ACQUISITION, INTEGRATION AND RESTRUCTURING EXPENSE (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019	Dec. 31, 2018
Restructuring Cost and Reserve [Line Items]
Acquisition costs	$ 2,458,000	$ 1,523,000	$ 4,224,000	$ 8,401,000
Restructuring expense	0	716,000	20,000	716,000
Total acquisition, integration and restructuring expense	2,458,000	2,239,000	4,244,000	9,117,000
Delaware Restructuring
Restructuring Cost and Reserve [Line Items]
Restructuring expense			20,000	716,000
Restructuring Reserve	0	355,000	0	355,000	$ 23,000	$ 0
Payments for Restructuring			43,000	361,000
Dover Downs merger and going public expenses
Restructuring Cost and Reserve [Line Items]
Acquisition costs	5,000	759,000	59,000	7,199,000
Black Hawk Casinos
Restructuring Cost and Reserve [Line Items]
Acquisition costs	200,000
Casino KC and Casino Vicksburg
Restructuring Cost and Reserve [Line Items]
Acquisition costs	424,000	515,000	862,000	515,000
Black Hawk, CO Properties
Restructuring Cost and Reserve [Line Items]
Acquisition costs	181,000	249,000	752,000	687,000
Bally's Atlantic City [Member]
Restructuring Cost and Reserve [Line Items]
Acquisition costs	931,000	0	1,520,000	0
Shreveport & MontBleu Properties [Member]
Restructuring Cost and Reserve [Line Items]
Acquisition costs	$ 917,000	$ 0	$ 1,031,000	$ 0