Contract Assets and Liabilities (Schedule Of Contract Assets) (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Contract with Customer, Contract Asset, Contract Liability, and Receivable [Abstract]
Retention receivable	$ 542,301	$ 568,881
Costs and estimated earnings in excess of billings:
Claims	788,876	833,352
Unapproved change orders	482,945	418,054
Other unbilled costs and profits	84,786	105,362
Total costs and estimated earnings in excess of billings	1,356,607	1,356,768
Capitalized contract costs	75,278	69,027
Total contract assets	$ 1,974,186	$ 1,994,676