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LONG-TERM DEBT - 6.375% Senior Secured Notes due 2026 (Details) - Secured Debt - 6.375% Senior Secured Notes due 2026 - USD ($)
May 01, 2019
Sep. 30, 2019
Debt Instrument [Line Items]    
Debt instrument, face amount $ 800,000,000 $ 800,000,000
Stated interest rate   6.375%
Redemption of principal plus applicable premium 100.00%  
Percentage of principal amount redeemed 40.00%  
Percentage of redemption price 106.375%