Cash Flows (Summary Of Non-Cash Activities And Other Supplemental Data) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract]
Increase in capital lease obligations	$ 628	$ 0	$ 10,982
Treasury stock not yet settled	985	995	10,454
Exercise of RLJE Warrants	20,086	5,001	0
Capital expenditures incurred but not yet paid	5,081	5,889	6,988
Cash interest paid—continuing operations	147,710	110,650	128,319
Income taxes paid, net—continuing operations	$ 138,433	$ 219,425	$ 106,476