BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Revenue Recognition (Details) - USD ($)	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Disaggregation of Revenue [Line Items]
Fixed lease payments	$ 31,053,000	$ 33,442,000
Variable lease payments	2,528,000	1,702,000
Rental and other property income	33,581,000	35,144,000
Hotel income	9,804,000	9,689,000
Tenant recoveries outside of lease agreements	205,000	3,000
Remaining performance obligations	0
Rental and other property income
Disaggregation of Revenue [Line Items]
Hotel income	736,000	763,000
Interest and other income
Disaggregation of Revenue [Line Items]
Hotel income	49,000	39,000
Hotel income
Disaggregation of Revenue [Line Items]
Hotel income	$ 10,589,000	$ 10,491,000