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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Goodwill (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Goodwill from business combinations    
Goodwill $ 25,111 $ 25,111
Monarch Casino Resort Spa Black Hawk, Inc.    
Goodwill from business combinations    
Goodwill $ 25,100 $ 25,100