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FINANCIAL INSTRUMENTS - Carrying Value and Fair Value of Financial Instruments (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Current portion of long-term debt $ (13,750) $ (13,750)
Long-term debt, net (3,111,882) (2,245,548)
Unamortized original issue discount and debt issuance costs 417,800 88,900
Carrying Value    
Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Current portion of long-term debt (13,750) (13,750)
Long-term debt, net (3,111,882) (2,245,548)
Fair Value    
Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Current portion of long-term debt (13,681) (12,753)
Long-term debt, net $ (3,934,574) $ (2,460,204)