Commitments, Contingencies And Leases (Narrative) (Details) (USD $)	0 Months Ended	3 Months Ended	12 Months Ended
	Jun. 06, 2012	Sep. 30, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Commitments, Contingencies And Leases [Abstract]
Rent expense under operating leases			$ 17,100,000	$ 16,300,000	$ 13,500,000
Amount of non-cancelable purchase commitments with various suppliers of customized inventory and inventory components			7,300,000
Amount of guarantees for payment of customs and foreign grants			5,000,000
GSA Accrual		13,100,000	(1,349,000)	13,107,000
Settlement payments	$ 11,800,000