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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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