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SELECTED QUARTERLY FINANCIAL DATA (UNAUDITED) (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Selected quarterly financial data [Abstract]                      
Net sales $ 215,886 $ 209,921 $ 187,732 $ 191,331 $ 212,999 $ 198,541 $ 175,132 $ 181,737 $ 804,870 [1] $ 768,409 [1] $ 746,090 [1]
Gross profit 116,205 111,742 100,182 102,647 114,156 106,203 94,144 97,862 430,776 412,366 401,496
Credit service charges 73 71 69 72 75 72 71 81 286 298 320
Income before taxes 15,093 12,414 7,839 9,928 (4,978) 12,468 7,812 9,956 45,275 25,257 52,487
Net income $ 9,181 $ 7,655 $ 4,833 $ 6,119 (10,192) $ 7,824 $ 4,829 $ 6,129 $ 27,789 $ 8,589 $ 32,265
Diluted net earnings (loss) per share [Abstract]                      
Settlement expense of defined benefit pension plan         $ 21,600            
Per share impact of settlement expense of defined benefit pension plan (in dollars per share)         $ 0.90            
Common Stock [Member]                      
Basic net earnings (loss) per share [Abstract]                      
Common stock (in dollars per share) $ 0.42 $ 0.34 $ 0.21 $ 0.27 (0.45) $ 0.35 $ 0.21 $ 0.27 $ 1.24 $ 0.38 $ 1.45
Diluted net earnings (loss) per share [Abstract]                      
Common stock (in dollars per share) 0.41 0.34 0.21 0.27 (0.45) 0.34 0.21 0.27 $ 1.22 $ 0.37 $ 1.41
Class A Common Stock [Member]                      
Selected quarterly financial data [Abstract]                      
Net income                 $ 2,436 $ 732 $ 3,506
Basic net earnings (loss) per share [Abstract]                      
Common stock (in dollars per share) 0.40 0.32 0.20 0.26 (0.43) 0.33 0.20 0.26 $ 1.18 $ 0.33 $ 1.37
Diluted net earnings (loss) per share [Abstract]                      
Common stock (in dollars per share) $ 0.39 $ 0.32 $ 0.20 $ 0.25 $ (0.43) $ 0.33 $ 0.20 $ 0.26 $ 1.17 $ 0.33 $ 1.35
[1] Includes delivery charges and product protection.