Cash Flows (Summary Of Non-Cash Activities And Other Supplemental Data) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Noncash Investing and Financing Items [Abstract]
Increase in capital lease obligations	$ 10,983	$ 0
Capital expenditures incurred but not yet paid	2,722	2,399
Cash interest paid	46,436	37,132
Income taxes paid, net	$ 5,600	$ 13,005