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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%

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