REVENUE RECOGNITION - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disaggregation of Revenue [Line Items]
Total revenue	$ 130,419	$ 129,309	$ 143,218	$ 120,631	$ 111,422	$ 110,494	$ 110,815	$ 104,806	$ 523,577	$ 437,537	$ 421,053
Gaming
Disaggregation of Revenue [Line Items]
Total revenue									367,948	327,740	314,794
Racing
Disaggregation of Revenue [Line Items]
Total revenue									13,114	13,158	14,034
Hotel
Disaggregation of Revenue [Line Items]
Total revenue									38,988	21,339	19,431
Food and beverage
Disaggregation of Revenue [Line Items]
Total revenue									69,904	48,380	47,004
Other
Disaggregation of Revenue [Line Items]
Total revenue									33,623	26,920	25,790
Rhode Island
Disaggregation of Revenue [Line Items]
Total revenue									306,306	302,652	287,859
Rhode Island | Gaming
Disaggregation of Revenue [Line Items]
Total revenue									239,836	246,126	235,224
Rhode Island | Racing
Disaggregation of Revenue [Line Items]
Total revenue									3,536	3,796	3,902
Rhode Island | Hotel
Disaggregation of Revenue [Line Items]
Total revenue									6,675	1,361	0
Rhode Island | Food and beverage
Disaggregation of Revenue [Line Items]
Total revenue									33,124	29,922	28,447
Rhode Island | Other
Disaggregation of Revenue [Line Items]
Total revenue									23,135	21,447	20,286
Delaware
Disaggregation of Revenue [Line Items]
Total revenue									80,806
Delaware | Gaming
Disaggregation of Revenue [Line Items]
Total revenue									43,865
Delaware | Racing
Disaggregation of Revenue [Line Items]
Total revenue									931
Delaware | Hotel
Disaggregation of Revenue [Line Items]
Total revenue									12,228
Delaware | Food and beverage
Disaggregation of Revenue [Line Items]
Total revenue									19,799
Delaware | Other
Disaggregation of Revenue [Line Items]
Total revenue									3,983
Biloxi
Disaggregation of Revenue [Line Items]
Total revenue									127,432	125,137	122,694
Biloxi | Gaming
Disaggregation of Revenue [Line Items]
Total revenue									84,247	81,614	79,570
Biloxi | Racing
Disaggregation of Revenue [Line Items]
Total revenue									0	0	0
Biloxi | Hotel
Disaggregation of Revenue [Line Items]
Total revenue									20,085	19,978	19,431
Biloxi | Food and beverage
Disaggregation of Revenue [Line Items]
Total revenue									16,886	18,342	18,440
Biloxi | Other
Disaggregation of Revenue [Line Items]
Total revenue									6,214	5,203	5,253
Other
Disaggregation of Revenue [Line Items]
Total revenue									9,033	9,748	10,500
Other | Gaming
Disaggregation of Revenue [Line Items]
Total revenue									0	0	0
Other | Racing
Disaggregation of Revenue [Line Items]
Total revenue									8,647	9,362	10,132
Other | Hotel
Disaggregation of Revenue [Line Items]
Total revenue									0	0	0
Other | Food and beverage
Disaggregation of Revenue [Line Items]
Total revenue									95	116	117
Other | Other
Disaggregation of Revenue [Line Items]
Total revenue									$ 291	$ 270	$ 251