Accrued Restructuring - Restructuring Reserve Rollforward (Details) (USD $) In Thousands, unless otherwise specified									6 Months Ended
	Jun. 30, 2012	Dec. 31, 2011	Jun. 30, 2012 Lease Abandonment Charges [Member]	Dec. 31, 2011 Lease Abandonment Charges [Member]	Jun. 30, 2012 Fourth Quarter 2010 Restructuring [Member]	Dec. 31, 2011 Fourth Quarter 2010 Restructuring [Member]	Jun. 30, 2012 Continuous Computing Restructuring [Member]	Dec. 31, 2011 Continuous Computing Restructuring [Member]	Jun. 30, 2012 Facility Closing [Member] Lease Abandonment Charges [Member]	Jun. 30, 2012 Employee Severance [Member] Fourth Quarter 2010 Restructuring [Member]	Jun. 30, 2012 Employee Severance [Member] Continuous Computing Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Balance accrued as of December 31, 2011	$ 2,019	$ 4,202	$ 1,333	$ 0	$ 22	$ 218	$ 664	$ 3,900		$ 218	$ 3,900
Additions									1,333	15	1,032
Reversals										(19)	(165)
Expenditures										(192)	(4,103)
Balance accred as of June 30, 2012	$ 2,019	$ 4,202	$ 1,333	$ 0	$ 22	$ 218	$ 664	$ 3,900	$ 1,333	$ 22	$ 664