Contract Assets and Liabilities (Schedule Of Contract Assets) (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Contract with Customer, Contract Asset, Contract Liability, and Receivable [Abstract]
Retention receivable	$ 583,789	$ 568,881
Costs and estimated earnings in excess of billings:
Claims	741,678	833,352
Unapproved change orders	584,388	418,054
Other unbilled costs and profits	122,275	105,362
Total costs and estimated earnings in excess of billings	1,448,341	1,356,768
Capitalized contract costs	60,740	69,027
Total contract assets	$ 2,092,870	$ 1,994,676