LONG-TERM DEBT - Schedule of Future Maturities of Long-Term Debt (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Debt Disclosure [Abstract]    
2018 $ 533  
2019 168  
2020 2,575,143  
2021 169  
2022 2,725,194  
Thereafter 1,186  
Total 5,302,393  
Original issue discount $ 241 $ 6,738