BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Revenue Recognition (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Disaggregation of Revenue [Line Items]
Fixed lease payments	$ 20,640,000	$ 34,114,000	$ 51,536,000	$ 67,315,000
Variable lease payments	1,779,000	3,711,000	4,464,000	5,654,000
Rental and other property income	22,419,000	37,825,000	56,000,000	72,969,000
Hotel income	9,549,000	10,160,000	19,353,000	19,849,000
Tenant recoveries outside of lease agreements	0	275,000	205,000	278,000
Remaining performance obligations	0		0
Rental and other property income
Disaggregation of Revenue [Line Items]
Hotel income	736,000	733,000	1,472,000	1,496,000
Interest and other income
Disaggregation of Revenue [Line Items]
Hotel income	45,000	54,000	94,000	93,000
Hotel income
Disaggregation of Revenue [Line Items]
Hotel income	$ 10,330,000	$ 10,947,000	$ 20,919,000	$ 21,438,000