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GOODWILL AND INTANGIBLE ASSETS - Schedule of Future Amortization (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]    
2019 $ 6,218  
2020 4,252  
Total estimated amortization expense $ 10,470 $ 19,114