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GOODWILL AND INTANGIBLE ASSETS - Schedule of Future Amortization (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]    
2018 $ 8,644  
2019 6,218  
2020 4,252  
2021 0  
2022 0  
Thereafter 0  
Total estimated amortization expense $ 19,114 $ 31,043