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SHAREHOLDERS EQUITY - Stock based compensation - Share Awards (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 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) 6,196   19,852 7,835  
Stock surrendered to cover employee withholding taxes       $ 100  
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)     109,607    
Vested (in shares)     (54,112)    
Forfeited (in shares)     (1,888)    
Outstanding at end of year 263,051   263,051   209,444
Stock issued (in shares) 12,725   34,260    
Stock surrendered to cover employee withholding taxes $ 100   $ 300    
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)     60,859    
Forfeited (in shares)     (854)    
Outstanding at end of year 129,431   129,431   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   14,862