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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Post-employment Benefits and Stock-based Compensation (Details)
12 Months Ended
Dec. 31, 2020
item
Post employment benefits  
Contribution under supplemental plan (as a percent) 10.00%
Minimum number of years of service for retirement program 10 years
Minimum age limit to be eligible for retirement program (in years) 57 years
Stock-based Compensation  
Contribution by directors (excluding non-executive directors), officers and employees under ISPP (as a percent) 10.00%
Contribution by company under ISPP to participants (as a percent) 50.00%
Mexico Plans  
Post employment benefits  
Minimum number of years of service for retirement program 15 years
Minimum age limit to be eligible for retirement program (in years) 60 years
Number of defined benefit retirement plans 3