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SUMMARY OF SIGNIFICANT ACCOUNTING AND BUSINESS POLICIES - Variable Interest Entity (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Risks and Uncertainties [Abstract]      
Assets $ 868,131 $ 789,088 $ 703,741
Fixed assets 56,899 63,703  
Provision for income taxes (benefit) $ (18,696) 11,194 $ 14,107
Employees      
Risks and Uncertainties [Abstract]      
Ownership percentage in VIE 52.50%    
Variable Interest Entity, Primary Beneficiary      
Risks and Uncertainties [Abstract]      
Ownership percentage in VIE 47.50%    
Assets $ 4,800    
Fixed assets 3,400    
Increase (decrease) in cost of sales 800 (400)  
Provision for income taxes (benefit) $ (116) $ (83)