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INCOME TAXES - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Jul. 01, 2018
Income Tax Disclosure [Abstract]            
Deferred tax asset related to disposal of certain assets           $ 257,100
Effective income tax rate (10.60%) 4.64% (1.50%) 3.65%    
Provisional amount related to remeasurement of deferred tax assets and liabilities         $ 96,400  
Provisional expense related to transition tax on mandatory deemed repatriation of foreign earnings         $ 1,500  
Increase in uncertain tax positions within 12 months $ 0   $ 0      
Decrease in uncertain tax positions within 12 months $ 0   $ 0