389)		$ (38,619)
Interest on convertible notes, net of tax benefit	0		0	[1]	0		0	[1]
Net income (loss), diluted	$ (12,720)		$ (35,111)		$ (23,389)		$ (38,619)
Weighted average shares used to calculate net income (loss) per share, basic	28,931		27,534		28,692		26,985
Effect of escrow shares	0	[2]	0	[2]	0	[2]	0	[2]
Effect of convertible notes	0	[1]	0	[1]	0	[1]	0	[1]
Weighted average shares used to calculate net income (loss) per share, diluted	28,931		27,534		28,692		26,985
Basic (in dollars per share)	$ (0.44)		$ (1.28)		$ (0.82)		$ (1.43)
Diluted (in dollars per share)	$ (0.44)	[1],[2],[3],[4]	$ (1.28)	[1],[2],[3],[4]	$ (0.82)	[1],[2],[3],[4]	$ (1.43)	[1],[2],[3],[4]
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]	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]	0	[3]	0	[3]

[1] For the three months ended September 30, 2013 and 2012, 2.1 million and 3.8 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. For the nine months ended September 30, 2013 and 2012, 2.3 million and 3.6 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 September 30, 2013, there were no remaining contingently issuable shares outstanding. For the three months ended September 30, 2012, 0.8 million contingently issuable shares were excluded from the calculation as their effect would have been anti-dilutive. For the nine months ended September 30, 2013 and 2012, 20,000 and 1.1 million contingently issuable shares were excluded from the calculation as their effect would have been anti-dilutive.

[3] For the three and nine months ended September 30, 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 Nine Months Ended September 30, September 30, 2013 2012 2013 2012Stock options3,561 2,476 3,561 2,476Restricted stock units376 658 376 658Performance based restricted stock units (D)1,678 1,050 1,678 1,050Total equity award shares excluded5,615 4,184 5,615 4,184

[4] For the three and nine months ended September 30, 2013, the Company excluded 1.5 million restricted stock units granted under the Long-Term Incentive Plan ("LTIP") as the performance criteria required for issuance of the awards was not satisfied as of these dates. For the three and nine months ended September 30, 2013, the Company excluded 0.2 million restricted stock units granted under the Overlay Plan of the 2007 Stock Plan, as the awards had been earned but not vested as of these dates.