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PROVISIONS FOR CONTINGENCIES - Reserve for Lawsuit Claims (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of contingent liabilities [line items]        
Provisions for contingencies $ 2,602 $ 2,862    
Reserve for labor claims        
Disclosure of contingent liabilities [line items]        
Provisions for contingencies 91 678 $ 49 $ 1,138
Reserve for commercial claims        
Disclosure of contingent liabilities [line items]        
Provisions for contingencies 1,000 0 0 0
Reserve for regulatory claims        
Disclosure of contingent liabilities [line items]        
Provisions for contingencies $ 1,511 $ 2,184 $ 1,130 $ 807