Costs and Estimated Earnings on Uncompleted Contracts (Costs and Estimated Earnings on Uncompleted Contracts Accompanying Consolidated Balance Sheets) (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Costs and Estimated Earnings on Uncompleted Contracts [Abstract]
Costs and estimated earnings in excess of billings on uncompleted contracts	$ 16,535	$ 16,252
Billings in excess of costs and estimated earnings on uncompleted contracts (included in Other current liabilities)	(3,262)	(5,597)
Costs and estimated earnings on uncompleted contracts	$ 13,273	$ 10,655