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STOCK-BASED COMPENSATION Restricted stock units (Details) - Restricted stock units - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total compensation cost not yet recognized $ 181  
Weighted average service period 1 year 2 months 16 days  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]    
Non-vested restricted stock (units), number of shares of restricted stock (unit), At the Beginning of the Year (shares) 63,436 57,773
Granted, Number of share of restricted stock (shares) 0 25,104.8
Share-based Compensation Arrangement By Share-based Payment Award, Equity Instruments Other Than Options, Shares Earned Above Target 0 723
Vested, number of share of restricted stock (shares) (6,384) (27,794)
Forfeited, number of share of restricted stock (shares) (21,281) (6,071)
Non-vested restricted stock (units), number of shares of restricted stock (unit), At the End of the Period (shares) 35,771 49,736
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]    
Non-vested restricted stock (units), weighted average grant date fair value, At the Beginning of the Year (usd per share) $ 15.12 $ 15.68
Granted, weighted average grant date fair value (usd per share) 0.00 15.30
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Shares Earned Above Target, Weighted Average Grant Date Fair Value 0.00 17.00
Vested, weighted average grant date fair value (usd per share) 12.39 16.25
Forfeited, weighted average grant date fair value (usd per share) 15.14 17.00
Non-vested restricted stock (units), weighted average grant date fair value, At the End of the Period (usd per share) $ 15.60 $ 15.37