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INCOME TAX - Net Deferred Tax Asset and Liability (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Income Tax Disclosure [Abstract]    
Noncurrent deferred income tax asset $ (7,627) $ (6,292)
Noncurrent deferred income tax liability 2,948,390 3,145,641
Net deferred income tax liability $ 2,940,763 $ 3,139,349