Costs And Estimated Earnings On Uncompleted Contracts (Costs And Estimated Earnings On Uncompleted Contracts Accompanying Consolidated Balance Sheets) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Costs And Estimated Earnings On Uncompleted Contracts [Abstract]
Costs and estimated earnings in excess of billings on uncompleted contracts	$ 11,127	$ 16,934
Billings in excess of costs and estimated earnings on uncompleted contracts (included in Other current liabilities)	(1,392)	(3,807)
Costs and estimated earnings on uncompleted contracts	$ 9,735	$ 13,127