Cash Flows (Summary Of Non-Cash Activities And Other Supplemental Data) (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Noncash Investing and Financing Items [Abstract]
Increase in capital lease obligations	$ 11,040	$ 0
Capital expenditures incurred but not yet paid	1,421	1,393
Cash interest paid	79,951	98,028
Income taxes paid, net	$ 98,997	$ 146,264