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PROVISIONS FOR CONTINGENCIES - Reserve Roll Forward (Details) - USD ($)
$ in Thousands
 1 Months Ended 12 Months Ended
Nov. 06, 2019
May 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Reconciliation of changes in other provisions [abstract]          
Balance at beginning of year     $ 2,862    
Balance at end of year     2,602 $ 2,862  
Reserve for labor claims          
Reconciliation of changes in other provisions [abstract]          
Balance at beginning of year     678 49 $ 1,138
Additions     907 926 187
Recovery     (1,247) 0 0
Utilization of provision for contingencies     (99) (222) (1,288)
Foreign exchange     (148) (75) 12
Balance at end of year     91 678 49
Reserve for regulatory claims          
Reconciliation of changes in other provisions [abstract]          
Balance at beginning of year     2,184 1,130 807
Additions     219 1,144 340
Recovery     (879) 0 0
Utilization of provision for contingencies     (95) 0 (32)
Foreign exchange     82 (90) 15
Balance at end of year     1,511 2,184 1,130
Reserve for commercial claims          
Reconciliation of changes in other provisions [abstract]          
Balance at beginning of year     0 0 0
Additions     1,000 0 0
Balance at end of year     $ 1,000 $ 0 $ 0
Reserve for commercial claims | Sistemas Colombia S.A.S.          
Reconciliation of changes in other provisions [abstract]          
Additions $ 2,100 $ 1,400