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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, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract]
Revenues	$ 66,517	$ 64,241	$ 63,847	$ 73,387	$ 65,076	$ 61,054	$ 63,852	$ 68,157	$ 267,992	$ 258,139	$ 248,200
Gross profit	17,820	17,114	16,825	24,188	19,560	15,480	18,667	23,092	75,947	76,799	79,650
Net income from continuing operations	$ (2,658)	$ 2,200	$ 2,747	$ 9,356	$ 22,661	$ 3,038	$ 4,410	$ 7,084	$ 11,645	$ 37,193	$ 19,581
Basic earnings per common share (in dollars per share)	$ (0.14)	$ 0.11	$ 0.15	$ 0.58	$ 1.41	$ 0.18	$ 0.26	$ 0.42	$ 0.64	$ 2.25	$ 1.18
Diluted earnings per common share (in dollars per share)	$ (0.14)	$ 0.11	$ 0.15	$ 0.52	$ 1.31	$ 0.17	$ 0.24	$ 0.39	$ 0.63	$ 2.09	$ 1.12

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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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