Contract Assets and Liabilities (Schedule Of Contract Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Contract with Customer, Contract Asset, Contract Liability, and Receivable [Abstract]
Retention payable	$ 223,138	$ 246,562
Billings in excess of costs and estimated earnings	1,103,530	975,812
Total contract liabilities	$ 1,326,668	$ 1,222,374