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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, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Selected quarterly financial data [Abstract]                      
Net sales $ 182,307 $ 172,677 $ 151,519 $ 163,569 $ 168,259 $ 155,379 $ 143,094 $ 154,171 $ 670,073 $ 620,903 $ 620,331
Gross profit 96,271 90,673 79,749 85,341 87,921 80,438 73,406 78,951 352,035 320,716 318,767
Credit service charges 77 69 71 76 98 109 119 134 293 460 717
Income (loss) before taxes 10,093 5,636 3,766 4,021 6,061 87 (1,018) (527) 23,516 4,603 8,673
Net income (loss) 6,779 3,314 2,361 2,457 16,958 118 (942) (671) 14,911 15,463 8,444
Diluted net earnings per share                      
Benefit from release of reserve for the valuation allowance on deferred tax assets 14,100               (1,207) (14,121) (3,133)
Per share impact of releasing the reserves for the valuation allowance (in dollars per share) $ 0.64                    
Common Stock [Member]
                     
Selected quarterly financial data [Abstract]                      
Net income (loss)                 13,199 13,249 7,138
Basic net earnings per share                      
Common Stock (in dollars per share) $ 0.31 $ 0.15 $ 0.11 $ 0.11 $ 0.78 $ 0.01 $ (0.04) $ (0.03) $ 0.69 $ 0.71 $ 0.39
Diluted net earnings per share                      
Common Stock (in dollars per share) $ 0.30 $ 0.15 $ 0.11 $ 0.11 $ 0.76 $ 0.01 $ (0.04) $ (0.03) $ 0.67 $ 0.70 $ 0.38
Class A Common Stock [Member]
                     
Selected quarterly financial data [Abstract]                      
Net income (loss)                 $ 1,712 $ 2,214 $ 1,306
Basic net earnings per share                      
Common Stock (in dollars per share) $ 0.28 $ 0.14 $ 0.10 $ 0.11 $ 0.74 $ 0.01 $ (0.04) $ (0.03) $ 0.58 $ 0.67 $ 0.37
Diluted net earnings per share                      
Common Stock (in dollars per share) $ 0.29 $ 0.14 $ 0.10 $ 0.11 $ 0.73 $ 0.01 $ (0.04) $ (0.03) $ 0.59 $ 0.67 $ 0.36