Quarterly Financial Data (Unaudited) Quarterly Financial Data (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	12 Months Ended
Dec. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Quarterly Financial Information Disclosure [Abstract]
Revenues	$ 61,610	$ 59,419	$ 58,378	$ 59,261	$ 63,253	$ 54,549	$ 56,504	$ 55,652	$ 242,502	$ 226,124	$ 213,074
Gross profit	19,691	18,927	17,360	18,248	22,209	15,077	17,989	18,015	77,508	70,008	64,285
Net income from continuing operations	5,434	5,367	4,444	4,557	6,418	4,565	3,883	1,631	20,853	15,446	15,120
Income from discontinued operations, net of tax		11				431	(637)	587	0	392	4,176
Preferred stock dividend									0	0	(4)
Net income	$ 5,434	$ 5,378	$ 4,444	$ 4,557	$ 6,418	$ 4,996	$ 3,246	$ 2,218	$ 20,853	$ 15,838	$ 19,292
Basic earnings per common share (in dollars per share)	$ 0.32	$ 0.29	$ 0.25	$ 0.25	$ 0.35	$ 0.27	$ 0.18	$ 0.12	$ 1.16	$ 0.86	$ 1.06
Diluted earnings per common share (in dollars per share)	$ 0.31	$ 0.29	$ 0.24	$ 0.24	$ 0.34	$ 0.26	$ 0.17	$ 0.12	$ 1.12	$ 0.85	$ 1.00

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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Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity.

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Amount of income (loss) from continuing operations attributable to the parent. Also defined as revenue less expenses and taxes from ongoing operations before extraordinary items but after deduction of those portions of income or loss from continuing operations that are allocable to noncontrolling interests.

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Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period).

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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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