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SHAREHOLDERS EQUITY - Stock based compensation - Time Vesting Units (Details) - Time Vesting Units - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Service period (in years)     5 years  
Weighted average grant date fair value     $ 13.80  
Granted (in shares)     71,127  
Stock-based compensation expense $ 0.3 $ 0.1 $ 0.7 $ 0.7
Unrecognized compensation expense $ 3.7   $ 3.7  
Unrecognized compensation expense recognition period (in years)     2 years 1 month 6 days  
Third and fifth anniversaries        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Service period (in years)     5 years  
Vesting Percentage     50.00%  
Granted (in shares)     3,779  
Anniversary of grant date        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting Percentage     20.00%  
Granted (in shares)     67,348