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STOCK COMPENSATION - Summary of Stock Compensation Expense (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock compensation expense $ 1,505 $ 1,268 $ 3,605 $ 3,027
Equity based awards        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock compensation expense 1,498 1,268 3,584 3,027
Equity based stock options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock compensation expense 206 152 454 559
Restricted and performance-based stock awards        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock compensation expense 1,292 $ 1,116 3,130 $ 2,468
Liability based stock option        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock compensation expense $ 7   $ 21