Cash Flows (Summary Of Non-Cash Activities And Other Supplemental Data) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract]
Treasury stock not yet settled	$ 0	$ 985	$ 995
Exercise of RLJE Warrants	0	20,086	5,001
Capital expenditures incurred but not yet paid	6,270	5,081	5,889
Cash interest paid	151,501	147,710	110,650
Income taxes paid, net	$ 139,994	$ 138,433	$ 219,425