Income Taxes (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Dec. 31, 2011
Income Tax Disclosure [Abstract]
Percentage of taxable income required to be distributed to shareholders	90.00%
State tax expense	$ 477	$ 804
Income tax benefit	(228)	(1,770)
Current portion of income tax provision (benefit)	(3,051)	1,512
Deferred portion of income tax provision (benefit)	2,823	258
Deferred tax asset	$ 8,240		$ 8,012