Income Taxes (Components Of Provision For Income Taxes) (Details) (USD $)	3 Months Ended	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income Tax Disclosure [Abstract]
Current tax provision, Federal		$ 34,387,000	$ 123,406,000	$ 86,002,000
Current tax provision, State		7,850,000	28,657,000	21,803,000
Current tax provision, Foreign		1,162,000	(70,000)	0
Total current		43,399,000	151,993,000	107,805,000
Deferred tax provision, Federal		(26,903,000)	(14,008,000)	(1,615,000)
Deferred tax provision, State		(3,168,000)	(4,589,000)	653,000
Total deferred		(30,071,000)	(18,597,000)	(962,000)
Provision for income taxes	$ 21,616,000	$ 13,328,000	$ 133,396,000	$ 106,843,000