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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, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract]
Revenues	$ 65,076	$ 61,054	$ 63,852	$ 68,157	$ 62,864	$ 60,140	$ 61,865	$ 63,331	$ 258,139	$ 248,200	$ 242,502
Gross profit	19,560	15,480	18,667	23,092	21,312	18,228	18,807	21,303	76,799	79,650	77,508
Net income from continuing operations	$ 22,661	$ 3,038	$ 4,410	$ 7,084	$ 4,127	$ 5,683	$ 5,200	$ 4,571	$ 37,193	$ 19,581	$ 20,853
Basic earnings per common share (in dollars per share)	$ 1.41	$ 0.18	$ 0.26	$ 0.42	$ 0.25	$ 0.34	$ 0.31	$ 0.27	$ 2.25	$ 1.18	$ 1.16
Diluted earnings per common share (in dollars per share)	$ 1.31	$ 0.17	$ 0.24	$ 0.39	$ 0.22	$ 0.33	$ 0.30	$ 0.27	$ 2.09	$ 1.12	$ 1.12

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- Definition

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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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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Amount after tax of income (loss) from continuing operations attributable to the parent.

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Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

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