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SHAREHOLDERS EQUITY - Stock based compensation - Share Awards (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]        
Granted (in shares)       62,569
Stock issued (in shares) 15,446   15,446  
Stock surrendered (in shares)   19,852 7,835  
Stock surrendered to cover employee withholding taxes     $ 0.1  
Time Vesting Units        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]        
Outstanding at beginning of year   209,444    
Granted (in shares)   90,727    
Vested (in shares)   (54,112)    
Forfeited (in shares)   (1,888)    
Outstanding at end of year   244,171   209,444
Stock issued (in shares)   34,260    
Stock surrendered to cover employee withholding taxes   $ 0.3    
Financial Performance Units        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]        
Outstanding at beginning of year   69,426    
Granted (in shares)   60,160    
Forfeited (in shares)   (854)    
Outstanding at end of year   128,732   69,426
Market Performance Units        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]        
Outstanding at beginning of year   14,862    
Outstanding at end of year   14,862   14,862