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Income Taxes (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Current:
Federal	$ 12,051	$ 12,766	$ 17,441	$ 21,914
State	2,198	3,123	3,273	5,669
Total Current	14,249	15,889	20,714	27,583
Deferred:
Federal	1,049	1,414	2,220	1,378
State	153	189	319	188
Total Deferred	1,202	1,603	2,539	1,566
Provisions for income taxes	$ 15,451	$ 17,492	$ 23,253	$ 29,149

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