Income Taxes (Schedule Of The Provision For (Benefit From) Income Taxes) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income Tax Expense (Benefit) [Abstract]
Federal, Current	$ 190,917	$ 120,018	$ 97,822
State	15,327	8,729	8,128
Foreign, Current	(837)	(395)	1,464
Total Current	205,407	128,352	107,414
Federal, Deferred	(5,398)	6,732	7,083
State, Deferred	(519)	7,682	6,829
Foreign, Deferred	124	(300)	241
Total Deferred	(5,793)	14,114	14,153
Total provision	$ 199,614	$ 142,466	$ 121,567