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SELECTED QUARTERLY FINANCIAL DATA (UNAUDITED) (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
Selected quarterly financial data [Abstract]                      
Net sales $ 214,962 $ 207,647 $ 196,829 $ 200,427 $ 220,595 $ 211,690 $ 194,774 $ 194,511 $ 819,866 $ 821,571 $ 804,870
Gross profit 116,193 112,015 107,119 109,596 121,020 113,737 104,160 104,419 444,923 443,337 430,776
Credit service charges 35 38 42 45 56 54 54 65 161 229 286
Income before taxes 14,070 9,719 9,694 9,740 17,347 12,125 8,762 7,587 43,223 45,821 45,275
Net income 2,921 $ 5,983 $ 6,185 $ 5,986 $ 10,947 $ 7,336 $ 5,374 $ 4,669 21,075 $ 28,356 $ 27,789
Diluted net earnings per share [Abstract]                      
Other income 1,900                    
Insurance recoveries 1,300                    
Additional provision for income tax expense $ 5,900               $ 10,639    
Common Stock [Member]                      
Basic net earnings per share [Abstract]                      
Common stock (in dollars per share) $ 0.14 $ 0.28 $ 0.29 $ 0.28 $ 0.52 $ 0.35 $ 0.25 $ 0.21 $ 1.00 $ 1.32 $ 1.24
Diluted net earnings per share [Abstract]                      
Common stock (in dollars per share) 0.13 0.28 0.29 0.28 0.51 0.34 0.24 0.21 0.98 1.30 1.22
Class A Common Stock [Member]                      
Basic net earnings per share [Abstract]                      
Common stock (in dollars per share) 0.13 0.27 0.28 0.27 0.50 0.33 0.24 0.20 0.95 1.27 1.18
Diluted net earnings per share [Abstract]                      
Common stock (in dollars per share) $ 0.13 $ 0.27 $ 0.27 $ 0.27 $ 0.51 $ 0.33 $ 0.23 $ 0.20 $ 0.94 $ 1.27 $ 1.17