Income Taxes (Schedule Of Effective Income Tax Rate Reconciliation) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract]
Computed expected tax expense (benefit)	$ 212,857	$ 85,818	$ 46,052
Increase (decrease) resulting from State and foreign income taxes	15,046	(2,106)	1,839
Increase (decrease) resulting other	(2,883)	2,092	(2,460)
Income tax	$ 225,020	$ 85,804	$ 45,431