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INCOME TAXES - Summary of Effective Tax Rate (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Income Tax Disclosure [Abstract]        
Reported tax rate (0.40%) (20.60%) (3.50%) (8.40%)