Costs And Estimated Earnings On Uncompleted Contracts (Cost And Estimated Earnings On Uncompleted Contracts Accompanying Consolidated Balance Sheets) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Costs And Estimated Earnings On Uncompleted Contracts [Abstract]
Costs and estimated earnings in excess of billings on uncompleted contracts	$ 16,993	$ 17,655
Other current liabilities (Billings in excess of costs and estimated earnings on uncompleted contracts)	(322)	(303)
Costs in excess of billings on uncompleted contracts or programs	$ 16,671	$ 17,352