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
6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Grants in period (in shares) 0  
Share-based compensation $ 1,461 $ 2,629
Restricted Stock    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Fair value of shares vested $ 2,800 4,600
2013 Employee Stock Purchase Plan    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of shares issued under ESPP (in shares) 63,438  
Number of shares available for grant (in shares) 273,325  
Share-based compensation $ 1,500 $ 2,600