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NATURE OF OPERATIONS - Condensed Consolidated Cash Flows (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Operating activities:    
Net income $ 19,063 $ 15,846
Accounts payable (2,560) 934
Accrued liabilities 6,412 1,449
Net cash used in operating activities (5,266) $ 3,341
Error corrections in accounts payable and cost of goods sold    
Operating activities:    
Net income 19,063  
Accounts payable (2,560)  
Accrued liabilities 6,412  
Net cash used in operating activities (5,266)  
As Originally Reported | Error corrections in accounts payable and cost of goods sold    
Operating activities:    
Net income 17,619  
Accounts payable (691)  
Accrued liabilities 5,987  
Net cash used in operating activities (5,266)  
Adjustments | Error corrections in accounts payable and cost of goods sold    
Operating activities:    
Net income 1,444  
Accounts payable (1,869)  
Accrued liabilities $ 425