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STOCK-BASED COMPENSATION Restricted stock units (Details) - Restricted stock units - USD ($)
$ / shares in Units, $ in Thousands
9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total compensation cost not yet recognized $ 258  
Weighted average service period 1 year 9 months 4 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) 57,773 108,894
Granted, Number of share of restricted stock (shares) 85,139 67,166
Share-based Compensation Arrangement By Share-based Payment Award, Equity Instruments Other Than Options, Shares Earned Above Target 723 24,486
Vested, number of share of restricted stock (shares) (61,612) (141,970)
Forfeited, number of share of restricted stock (shares) (15,090) (803)
Non-vested restricted stock (units), number of shares of restricted stock (unit), At the End of the Period (shares) 66,933 57,773
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) $ 15.68 $ 11.60
Granted, weighted average grant date fair value (usd per share) 15.04 17.40
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Shares Earned Above Target, Weighted Average Grant Date Fair Value 17.00 10.00
Vested, weighted average grant date fair value (usd per share) 14.91 12.50
Forfeited, weighted average grant date fair value (usd per share) 15.38 10.00
Non-vested restricted stock (units), weighted average grant date fair value, At the End of the Period (usd per share) $ 15.22 $ 15.70
Non-Employee Director    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]    
Granted, Number of share of restricted stock (shares) 34,305  
Corporate    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other that Options, Percentage of Shares Issued Based on Performance of Group Adjusted EBITDA 25.00%  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other that Options, Percentage of Shares Issued Based on Performance of Adjusted EBITDA 75.00%