Income Taxes (Schedule Of The Provision For Income Taxes (Benefit)) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income Taxes [Abstract]
Current taxes: Federal	$ 32,111	$ 20,847	$ 35,998
Current taxes: State	9,199	6,416	9,647
Current taxes: Foreign	121	(127)	(19)
Current taxes: Total	41,431	27,136	45,626
Deferred taxes: Federal	35,072	20,262	(36,965)
Deferred taxes: State	8,498	5,958	(11,821)
Deferred taxes: Foreign	2,298	1,118	1,024
Deferred Income Tax Expense (Benefit), Total	45,868	27,338	(47,762)
Income Tax Expense (Benefit), Total	$ 87,299	$ 54,474	$ (2,136)