Income Taxes (Schedule Of Income Tax Expense) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income Tax Disclosure [Abstract]
Federal current	$ 69,590	$ 6,275	$ 56,030
State current	10,088	6,664	11,195
Foreign current	(478)	1,347	894
Current income tax expense (benefit), total	79,200	14,286	68,119
Federal deferred	(8,630)	50,297	(8,523)
State deferred	(438)	7,566	(3,398)
Deferred income tax expense (benefit), total	(9,068)	57,863	(11,921)
Total income tax expense	$ 70,132	$ 72,149	$ 56,198