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SELECTED QUARTERLY FINANCIAL DATA (UNAUDITED) (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
Selected quarterly financial data [Abstract]                      
Net sales $ 220,595 $ 211,690 $ 194,774 $ 194,511 $ 215,886 $ 209,921 $ 187,732 $ 191,331 $ 821,571 $ 804,870 $ 768,409
Gross profit 121,020 113,737 104,160 104,419 116,205 111,742 100,182 102,647 443,337 430,776 412,366
Credit service charges 56 54 54 65 73 71 69 72 229 286 298
Income before taxes 17,347 12,125 8,762 7,587 15,093 12,414 7,839 9,928 45,821 45,275 25,257
Net income $ 10,947 $ 7,336 $ 5,374 $ 4,669 $ 9,181 $ 7,655 $ 4,833 $ 6,119 28,356 27,789 8,589
Common Stock [Member]                      
Selected quarterly financial data [Abstract]                      
Net income                 $ 2,551 $ 2,436 $ 732
Basic net earnings (loss) per share [Abstract]                      
Common stock (in dollars per share) $ 0.52 $ 0.35 $ 0.25 $ 0.21 $ 0.42 $ 0.34 $ 0.21 $ 0.27 $ 1.32 $ 1.24 $ 0.38
Diluted net earnings (loss) per share [Abstract]                      
Common stock (in dollars per share) 0.51 0.34 0.24 0.21 0.41 0.34 0.21 0.27 $ 1.30 $ 1.22 $ 0.37
Class A Common Stock [Member]                      
Selected quarterly financial data [Abstract]                      
Net income                 $ 2,551 $ 2,436 $ 732
Basic net earnings (loss) per share [Abstract]                      
Common stock (in dollars per share) 0.50 0.33 0.24 0.20 0.40 0.32 0.20 0.26 $ 1.27 $ 1.18 $ 0.33
Diluted net earnings (loss) per share [Abstract]                      
Common stock (in dollars per share) $ 0.51 $ 0.33 $ 0.23 $ 0.20 $ 0.39 $ 0.32 $ 0.20 $ 0.25 $ 1.27 $ 1.17 $ 0.33