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, 2012		Sep. 30, 2011		Sep. 30, 2012		Sep. 30, 2011
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Net income (loss)	$ (35,111)		$ 5,461		$ (38,619)		$ 5,122	[1]
Interest on convertible notes, net of tax benefit	0	[2]	456	[2]	0	[2]	0	[2]
Net income (loss), diluted	$ (35,111)		$ 5,917		$ (38,619)		$ 5,122
Weighted average shares used to calculate net income (loss) per share, basic	27,534		26,432		26,985		25,038
Effect of escrow shares	0		1,242		0	[3]	414
Effect of convertible notes	0	[2]	3,837	[2]	0	[2]	0	[2]
Weighted average shares used to calculate net income (loss) per share, diluted	27,534		31,657	[4]	26,985		25,595
Basic	$ (1.28)		$ 0.21	[4]	$ (1.43)		$ 0.20	[4]
Diluted	$ (1.28)	[2],[3]	$ 0.19	[2],[3],[4]	$ (1.43)	[2],[3]	$ 0.20	[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	[5],[6]	84	[5],[6]	0	[5],[6]	88	[5],[6]
Stock Options [Member]
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Effect of dilutive equity awards	0	[6]	62	[6]	0	[6]	55	[6]

[1] (A)As adjusted to reflect the impact of additional tax-related adjustments to the Company's purchase accounting for Continuous Computing in accordance with ASC 805-10 "Business Combinations." See Note 2 — Acquisitions for additional information.

[2] For the three and nine months ended September 30, 2012 and the nine months ended September 30, 2011, 3.8 million and 3.6 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

[3] For the three and nine months ended September 30, 2012, the 0.8 million and 1.1 million contingently issuable shares were excluded from the calculation as their effect would have been anti-dilutive.

[4] As adjusted to reflect the impact of additional tax-related adjustments to the Company's purchase accounting for Continuous Computing in accordance with ASC 805-10 "Business Combinations." See Note 2 — Acquisitions for additional information

[5] For the three and nine months ended September 30, 2012, the Company excluded restricted shares of 1.0 million granted under the Long-Term Incentive Plan and Overlay Plan, 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, 2011, the Company excluded restricted shares of 0.7 million granted under the Long-Term Incentive Plan, as the performance criteria required for issuance of the awards was not satisfied as of these dates.

[6] For the three and nine months ended September 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): Three Months Ended Nine Months Ended September 30, September 30, 2012 2011 2012 2011Stock options2,476 2,953 2,476 2,962Restricted stock units (D)1,708 1,404 1,708 1,400Total equity award shares excluded4,184 4,357 4,184 4,362