Accrued Restructuring Costs (Summary Of Restructuring Activity) (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended		12 Months Ended		9 Months Ended	12 Months Ended	3 Months Ended	9 Months Ended		12 Months Ended
	Dec. 31, 2010		Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2010 Personnel [Member]	Dec. 31, 2011 Personnel [Member]	Dec. 31, 2010 Facilities [Member]	Dec. 31, 2010 Facilities [Member]		Dec. 31, 2011 Facilities [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring reserve, beginning balance			$ 4,869			$ 2,752				$ 2,117
Restructuring costs	8,064		(62)	8,064	6,501		1,600	1,563		(62)
Cash payments	(3,818)		(3,764)		(3,749)	(2,509)		(69)		(1,255)
Other	623	[1]						623	[1]
Restructuring reserve, ending balance	$ 4,869		$ 1,043	$ 4,869	$ 2,752	$ 243	$ 2,117	$ 2,117		$ 800

[1] Reflects the liability initially recorded for the acquired above market operating lease terms at acquisition, which was subsequently restructured.