Description Of Business And Segment Reporting (Summary Of Capital Expenditures) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Segment Reporting Information [Line Items]
Total capital expenditures	$ 14,428	$ 16,759	$ 47,722
Segment [Member]
Segment Reporting Information [Line Items]
Total capital expenditures	$ 14,428	16,686	47,555
Corporate [Member]
Segment Reporting Information [Line Items]
Total capital expenditures		$ 73	$ 167