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Commitments And Contingencies (Narrative) (Details) (USD $)
3 Months Ended9 Months Ended
Sep. 30, 2011
years
Sep. 30, 2010
Sep. 30, 2011
years
Sep. 30, 2010
Commitments And Contingencies    
Limited warranty on most hardware products (in number of years)1 1 
Warranty on a subset of our hardware products, minimum (in number of years)2 2 
Warranty on a subset of our hardware products, maximum (in number of years)3 3 
Amount of non-cancelable purchase commitments with various suppliers of customized inventory and inventory components$ 11,900,000 $ 11,900,000 
Amount of guarantees for payment of customs and foreign grants4,200,000 4,200,000 
Percentage of sales to U.S. government under contract2.00% 2.00% 
GSA Accrual$ 13,107,000$ 0$ 13,107,000$ 0