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RESTATEMENT - Impact of Restatement Adjustment on Net Income, Comprehensive Income and Retained Earnings (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Jan. 01, 2018
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Error Corrections and Prior Period Adjustments Restatement [Line Items]                                  
Net income (loss)     $ (3,200) $ (34,800) $ 2,400 $ 6,000 $ 1,300 $ 13,800 $ 14,000 $ 7,600 $ 12,300 $ 8,800 $ 11,900 $ 5,200 $ (29,617) $ 36,765 $ 38,234
Retained earnings $ 186,078 $ 140,474 186,078       215,664       178,729       186,078 215,664 178,729
Cost of Product Sold                             728,070 915,062 882,866
Earnings from Continuing Operations Before Non-Controlling Interest and Income Taxes                             (48,313) 47,959 52,341
Total income tax expense (benefit)                             (18,696) 11,194 14,107
Cumulative translation adjustments, net of tax                             1,941 (687) 224
Comprehensive income (loss)                             (27,676) 36,078 38,458
As Reported                                  
Error Corrections and Prior Period Adjustments Restatement [Line Items]                                  
Net income (loss)     (2,000) $ (34,700) $ 2,100 $ 5,700 2,100 $ 13,200 $ 13,400 $ 7,300 11,100 $ 8,400 $ 11,600 $ 4,500 (29,074) 35,775 35,521
Retained earnings 176,637 134,193 $ 176,637       $ 205,680       $ 169,735       176,637 205,680 169,735
Cost of Product Sold                             725,997 919,965 883,989
Earnings from Continuing Operations Before Non-Controlling Interest and Income Taxes                             (47,515) 46,669 48,706
Total income tax expense (benefit)                             (18,441) 10,894 13,185
Adjustments                                  
Error Corrections and Prior Period Adjustments Restatement [Line Items]                                  
Total income tax expense (benefit)   (2,145)                         255 (300) (922)
Cumulative translation adjustments, net of tax $ (1,800)                                
Adjustments | Unvouchered Purchase Orders                                  
Error Corrections and Prior Period Adjustments Restatement [Line Items]                                  
Cost of Product Sold   7,818                         (1,874) 3,737 2,411
Adjustments | Landed cost inventory adjustment                                  
Error Corrections and Prior Period Adjustments Restatement [Line Items]                                  
Cost of Product Sold   218                         (1,366) 623 525
Adjustments | Obsolete inventory reserve adjustments                                  
Error Corrections and Prior Period Adjustments Restatement [Line Items]                                  
Cost of Product Sold   0                         1,160 (1,160) 0
Adjustments | Direct shipment cut off adjustment                                  
Error Corrections and Prior Period Adjustments Restatement [Line Items]                                  
Cost of Product Sold   390                         7 (635) 699
Adjustments | Cut-off for credit card payment accruals                                  
Error Corrections and Prior Period Adjustments Restatement [Line Items]                                  
Earnings from Continuing Operations Before Non-Controlling Interest and Income Taxes   0                         581 (581) 0
Adjustments | Sales Tax Payable Accruals                                  
Error Corrections and Prior Period Adjustments Restatement [Line Items]                                  
Earnings from Continuing Operations Before Non-Controlling Interest and Income Taxes   $ 0                         $ 694 $ (694) $ 0