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 from continuing operations before income taxes
Income from continuing operations before income taxes	$ 82,133	$ 58,145	$ 18,410
Income tax expense at the statutory rate	(28,747)	(20,350)	(6,444)
State income taxes, net of U.S. federal income tax benefit	(1,681)	(1,722)	(792)
Adjustment to prior period state income taxes, net of U.S. federal income tax benefit	0	(4,735)	0
Previously unbenefitted capital loss associated with investment		1,171
Nondeductible expenses	(93)	25	(46)
Other	(435)	0	597
Total income tax expense from continuing operations	30,956	25,611	6,685
United States [Member]
Income from continuing operations before income taxes
Income from continuing operations before income taxes	$ 82,133	$ 58,145	$ 18,410