LONG-TERM DEBT - Rollforward (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
LONG-TERM DEBT
Total debt	$ 832,505	$ 855,156
Less: current portion of long-term debt	0	23,362
Less: original issue discount and issuance costs	14,731	12,870
Long-term debt, net	817,774	818,924
2018 Credit Facility [Member]
LONG-TERM DEBT
Total debt	0	129,935
2017 Credit Facility [Member]
LONG-TERM DEBT
Total debt	0	317,332
7.375% Senior Secured Notes due February 2028
LONG-TERM DEBT
Total debt	825,000	0
PPP loan
LONG-TERM DEBT
Total debt	7,505	0
MGM National Harbor Loan [Member]
LONG-TERM DEBT
Total debt	0	57,889
8.75% Senior Secured Notes due December 2022
LONG-TERM DEBT
Total debt	0	347,016
7.375% Senior Secured Notes due April 2022
LONG-TERM DEBT
Total debt	$ 0	$ 2,984

Amount of long-term portion of original issue discount on debt.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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