Contract Assets and Liabilities (Schedule Of Contract Assets) (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Contract with Customer, Contract Asset, Contract Liability, and Receivable [Abstract]
Retention receivable	$ 585,556	$ 568,881
Claims	677,367	833,352
Unapproved change orders	601,681	418,054
Other unbilled costs and profits	98,480	105,362
Total costs and estimated earnings in excess of billings	1,377,528	1,356,768
Capitalized contract costs	49,441	69,027
Total contract assets	$ 2,012,525	$ 1,994,676