Accrued Restructuring (Details) (USD $)	3 Months Ended						15 Months Ended			9 Months Ended		9 Months Ended		9 Months Ended
	Sep. 30, 2012	Dec. 31, 2011	Sep. 30, 2012 2009 Restructuring [Member]	Dec. 31, 2011 2009 Restructuring [Member]	Sep. 30, 2012 Fourth Quarter 2010 Restructuring [Member]	Dec. 31, 2011 Fourth Quarter 2010 Restructuring [Member]	Jun. 30, 2012 Continuous Computing Restructuring [Member]	Sep. 30, 2012 Continuous Computing Restructuring [Member] Positions	Dec. 31, 2011 Continuous Computing Restructuring [Member]	Sep. 30, 2012 Lease Abandonment Charges [Member]	Dec. 31, 2011 Lease Abandonment Charges [Member]	Sep. 30, 2012 Third Quarter Restructuring Charges [Member] [Member]	Dec. 31, 2011 Third Quarter Restructuring Charges [Member] [Member]	Sep. 30, 2012 Executive Severance [Member] Continuous Computing Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	$ 700,000									$ 2,012,000		$ 1,253,000		$ 900,000
Restructuring Reserve, Accrual Adjustment										0		0
Expenditures										(931,000)		(229,000)
Restructuring Reserve	2,236,000	4,202,000	0	84,000	0	218,000			3,900,000		0	1,024,000	0
Restructuring and Related Cost, Number of Positions Eliminated, Inception to Date								117
Restructuring and Related Cost, Cost Incurred to Date							$ 5,800,000