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INCOME TAXES - Valuation Allowances (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Operating Loss Carryforwards [Line Items]    
Deferred Tax Assets, Valuation Allowance $ 46,702 $ 76,206
Capital loss carryforwards 200  
Interest expense limitation carryforwards 30,500  
Federal net operating loss carry forwards, have no expiration period 8,000  
Income Tax Holiday, Aggregate Dollar Amount $ 13,000 $ 4,000
Income Tax Holiday, Income Tax Benefits Per Share $ 0.34 $ 0.12
Decrease in valuation allowance $ 29,500  
Undistributed earnings of foreign subsidiaries 58,900  
Domestic Tax Authority [Member]    
Operating Loss Carryforwards [Line Items]    
Deferred Tax Assets, Valuation Allowance 4,200  
Operating Loss Carryforwards 70,300 $ 70,300
Tax Credit Carryforward, Amount 1,300  
Foreign Tax Authority [Member]    
Operating Loss Carryforwards [Line Items]    
Deferred Tax Assets, Valuation Allowance 42,500  
Operating Loss Carryforwards 129,600  
State Taxing Authority [Member]    
Operating Loss Carryforwards [Line Items]    
Operating Loss Carryforwards 117,700  
Tax Credit Carryforward, Amount $ 1,700