Contract Assets and Liabilities (Schedule Of Contract Assets) (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Contract with Customer, Contract Asset, Contract Liability, and Receivable [Abstract]
Retention receivable	$ 552,695	$ 568,881
Costs and estimated earnings in excess of billings:
Claims	764,430	833,352
Unapproved change orders	515,851	418,054
Other unbilled costs and profits	92,359	105,362
Total costs and estimated earnings in excess of billings	1,372,640	1,356,768
Capitalized contract costs	70,400	69,027
Total contract assets	$ 1,995,735	$ 1,994,676