LONG-TERM DEBT - Rollforward (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 04, 2018
LONG-TERM DEBT
Total debt	$ 889,873	$ 929,901
Less: current portion of long-term debt	25,945	38,706
Less: original issue discount and issuance costs	13,620	17,438
Long-term debt, net	850,308	873,757
2017 Credit Facility [Member]
LONG-TERM DEBT
Total debt	320,629	323,926
2018 Credit Facility [Member]
LONG-TERM DEBT
Total debt	167,145	192,000
9.25% Senior Subordinated Notes due February 2020 [Member]
LONG-TERM DEBT
Total debt		2,037
7.375% Senior Secured Notes due April 2022 [Member]
LONG-TERM DEBT
Total debt	350,000	350,000
MGM National Harbor Loan [Member]
LONG-TERM DEBT
Total debt	$ 52,099	50,066	$ 50,000
Comcast Note due April 2019 [Member]
LONG-TERM DEBT
Total debt		$ 11,872