Costs and Estimated Earnings on Uncompleted Contracts (Costs and Estimated Earnings on Uncompleted Contracts Accompanying Consolidated Balance Sheets) (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Costs and Estimated Earnings on Uncompleted Contracts [Abstract]
Costs and estimated earnings in excess of billings on uncompleted contracts	$ 42,146	$ 79,549
Billings in excess of costs and estimated earnings on uncompleted contracts (included in Other current liabilities)	(11,931)	(25,191)
Costs and estimated earnings on uncompleted contracts	$ 30,215	$ 54,358