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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Promotional Allowances, Advertising Costs and Gaming Taxes (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Gaming Taxes |  |  |
Gaming taxes | $ 17.2 | $ 23.0 | $ 22.3
Selling, general and administrative |  |  |
Advertising Costs |  |  |
Advertising expense | $ 4.5 | $ 5.0 | $ 4.9

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- Definition Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 720 -SubTopic 35 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6420018&loc=d3e36677-107848 + Details
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