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RESTRUCTURING/INTEGRATION COSTS - Workforce Reduction Activity (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2018
Restructuring Reserve [Roll Forward]      
Beginning balance $ 201 $ 175  
Plus: additions 9 26 $ 2,100
Less: cash payments (210) 0  
Ending balance $ 0 $ 201