Income Taxes (Schedule Of Total Provision For Income Taxes) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income Tax Disclosure [Abstract]
Current taxes, Federal	$ 2,084	$ (3,159)	$ (6,856)
Current taxes, State	(1,388)	743	(3,079)
Current taxes	696	(2,416)	(9,935)
Deferred taxes, Federal	13,768	109,363	88,021
Deferred taxes, State	1,762	16,188	12,651
Deferred taxes	15,530	125,551	100,672
Total income taxes	$ 16,226	$ 123,135	$ 90,737