Costs And Estimated Earnings On Uncompleted Contracts (Summary Of Costs And Estimated Earnings On Uncompleted Contracts) (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Costs And Estimated Earnings On Uncompleted Contracts [Abstract]
Costs incurred on uncompleted contracts	$ 79,151	$ 113,654
Estimated earnings	22,593	48,949
Billings to date	(86,602)	(143,323)
Costs and estimated earnings on uncompleted contracts	$ 15,142	$ 19,280