Commitments And Contingencies (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended
	Sep. 30, 2011	Jun. 30, 2012	Dec. 31, 2011
Commitments And Contingencies [Abstract]
Limited warranty on most hardware products (in number of years)		1 year
Warranty on a subset of our hardware products, minimum (in number of years)		2 years
Warranty on a subset of our hardware products, maximum (in number of years)		3 years
Amount of non-cancelable purchase commitments with various suppliers of customized inventory and inventory components		$ 9.0
Amount of guarantees for payment of customs and foreign grants		4
Percentage of sales to U.S. government under contract			2.00%
GSA accrual	13.1
Settlement payments		$ 11.8