Accrued Restructuring (Details) (USD $) In Thousands, unless otherwise specified							15 Months Ended				6 Months Ended
	Jun. 30, 2012	Dec. 31, 2011	Jun. 30, 2012 2009 Restructuring [Member]	Dec. 31, 2011 2009 Restructuring [Member]	Jun. 30, 2012 Fourth Quarter 2010 Restructuring [Member]	Dec. 31, 2011 Fourth Quarter 2010 Restructuring [Member]	Jun. 30, 2012 Continuous Computing Restructuring [Member] Positions	Dec. 31, 2011 Continuous Computing Restructuring [Member]	Jun. 30, 2012 Lease Abandonment Charges [Member]	Dec. 31, 2011 Lease Abandonment Charges [Member]	Jun. 30, 2012 Facility Closing [Member] Lease Abandonment Charges [Member]	Jun. 30, 2012 Employee Severance [Member] Fourth Quarter 2010 Restructuring [Member]	Dec. 31, 2011 Employee Severance [Member] Fourth Quarter 2010 Restructuring [Member]	Jun. 30, 2012 Employee Severance [Member] Continuous Computing Restructuring [Member]	Dec. 31, 2011 Employee Severance [Member] Continuous Computing Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	$ 2,019	$ 4,202	$ 0	$ 84	$ 22	$ 218	$ 664	$ 3,900	$ 1,333	$ 0	$ 1,333	$ 22	$ 218	$ 664	$ 3,900
Restructuring and Related Cost, Number of Positions Eliminated, Inception to Date							117
Restructuring and Related Cost, Cost Incurred to Date							5,917
Restructuring and Related Cost, Incurred Cost											$ 1,300	$ (4)