REAL ESTATE ASSETS (2020 Property Acquisition - Narrative) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2020 USD ($) property	Mar. 31, 2019 USD ($) property	Dec. 31, 2019 USD ($) property
Real Estate [Line Items]
Number of properties acquired | property	0	0
Number of properties disposed | property	12	34
Aggregate gross sales price | $	$ 129,000	$ 124,300
Net proceeds from disposition of real estate assets | $	126,645	120,652
Gain on disposition of real estate, net | $	$ 13,100	$ 9,900
Number of real estate property held for sale | property	2		29
Assets held for sale | $	$ 8,000		$ 351,900
Mortgage notes payable | $	$ 5,000
Retail property
Real Estate [Line Items]
Number of properties disposed | property	9
Anchored shopping center
Real Estate [Line Items]
Number of properties disposed | property	3