Contract Assets and Liabilities (Schedule Of Contract Assets) (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Contract with Customer, Contract Asset, Contract Liability, and Receivable [Abstract]
Retainage receivable	$ 568,881	$ 648,441
Claims	833,352	752,783
Unapproved change orders	418,054	415,489
Other unbilled costs and profits	105,362	68,462
Total costs and estimated earnings in excess of billings	1,356,768	1,236,734
Capitalized contract costs	69,027	74,452
Total contract assets	$ 1,994,676	$ 1,959,627