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GENERAL INFORMATION - Description of Business (Details) $ in Thousands			12 Months Ended
	Nov. 18, 2020 USD ($) shares	Mar. 28, 2019 USD ($)	Dec. 31, 2020 USD ($) ft² tableGame slotMachine segment diningVenue videoLotteryTerminal bar-Dining room hotelTower site studioGamingPosition renewalTerm parkingGarage parkingSpace	Jul. 14, 2015 videoLotteryTerminal
Business Acquisition [Line Items]
Number of off-track betting sites | site			13
Capital expenditures period			5 years
Number of reportable segments | segment			4
Dover Downs
Business Acquisition [Line Items]
Number of table games			33
Number of poker tables			4
Number of hotel rooms | room			500
Number of slot machines | slotMachine			2,060
Convertible common stock receivable amount		0.0899
Cash paid to acquire business | $		$ 29,096
Black Hawk
Business Acquisition [Line Items]
Number of table games			16
Number of poker tables			17
Number of slot machines | slotMachine			569
Amount of gaming and casino space | ft²			34,632
Number of restaurants | renewalTerm			4
Number of parking garages | parkingGarage			1
Number of parking spaces | parkingSpace			700
Casino KC
Business Acquisition [Line Items]
Number of table games			13
Number of slot machines | slotMachine			887
Amount of gaming and casino space | ft²			39,788
Number of dining venues | diningVenue			2
Estimated total cost of project | $			$ 40,000
Casino Vicksburg
Business Acquisition [Line Items]
Number of table games			8
Number of hotel rooms | room			89
Number of slot machines | slotMachine			499
Amount of gaming and casino space | ft²			32,608
Number of dining venues | diningVenue			3
Bally’s Atlantic City
Business Acquisition [Line Items]
Number of table games			93
Number of hotel rooms | room			1,214
Number of slot machines | slotMachine			1,481
Number of dining venues | diningVenue			4
Estimated total cost of project | $	$ 90,000		$ 90,000
Capital expenditures period			5 years
Area of lease | ft²			83,569
Number of bars | bar-Dining			1
Amount of meeting space | ft²			80,000
Number of meeting rooms | room			28
Area of ballroom | ft²			12,000
Eldorado Resort Casino Shreveport
Business Acquisition [Line Items]
Number of table games			46
Number of poker tables			8
Number of hotel rooms | room			403
Number of slot machines | slotMachine			1,382
Amount of gaming and casino space | ft²			49,916
Number of dining venues | diningVenue			4
Number of bars | bar-Dining			2
Area of convention space | ft²			6,000
Bet.Works
Business Acquisition [Line Items]
Cash paid to acquire business | $	$ 62,500
Common stock issued (in shares) | shares	2,528,194
Category 4 licensed casino, Centre County, Pennsylvania
Business Acquisition [Line Items]
Number of table games			30
Number of slot machines | slotMachine			750
Estimated total cost of project | $			$ 120,000
Percentage of economic interest			100.00%
Hard Rock Biloxi
Business Acquisition [Line Items]
Number of table games			55
Number of slot machines | slotMachine			1,015
Number of hotel towers | hotelTower			2
Number of guest rooms and suites | room			479
Newport Grand Casino
Business Acquisition [Line Items]
Number of VLTs | videoLotteryTerminal				1,100
Share of VLT revenue entitled to				28.00%
Twin River Casino Hotel
Business Acquisition [Line Items]
Maximum amount of authorized VLTs | videoLotteryTerminal			4,752
Number of VLTs | videoLotteryTerminal			4,067
Number of table games			90
Number of poker tables			23
Number of stadium gaming positions | studioGamingPosition			36
Number of hotel rooms | room			136
Tiverton Casino Hotel
Business Acquisition [Line Items]
Number of VLTs | videoLotteryTerminal			1,000
Number of table games			32
Number of stadium gaming positions | studioGamingPosition			18
Number of hotel rooms | room			83

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