GENERAL INFORMATION (Details) $ in Thousands				12 Months Ended
	Jan. 23, 2020 USD ($) casino	Mar. 28, 2019 USD ($)	Jan. 29, 2019 USD ($) casino	Dec. 31, 2019 USD ($) segment	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Jul. 14, 2015
Number of off-track betting sites				13
Number of reportable segments | segment				3
Total consideration paid, net of cash acquired				$ 9,606	$ 0	$ 0
Dover Downs
Number of table games				35
Number of poker tables				3
Number of hotel rooms				500
Number of slot machines				2,173
Convertible common stock receivable amount		0.0899
Total consideration paid, net of cash acquired		$ 96,400
Black Hawk
Number of businesses acquired | casino			3
Total consideration paid, net of cash acquired			$ 53,000
Black Hawk | Subsequent Event
Number of businesses acquired | casino	3
Total consideration paid, net of cash acquired	$ 53,000
Twin River Casino Hotel
Maximum amount of authorized VLTs				4,752
Blended share of VLT revenue entitled to				27.80%
Entitled share of revenue from table games				83.50%
Number of VLTs				4,108
Share of VLT revenue entitled to				28.10%
Number of table games				89
Number of poker tables				23
Number of stadium gaming positions				36
Number of hotel rooms				136
Hard Rock Biloxi
Number of table games				52
Number of slot machines				1,183
Number of hotel towers				2
Number of guest rooms and suites				479
Newport Grand Casino
Number of VLTs							1,100
Share of VLT revenue entitled to							28.00%
Tiverton Casino Hotel
Entitled share of revenue from table games				83.50%
Number of VLTs				1,000
Share of VLT revenue entitled to				28.10%
Number of table games				32
Number of stadium gaming positions				18
Number of hotel rooms				83