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FINANCIAL INSTRUMENTS - Carrying Value and Fair Value of Financial Instruments (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Carrying Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Long-term debt, net $ (3,534,706) $ (2,889,626)
Unamortized original issue discount and debt issuance costs 357,800 402,900
Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Long-term debt, net $ (6,267,976) $ (3,904,406)