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Income Taxes (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Current:
Federal	$ 33,006	$ 13,723	$ 2,456
State	4,514	3,754	1,337
Total Current	37,520	17,477	3,793
Deferred:
Federal	7,543	1,602	9,611
State	1,145	708	1,620
Total Deferred	8,688	2,310	11,231
Provisions for income taxes	$ 46,208	$ 19,787	$ 15,024

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