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INCOME TAXES - Schedule of effective tax rate (Details)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2015
INCOME TAXES      
U.S. federal statutory income tax rate 21.00% 21.00% 35.00%
State income taxes, net of federal tax benefit 1.80% 4.30%  
Non-taxable municipal bond interest 1.30% (0.40%)  
Net Operating Loss Carryback Under the CARES Act 10.40%    
Foreign income tax rate differences (24.30%)    
Reversal of deferred tax assets on foreign net operating losses (28.40%)    
Tax settlements   (1.20%)  
Share-based compensation (1.00%) 0.20%  
Other (1.10%) (1.00%)  
Effective tax rate (20.30%) 22.90%