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Quarterly Financial Data (Unaudited) Quarterly Financial Data (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]
Revenues	$ 90,088	$ 84,393	$ 77,477	$ 77,490	$ 71,149	$ 66,125	$ 67,752	$ 69,081	$ 329,448	$ 274,107	$ 267,992
Gross profit	29,718	27,874	25,160	23,171	20,679	18,056	19,250	21,600	105,923	79,585	75,947
Net income from continuing operations	$ 8,365	$ 5,525	$ 6,397	$ (4,197)	$ 2,569	$ 577	$ 4,862	$ 6,525	$ 16,090	$ 14,533	$ 11,645
Basic earnings per common share (in dollars per share)	$ 0.47	$ 0.31	$ 0.36	$ (0.23)	$ 0.14	$ 0.03	$ 0.27	$ 0.36	$ 0.90	$ 0.81	$ 0.64
Diluted earnings per common share (in dollars per share)	$ 0.46	$ 0.31	$ 0.36	$ (0.23)	$ 0.14	$ 0.03	$ 0.27	$ 0.36	$ 0.89	$ 0.80	$ 0.63

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