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QUARTERLY FINANCIAL INFORMATION (UNAUDITED) (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
QUARTERLY FINANCIAL INFORMATION (UNAUDITED)                      
Net Sales $ 203,140 $ 195,467 $ 222,346 $ 197,213 $ 179,968 $ 195,690 $ 176,888 $ 159,160 $ 818,166 $ 711,706 $ 615,101
Operating Income 15,174 11,293 14,245 12,382 11,329 12,026 11,601 8,838      
Net Income $ 11,692 $ 8,076 $ 10,683 $ 8,660 $ 10,799 $ 8,677 $ 7,600 $ 6,670 $ 39,111 $ 33,746 $ 23,016
Basic Income Per Share (in dollars per share) $ 1.03 $ 0.71 $ 0.94 $ 0.76 $ 0.95 $ 0.76 $ 0.67 $ 0.59 $ 3.43 $ 2.96 $ 2.02
Diluted Income Per Share (in dollars per share) 1.03 0.71 0.94 0.76 0.95 0.76 0.67 0.59 3.43 2.96 2.02
Cash Dividends Declared Per Share (in dollars per share) $ 0.18 $ 0.18 $ 0.18 $ 0.18 $ 0.18 $ 0.18 $ 0.18 $ 0.18 $ 0.72 $ 0.72 $ 0.72