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Quarterly Results (unaudited) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2021
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Quarterly Financial Information Disclosure [Abstract]                      
Revenue $ 62,604 $ 62,244 $ 60,700 $ 59,691 $ 58,132 $ 55,173 $ 54,336 $ 53,134 $ 245,239 $ 220,775 $ 206,862
Operating income (loss) (7,901) 851 2,390 2,230 1,529 (121) (2,361) (1,648) (2,430) (2,601) (1,342)
Income from continuing operations (3,137) 6,495 1,626 2,945 1,539 985 (893) (55) 7,929 1,576 1,932
Income (loss) from discontinued operations, net of tax (4,965) (406) 51,566 48,472              
Income from discontinued operations, net of tax         47,675 33,509 29,784 13,129 990,902 124,097 53,568
Gain on the sale of discontinued operations, net of tax 9,503 886,732 0 0         896,235 0 0
Net income $ 1,401 $ 892,821 $ 53,192 $ 51,417 $ 49,214 $ 34,494 $ 28,891 $ 13,074 $ 998,831 $ 125,673 $ 55,500
Basic - Income from continuing operations (in dollars per share) $ (0.06) $ 0.13 $ 0.03 $ 0.06 $ 0.03 $ 0.02 $ (0.02) $ 0 $ 0.16 $ 0.03 $ 0.04
Basic - Income from discontinued operations, net of tax (in dollars per share) 0.09 17.73 1.04 0.97 0.96 0.67 0.60 0.26 19.81 2.49 1.07
Basic net income per share (in dollars per share) 0.03 17.86 1.07 1.03 0.99 0.69 0.58 0.26 19.97 2.52 1.11
Diluted - Income from continuing operations (in dollars per share) (0.06) 0.13 0.03 0.06 0.03 0.02 (0.02) 0 0.16 0.03 0.04
Diluted - Income from discontinued operations, net of tax (in dollars per share) 0.09 17.68 1.03 0.97 0.95 0.67 0.60 0.26 19.76 2.48 1.07
Diluted net income per share (in dollars per share) $ 0.03 $ 17.81 $ 1.06 $ 1.03 $ 0.98 $ 0.69 $ 0.58 $ 0.26 $ 19.92 $ 2.51 $ 1.11