Quarterly Financial Data (Schedule Of Quarterly Financial Information) (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Quarterly Financial Data [Abstract]
Revenues	$ 2,886,331	$ 2,255,319	$ 2,053,131
Gross profit	255,235	205,901	175,048
Net Income (Loss) Attributable to Parent	$ 68,229	$ 35,770	$ 14,055
Earnings (loss) per common share, Basic	$ 1.94	$ 1.00	$ 0.38
Earnings (loss) per common share, Diluted	$ 1.91	$ 0.99	$ 0.38