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GOODWILL AND INTANGIBLE ASSETS - Schedule of Estimated Aggregate Amortization Expense (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Jun. 30, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Dec. 31, 2017
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]            
Remainder of 2019 $ 474          
2020 1,591          
2021 1,313          
2022 1,137          
2023 960          
Thereafter 2,179          
Total $ 7,654 $ 8,140 $ 3,910 $ 284 $ 308 $ 356