LEASE REVENUE LEASE REVENUE (Details) - USD ($)		3 Months Ended		9 Months Ended
		Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Lease Revenue [Line Items]
Lease income - operating leases		$ 68,528,000	$ 62,901,000	$ 201,284,000	$ 183,271,000
Variable lease income	[1]	23,472,000	21,012,000	68,793,000	61,062,000
Income from real estate operations		92,000,000	$ 83,913,000	270,077,000	$ 244,333,000
Operating lease with rent concessions related to the effects of the COVID-19 pandemic [Member]
Lease Revenue [Line Items]
Income from real estate operations		$ 549,000		$ 1,340,000

[1] Primarily includes tenant reimbursements for real estate taxes, insurance and common area maintenance.