Cash Flows (Summary Of Non-Cash Activities And Other Supplemental Data) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract]
Finance lease additions	$ 14,255	$ 0	$ 0
Treasury stock not yet settled	0	0	985
Exercise of RLJE Warrants	0	0	20,086
Capital expenditures incurred but not yet paid	5,689	6,270	5,081
Cash interest paid	131,167	151,501	147,710
Income taxes paid, net	$ 99,852	$ 139,994	$ 138,433