Cash Flows (Summary Of Non-Cash Activities And Other Supplemental Data) (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract]
Capital expenditures incurred but not yet paid	$ 1,731	$ 2,419
Treasury stock not yet settled	832	0
Cash interest paid	76,664	71,750
Income taxes paid, net	$ 77,985	$ 60,413