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INCOME TAXES - Summary of Effective Tax Rate (Details)
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Income Tax Disclosure [Abstract]        
Reported tax rate 10.60% (35.40%) (2.30%) (35.20%)