Cash Flows (Summary Of Non-Cash Activities And Other Supplemental Data) (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Noncash Investing and Financing Items [Abstract]
Increase in capital lease obligations	$ 10,983	$ 0
Capital expenditures incurred but not yet paid	2,101	1,957
Cash interest paid	69,449	61,223
Income taxes paid, net	$ 75,450	$ 99,177