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Income Taxes (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Current:
Federal	$ 5,390	$ 9,148
State	1,075	2,546
Total Current	6,465	11,694
Deferred:
Federal	1,171	(36)
State	166	(1)
Total Deferred	1,337	(37)
Provisions for income taxes	$ 7,802	$ 11,657

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