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Income Taxes (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Current:
Federal	$ 36,028	$ 53,344	$ 70,967
State	8,333	12,081	14,815
Total current	44,361	65,425	85,782
Deferred:
Federal	(608)	4,760	(71)
State	(708)	(707)	28
Total deferred	(1,316)	4,053	(43)
Total provision for income taxes	$ 43,045	$ 69,478	$ 85,739

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