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Selected Unaudited Quarterly Information (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Selected Unaudited Quarterly Information
Revenue	$ 38,094	$ 34,716	$ 34,762	$ 31,914	$ 30,555	$ 29,871	$ 27,611	$ 29,129	$ 139,486	$ 117,166	$ 121,143
Income from continuing operations	5,308	3,453	4,664	4,555	3,304	4,000	4,536	4,885	17,980	16,725	26,957
Income from discontinued operations	(246)	(139)	5,717	20,212	2,515	758	1,418	677	3,605	5,368	491
Net income	$ 5,062	$ 3,314	$ 10,381	$ 24,767	$ 5,819	$ 4,758	$ 5,954	$ 5,562	$ 43,524	$ 22,093	$ 27,872
Basic and diluted net income per share (in dollars per share)	$ 0.06	$ 0.04	$ 0.13	$ 0.30	$ 0.07	$ 0.06	$ 0.07	$ 0.07	$ 0.53	$ 0.28	$ 0.38
Weighted average number of shares outstanding - basic	82,937	81,600	81,437	81,437	80,187	79,751	79,681	79,681	81,857	79,826	73,001
Weighted average number of shares outstanding - diluted	82,937	81,600	81,437	81,437	80,187	79,751	79,681	79,681	81,857	79,826	73,001

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