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SELECTED QUARTERLY FINANCIAL DATA (UNAUDITED) (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Selected quarterly financial data [Abstract]                      
Net sales $ 196,164 $ 192,722 $ 171,114 $ 186,090 $ 182,307 $ 172,677 $ 151,519 $ 163,569 $ 746,090 $ 670,073 $ 620,903
Gross profit 106,000 103,877 91,311 100,309 96,271 90,673 79,749 85,341 401,496 352,035 320,716
Credit service charges 79 78 76 86 77 69 71 76 320 293 460
Income (loss) before taxes 15,783 15,388 7,866 13,450 10,093 5,636 3,766 4,021 52,487 23,516 4,603
Net income (loss) 9,681 9,494 4,830 8,260 6,779 3,314 2,361 2,457 32,265 14,911 15,463
Diluted net earnings (loss) per share                      
Benefit from release of reserve for the valuation allowance on deferred tax assets       800         1,363 1,207 14,121
Per share impact of releasing the reserves for the valuation allowance (in dollars per share)       $ 0.02              
Common Stock [Member]
                      
Selected quarterly financial data [Abstract]                      
Net income (loss)                 28,759 13,199 13,249
Basic net earnings (loss) per share                      
Common Stock (in dollars per share) $ 0.43 $ 0.42 $ 0.22 $ 0.37 $ 0.31 $ 0.15 $ 0.11 $ 0.11 $ 1.45 $ 0.69 $ 0.71
Diluted net earnings (loss) per share                      
Common Stock (in dollars per share) $ 0.42 $ 0.42 $ 0.21 $ 0.36 $ 0.30 $ 0.15 $ 0.11 $ 0.11 $ 1.41 $ 0.67 $ 0.70
Class A Common Stock [Member]
                      
Selected quarterly financial data [Abstract]                      
Net income (loss)                 $ 3,506 $ 1,712 $ 2,214
Basic net earnings (loss) per share                      
Common Stock (in dollars per share) $ 0.41 $ 0.40 $ 0.20 $ 0.35 $ 0.28 $ 0.14 $ 0.10 $ 0.11 $ 1.37 $ 0.58 $ 0.67
Diluted net earnings (loss) per share                      
Common Stock (in dollars per share) $ 0.41 $ 0.40 $ 0.20 $ 0.34 $ 0.29 $ 0.14 $ 0.10 $ 0.11 $ 1.35 $ 0.59 $ 0.67