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FINANCIAL INSTRUMENTS - Carrying Value and Fair Value of Financial Instruments (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Carrying Value    
Balance Sheet Grouping, Financial Statement Captions    
Long-term debt, net $ (3,845,555) $ (3,840,930)
Unamortized original issue discount and debt issuance costs 46,900 51,600
Fair Value    
Balance Sheet Grouping, Financial Statement Captions    
Long-term debt, net (6,458,340) (6,267,976)
Fair Value | 2022 Exchangeable Notes    
Balance Sheet Grouping, Financial Statement Captions    
Long-term debt, net (1,898,100) (1,780,300)
Fair Value | 2026 Exchangeable Notes    
Balance Sheet Grouping, Financial Statement Captions    
Long-term debt, net (1,096,200) (1,052,100)
Fair Value | 2030 Exchangeable Notes    
Balance Sheet Grouping, Financial Statement Captions    
Long-term debt, net $ (1,168,900) $ (1,113,900)