Income Taxes (Schedule Of Effective Income Tax Rate Reconciliation) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Income Tax Disclosure [Abstract]
Income tax expense (benefit) at the statutory rate	$ 2,650	$ (889)	$ 24,474	$ 19,384
State income taxes, net of U.S. federal income tax effect	(791)	334	1,275	1,421
Other, net	0	(37)	104	167
Income tax expense (benefit)	$ 1,859	$ (592)	$ 25,853	$ 20,972