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INCOME TAXES - Valuation Allowances (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]    
Valuation allowance, Beginning Balance $ 131,554  
Valuation allowance, additions 7,140 $ 11,459
Valuation allowance, deductions (1,659) (15,669)
Valuation allowance, Ending Balance 137,035 131,554
Valuation Allowance of Deferred Tax Assets    
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]    
Valuation allowance, Beginning Balance 131,554 135,764
Valuation allowance, Ending Balance $ 137,035 $ 131,554