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STOCK-BASED COMPENSATION - Vesting Conditions (Details) - shares
3 Months Ended 9 Months Ended
Sep. 30, 2021
Mar. 31, 2021
Sep. 30, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Granted, Number of share of restricted stock (shares)     158,171
Restricted stock units, type 1      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Granted, Number of share of restricted stock (shares)     66,220
Target, Regional adjusted EBITDA, percentage 70.00%   70.00%
Target, Group adjusted EBITDA, percentage 30.00%   30.00%
Restricted stock units, type 1 | Performance Conditions, 2020      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Target, Group adjusted EBITDA, percentage 75.00%   75.00%
Target, Corporate costs , percentage 25.00%   25.00%
Restricted stock units, type 1 | Performance Conditions, 2021      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Target, Group adjusted EBITDA, percentage 100.00%   100.00%
Restricted stock units, type 1 | First Anniversary      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Granted, Number of share of restricted stock (shares)   53,075  
Vesting rights, percentage     33.00%
Restricted stock units, type 1 | Second Anniversary      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting rights, percentage     33.00%
Restricted stock units, type 1 | Third Anniversary      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting rights, percentage     34.00%
Restricted stock units, type 2      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Granted, Number of share of restricted stock (shares)     60,451
Restricted stock units, type 2 | First Anniversary      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting rights, percentage     66.60%
Restricted stock units, type 2 | Second Anniversary      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Granted, Number of share of restricted stock (shares)   73,596  
Vesting rights, percentage     16.70%
Restricted stock units, type 2 | Third Anniversary      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting rights, percentage     16.70%
Restricted stock units, time      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Granted, Number of share of restricted stock (shares) 6,000   31,500
Restricted stock units, time | Performance Conditions, 2021 | Coit Staffing, Inc.      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Target, Group adjusted EBITDA, percentage 100.00%   100.00%