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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Other Operating items, net (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES        
Other operating items, net $ 1,233 $ 2,448 $ 2,799 $ 4,910
Professional service fees 1,500 500 3,000 800
Loss on disposition of assets 100   100  
Litigation proceeds 300   300  
Insurance claim proceeds $ 100   100  
Pre-opening expenses relating to the Monarch Black Hawk Expansion project   900   1,900
Colorado legislation lobbying expenses   500   1,400
Equipment, supplies and employee testing expenses due to the COVID-19 pandemic   400 $ 100 700
Write off of Deferred Debt Issuance Cost   $ 100   $ 95