Business Segments (Reconciliation Of Segment Results To Consolidated Income Before Income Taxes) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Segment Reporting [Abstract]
Income (loss) from construction operations	$ (90,554)	$ 68,753	$ (100,461)	$ 118,457
Other income, net	1,020	1,431	4,717	1,606
Interest expense	(16,204)	(17,938)	(32,696)	(35,748)
Income (loss) before income taxes	$ (105,738)	$ 52,246	$ (128,440)	$ 84,315