BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Revenue Recognition (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Disaggregation of Revenue [Line Items]
Fixed lease payments	$ 15,389,000	$ 34,108,000	$ 66,925,000	$ 101,423,000
Variable lease payments	1,917,000	2,498,000	6,381,000	8,152,000
Rental and other property income	17,306,000	36,606,000	73,306,000	109,575,000
Hotel income	7,734,000	7,715,000	27,087,000	27,564,000
Tenant recoveries outside of lease agreements	0	120,000	205,000	398,000
Remaining performance obligations	0		0
Rental and other property income
Disaggregation of Revenue [Line Items]
Hotel income	736,000	777,000	2,208,000	2,273,000
Interest and other income
Disaggregation of Revenue [Line Items]
Hotel income	41,000	50,000	135,000	143,000
Hotel income
Disaggregation of Revenue [Line Items]
Hotel income	$ 8,511,000	$ 8,542,000	$ 29,430,000	$ 29,980,000