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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, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Selected Unaudited Quarterly Information                      
Revenue $ 43,420 $ 41,775 $ 38,654 $ 38,953 $ 37,823 $ 34,443 $ 34,486 $ 31,581 $ 162,802 $ 138,333 $ 115,802
Income from continuing operations 6,012 5,573 5,701 6,055 5,656 3,856 5,022 4,848 23,341 19,382 17,729
Income from discontinued operations (552) (14,571) (268) (317) (594) (542) 5,359 19,919 (15,708) 24,142 4,364
Net income $ 5,460 $ (8,998) $ 5,433 $ 5,738 $ 5,062 $ 3,314 $ 10,381 $ 24,767 $ 7,633 $ 43,524 $ 22,093
Basic and diluted net income per share (in dollars per share) $ 0.07 $ (0.11) $ 0.07 $ 0.07 $ 0.06 $ 0.04 $ 0.13 $ 0.30 $ 0.09 $ 0.53 $ 0.28
Weighted average number of shares outstanding, basic and diluted (in shares) 82,937 82,937 82,937 82,937 82,937 81,600 81,437 81,437 82,937 81,857 79,826