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INCOME TAX - Net Deferred Tax Asset and Liability (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Income Tax Disclosure [Abstract]    
Noncurrent deferred income tax asset $ 8,128 $ 13,146
Noncurrent deferred income tax liability (585,025) (436,879)
Net deferred income tax liability $ (576,897) $ (423,733)