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QUARTERLY FINANCIAL INFORMATION (UNAUDITED) - Summary of the unaudited quarterly financial information (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]
Net Sales	$ 159,716	$ 153,363	$ 153,089	$ 148,933	$ 148,594	$ 147,597	$ 156,113	$ 148,815	$ 615,101	$ 601,119	$ 540,966
Operating Income	9,582	7,070	8,537	6,351	7,661	8,621	10,719	4,960	31,540	31,961
Net Income	$ 9,296	$ 4,456	$ 5,425	$ 3,839	$ 4,453	$ 5,522	$ 6,587	$ 3,360	$ 23,016	$ 19,922	$ 15,976
Basic Income Per Share (in dollars per share)	$ 0.81	$ 0.39	$ 0.48	$ 0.34	$ 0.39	$ 0.49	$ 0.58	$ 0.30	$ 2.02	$ 1.76	$ 1.41
Diluted Income Per Share (in dollars per share)	0.81	0.39	0.48	0.34	0.38	0.49	0.58	0.30	2.02	1.75	1.41
Cash Dividends Declared Per Share (in dollars per share)	$ 0.18	$ 0.18	$ 0.18	$ 0.18	$ 0.17	$ 0.17	$ 0.17	$ 0.17	$ 0.72	$ 0.68	$ 0.64

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Aggregate dividends declared during the period for each share of common stock outstanding.

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