Accrued Restructuring - Restructuring Reserve Rollforward (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended						9 Months Ended
	Sep. 30, 2012	Dec. 31, 2011	Sep. 30, 2012 Third Quarter Restructuring Charges [Member] [Member]	Sep. 30, 2012 Lease Abandonment Charges [Member]	Sep. 30, 2012 Fourth Quarter 2010 Restructuring [Member]	Dec. 31, 2011 Fourth Quarter 2010 Restructuring [Member]	Dec. 31, 2011 Continuous Computing Restructuring [Member]	Sep. 30, 2012 Facility Closing [Member] Lease Abandonment Charges [Member]	Sep. 30, 2012 Employee Severance [Member] Continuous Computing Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Balance accrued as of December 31, 2011		$ 4,202	$ 0	$ 0	$ 0	$ 218	$ 3,900	$ 1,081	$ 3,900
Restructuring Charges	700		1,253	2,012					1,043
Restructuring Reserve, Accrual Adjustment			0	0					(269)
Expenditures			(229)	(931)					(4,543)
Balance accred as of June 30, 2012	$ 2,236	$ 4,202	$ 1,024		$ 0	$ 218	$ 3,900	$ 1,081	$ 131