Inventories (Components Of Inventories) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Inventories [Abstract]
Raw material	$ 41,221	$ 45,795
Work in process	1,525	872
Deferred costs of long-term contracts	83	220
Finished goods	98,859	101,111
Inventories, gross	141,688	147,998
Inventory reserves	(15,569)	(14,710)
Inventories, net	$ 126,119	$ 133,288