Cash Flows (Summary Of Non-Cash Activities And Other Supplemental Data) (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract]
Capital expenditures incurred but not yet paid	$ 1,659	$ 2,835
Cash interest paid	104,698	97,437
Income taxes paid, net	$ 121,110	$ 96,272