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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Details) - USD ($)
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Class of Stock [Line Items]                      
Restricted cash $ 3,110,000       $ 2,921,000       $ 3,110,000 $ 2,921,000 $ 3,851,000
Capitalized interest                 0 0  
Depreciation expense                 33,000,000.0 26,500,000 16,900,000
Amortization of debt financial costs and discounts on debt                 4,636,000 2,684,000 3,267,000
Individual stop loss                 100,000 100,000 100,000
Self-insurance liabilities 3,300,000       1,300,000       3,300,000 1,300,000  
Allocated share-based compensation expense                 17,700,000 3,800,000 (1,500,000)
Net income $ 20,223,000 $ 6,723,000 $ (23,555,000) $ (8,878,000) $ 13,355,000 $ 6,999,000 $ 17,180,000 $ 17,596,000 $ (5,487,000) $ 55,130,000 $ 71,438,000
Net income per share, diluted (in dollars per share) $ 0.61 $ 0.22 $ (0.77) $ (0.28) $ 0.40 $ 0.18 $ 0.42 $ 0.46 $ (0.18) $ 1.46 $ 1.87
Advertising expense                 $ 4,500,000 $ 7,600,000 $ 5,900,000
Expansion and pre-opening                 921,000 0 2,678,000
Storm related losses                 (14,095,000) 1,181,000 0
Interest expense, net of amounts capitalized                 63,248,000 39,830,000 23,025,000
Accounting standards update 2016-09                      
Class of Stock [Line Items]                      
Allocated share-based compensation expense                   (500,000)  
Net income                   $ 400,000  
Net income per share, diluted (in dollars per share)                   $ 0.01  
Rhode Island                      
Class of Stock [Line Items]                      
Net income                 20,276,000 $ 71,124,000 68,849,000
Interest expense, net of amounts capitalized                 $ 0 $ 3,274,000 $ 8,555,000
Sales revenue, segment | Rhode Island | VLT revenue                      
Class of Stock [Line Items]                      
Concentration risk                 30.00% 46.00% 56.00%