Income Taxes (Schedule Of The Provision For (Benefit From) Income Taxes) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Tax Disclosure [Abstract]
Federal, Current	$ 215,903	$ 190,917	$ 120,018
State	22,249	15,327	8,729
Foreign, Current	(137)	(837)	(395)
Total Current	238,015	205,407	128,352
Federal, Deferred	94,471	(5,398)	6,732
State, Deferred	(556)	(519)	7,682
Foreign, Deferred	(183)	124	(300)
Total Deferred	93,732	(5,793)	14,114
Total provision	$ 331,747	$ 199,614	$ 142,466