Contract Assets and Liabilities (Schedule Of Contract Assets) (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Contract with Customer, Contract Asset, Contract Liability, and Receivable [Abstract]
Retention receivable	$ 557,358	$ 585,556
Costs and estimated earnings in excess of billings:
Claims	572,617	677,367
Unapproved change orders	576,253	601,681
Other unbilled costs and profits	75,793	98,480
Total costs and estimated earnings in excess of billings	1,224,663	1,377,528
Capitalized contract costs	52,798	49,441
Total contract assets	$ 1,834,819	$ 2,012,525