Quarterly report pursuant to Section 13 or 15(d)

SHARE BASED COMPENSATION - Narrative (Details)

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SHARE BASED COMPENSATION - Narrative (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Grants in period (in shares) 0  
Share-based compensation $ 2,733 $ 2,180
Restricted Stock    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Fair value of shares vested $ 2,800 2,800
2013 Employee Stock Purchase Plan    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of shares issued under ESPP (in shares) 120,754  
Number of shares available for grant (in shares) 101,624  
Share-based compensation $ 2,700 $ 2,200