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Quarterly Results (unaudited) (Quarterly Financial Information) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Quarterly Results (unaudited) [Abstract]
Revenue	$ 62,467	$ 68,578	$ 71,144	$ 72,345	$ 61,312	$ 65,936	$ 72,161	$ 73,364	$ 274,534	$ 272,773	$ 285,285
Gross profit	47,082	52,163	53,225	53,194	45,218	49,160	53,167	53,770	205,664	201,315	209,207
Income from continuing operations before income taxes	6,660	9,011	5,092	6,359	5,942	8,109	8,828	6,792	27,122	29,671	31,693
Income from continuing operations	4,113	6,065	3,397	4,260	3,902	5,402	5,847	4,416	17,835	19,567	21,029
Net income	$ 4,113	$ 6,065	$ 3,397	$ 4,260	$ 3,860	$ 5,506	$ 6,248	$ 4,444	$ 17,835	$ 20,058	$ 13,181
Earnings per share from continuing operations- diluted	$ 0.34	$ 0.51	$ 0.29	$ 0.36	$ 0.33	$ 0.45	$ 0.48	$ 0.36	$ 1.49	$ 1.62	$ 1.65
Earnings (loss) per share- diluted	$ 0.34	$ 0.51	$ 0.29	$ 0.36	$ 0.33	$ 0.46	$ 0.51	$ 0.36	$ 1.49	$ 1.66	$ 1.03

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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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