LONG-TERM DEBT - Rollforward (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
LONG-TERM DEBT
Total debt	$ 887,704	$ 889,873
Less: current portion of long-term debt	49,997	25,945
Less: original issue discount and issuance costs	10,579	13,620
Long-term debt, net	827,128	850,308
2017 Credit Facility [Member]
LONG-TERM DEBT
Total debt	318,156	320,629
2018 Credit Facility [Member]
LONG-TERM DEBT
Total debt	134,736	167,145
ABL Facility
LONG-TERM DEBT
Total debt	27,500	0
7.375% Senior Secured Notes due April 2022
LONG-TERM DEBT
Total debt	350,000	350,000
MGM National Harbor Loan [Member]
LONG-TERM DEBT
Total debt	$ 57,312	$ 52,099