LONG-TERM DEBT - Rollforward (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
LONG-TERM DEBT
Total debt	$ 855,156	$ 889,873
Less: current portion of long-term debt	23,362	25,945
Less: original issue discount and issuance costs	12,870	13,620
Long-term debt, net	818,924	850,308
2017 Credit Facility [Member]
LONG-TERM DEBT
Total debt	317,332	320,629
2018 Credit Facility [Member]
LONG-TERM DEBT
Total debt	129,935	167,145
8.75% Senior Secured Notes due December 2022
LONG-TERM DEBT
Total debt	347,016
7.375% Notes
LONG-TERM DEBT
Total debt	2,984	350,000
MGM National Harbor Loan [Member]
LONG-TERM DEBT
Total debt	$ 57,889	$ 52,099