Cash Flows (Summary Of Non-Cash Activities And Other Supplemental Data) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract]
Leasehold Improvements Paid By Landlord	$ 0	$ 0	$ 100
Capital Lease Obligations Incurred	6,191	18,747	865
Capital Expenditures Incurred but Not yet Paid	6,423	6,638	3,202
Increase (Decrease) in Notes Payable, Current	0	40,000	0
Cash Interest Paid, Continuing Operations	120,394	122,305	112,053
Income Taxes Paid, Net, Continuing Operations	$ 186,725	$ 99,772	$ 135,708