LEASE REVENUE LEASE REVENUE (Details) - USD ($)	3 Months Ended				6 Months Ended
	Jun. 30, 2020		Jun. 30, 2019		Jun. 30, 2020	Jun. 30, 2019
Lease Revenue [Line Items]
Lease income - operating leases	$ 66,793,000		$ 61,478,000		$ 132,756,000	$ 120,370,000
Variable lease income	22,707,000	[1]	20,305,000	[1]	45,321,000	40,050,000	[1]
Income from real estate operations	89,500,000		$ 81,783,000		178,077,000	$ 160,420,000
Operating lease with rent concessions related to the effects of the COVID-19 pandemic [Member]
Lease Revenue [Line Items]
Income from real estate operations	$ 791,000				$ 791,000

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