LONG-TERM DEBT - Maturities (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Debt Disclosure [Abstract]
Remainder of 2019	$ 3,438
2020	13,750
2021	13,750
2022	970,000
2023	192,500
After 2023	2,350,000
Total	3,543,438
Less: current portion of long-term debt	13,750	$ 13,750
Less: unamortized original issue discount	368,976
Less: unamortized debt issuance costs	(48,830)
Total long-term debt, net	$ 3,111,882	$ 2,245,548

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