Income Taxes (Schedule Of Components Of Income Tax Expense (Benefit)) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income Tax Disclosure [Abstract]
U.S. federal, Current	$ 100,210	$ 113,920	$ 98,592
State and local, Current	10,725	10,328	6,742
U.S. federal, Deferred	15,125	(2,720)	(6,612)
State and local, Deferred	1,109	(116)	(2,473)
U.S. federal, Total	115,335	111,200	91,980
State and local, Total	11,834	10,212	4,269
Current, income tax expense (benefit)	110,935	124,248	105,334
Deferred, income tax expense (benefit)	16,234	(2,836)	(9,085)
Total income tax expense	$ 127,169	$ 121,412	$ 96,249