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 |
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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 | |||||
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