SEGMENT REPORTING (Details)	3 Months Ended
	Mar. 31, 2020 USD ($) segment	Mar. 31, 2019 USD ($)	Dec. 31, 2019 USD ($)
Segment Reporting [Abstract]
Number of operating segments | segment	6
Number of reporting segments | segment	3
Segment Reporting Information [Line Items]
Total revenue	$ 109,148,000	$ 120,631,000
Income (loss) from operations	(3,169,000)	30,307,000
Income (loss) before provision for income taxes	(14,542,000)	23,269,000
Depreciation and amortization	8,979,000	6,769,000
Interest expense	11,516,000	7,051,000
Capital expenditures	2,999,000	7,499,000
Goodwill	133,082,000	132,035,000	$ 133,082,000
Total assets	1,215,323,000	951,076,000	1,021,887,000
Rhode Island
Segment Reporting Information [Line Items]
Total revenue	56,279,000	86,125,000
Income (loss) from operations	11,005,000	31,319,000
Income (loss) before provision for income taxes	11,041,000	29,007,000
Depreciation and amortization	4,782,000	4,415,000
Interest expense	0	2,319,000
Capital expenditures	1,139,000	6,902,000
Goodwill	83,101,000	83,101,000	83,101,000
Total assets	504,597,000	550,274,000
Delaware
Segment Reporting Information [Line Items]
Total revenue	21,086,000	1,525,000
Income (loss) from operations	324,000	0
Income (loss) before provision for income taxes	283,000	0
Depreciation and amortization	1,454,000	0
Interest expense	41,000	0
Capital expenditures	765,000	0
Goodwill	1,047,000	0	1,047,000
Total assets	128,912,000	140,407,000
Biloxi
Segment Reporting Information [Line Items]
Total revenue	25,482,000	31,032,000
Income (loss) from operations	1,777,000	5,414,000
Income (loss) before provision for income taxes	1,786,000	5,418,000
Depreciation and amortization	2,263,000	2,307,000
Interest expense	0	0
Capital expenditures	714,000	582,000
Goodwill	48,934,000	48,934,000	48,934,000
Total assets	251,228,000	261,645,000
Other
Segment Reporting Information [Line Items]
Total revenue	6,301,000	1,949,000
Income (loss) from operations	(16,275,000)	(6,426,000)
Income (loss) before provision for income taxes	(27,652,000)	(11,156,000)
Depreciation and amortization	480,000	47,000
Interest expense	11,475,000	4,732,000
Capital expenditures	381,000	15,000
Goodwill	0	0	$ 0
Total assets	$ 330,586,000	$ (1,250,000)