Accrued Restructuring Restructuring Reserve Rollforward (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended			12 Months Ended			9 Months Ended						9 Months Ended
	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Sep. 30, 2012 Lease Abandonment Charges [Member]	Sep. 30, 2012 Third Quarter Restructuring Charges [Member] [Member]	Dec. 31, 2012 Facility Closing [Member] Lease Abandonment Charges [Member]	Dec. 31, 2011 Facility Closing [Member] Lease Abandonment Charges [Member]	Dec. 31, 2012 Facility Closing [Member] Third Quarter Restructuring Charges [Member] [Member]	Dec. 31, 2011 Facility Closing [Member] Third Quarter Restructuring Charges [Member] [Member]	Sep. 30, 2012 Employee Severance [Member] Continuous Computing Restructuring [Member]	Dec. 31, 2012 Employee Severance [Member] Continuous Computing Restructuring [Member]
Restructuring Reserve [Roll Forward]
Balance accrued as of December 31, 2011				$ 4,202					$ 990	$ 0	$ 0	$ 0	$ 3,900	$ 198
Restructuring Charges	2,000	6,000	3,000	3,667	5,071	1,575	1,658	1,253					1,048
Restructuring Reserve, Accrual Adjustment							0	0					(276)
Expenditures							(668)	(1,253)					(4,474)
Balance accred as of June 30, 2012	$ 4,202			$ 1,188	$ 4,202				$ 990	$ 0	$ 0	$ 0		$ 198