Contract Assets and Liabilities (Schedule Of Contract Assets) (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Contract with Customer, Contract Asset, Contract Liability, and Receivable [Abstract]
Retention receivable	$ 580,926	$ 585,556
Costs and estimated earnings in excess of billings:
Claims	562,646	677,367
Unapproved change orders	512,831	601,681
Other unbilled costs and profits	68,369	98,480
Total costs and estimated earnings in excess of billings	1,143,846	1,377,528
Capitalized contract costs	117,913	49,441
Total contract assets	$ 1,842,685	$ 2,012,525