Contract Assets and Liabilities (Schedule Of Contract Assets) (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Contract with Customer, Contract Asset, Contract Liability, and Receivable [Abstract]
Retention receivable	$ 561,856	$ 585,556
Costs and estimated earnings in excess of billings:
Claims	533,227	677,367
Unapproved change orders	573,224	601,681
Other unbilled costs and profits	69,344	98,480
Total costs and estimated earnings in excess of billings	1,175,795	1,377,528
Capitalized contract costs	131,308	49,441
Total contract assets	$ 1,868,959	$ 2,012,525