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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, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]
Revenues	$ 71,149	$ 66,125	$ 67,752	$ 69,081	$ 66,517	$ 64,241	$ 63,847	$ 73,387	$ 274,107	$ 267,992	$ 258,139
Gross profit	20,679	18,056	19,250	21,600	17,820	17,114	16,825	24,188	79,585	75,947	76,799
Net income from continuing operations	$ 2,569	$ 577	$ 4,862	$ 6,525	$ (2,658)	$ 2,200	$ 2,747	$ 9,356	$ 14,533	$ 11,645	$ 37,193
Basic earnings per common share (in dollars per share)	$ 0.14	$ 0.03	$ 0.27	$ 0.36	$ (0.14)	$ 0.11	$ 0.15	$ 0.58	$ 0.81	$ 0.64	$ 2.25
Diluted earnings per common share (in dollars per share)	$ 0.14	$ 0.03	$ 0.27	$ 0.36	$ (0.14)	$ 0.11	$ 0.15	$ 0.52	$ 0.80	$ 0.63	$ 2.09

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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