LONG-TERM DEBT - Maturities (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Debt Disclosure [Abstract]
Remainder of 2019	$ 6,875
2020	13,750
2021	13,750
2022	1,004,489
2023	192,500
After 2023	2,350,000
Total	3,581,364
Less: current portion of long-term debt	13,750	$ 13,750
Less: unamortized original issue discount	379,324
Less: unamortized debt issuance costs	49,759
Total long-term debt, net	$ 3,138,531	$ 2,245,548

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