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LONG-TERM DEBT - Schedule of Future Maturities of Long-term Debt (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Debt Instrument [Line Items]    
2018 $ 15,167,882  
2019 4,376  
2020 2,984,972  
2021 5,654  
2022 2,725,282  
Thereafter 6,739  
Total 20,894,905  
Original issue discount 136,600  
Long-term debt fees 109,071 $ 123,003
14.0% Senior Notes Due 2021    
Debt Instrument [Line Items]    
High yield discount obligation catch-up payments in 2019 64,700  
High yield discount obligation catch-up payments in 2020 $ 68,400