SUBSEQUENT EVENTS (Property Acquisitions and Dispositions) (Details) $ in Thousands	1 Months Ended	6 Months Ended
	Aug. 13, 2020 USD ($) property	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($) property	Dec. 31, 2019 USD ($)
Subsequent Event [Line Items]
Number of properties acquired | property			0
Total real estate assets, at cost		$ 3,062,583		$ 2,843,438
Number of properties disposed | property			39
Aggregate gross sales price			$ 163,900
Net proceeds from disposition of real estate assets		157,198	159,052
Gain (loss) on sale of properties		$ 16,901	$ 13,400
Subsequent event
Subsequent Event [Line Items]
Number of properties acquired | property	2
Total real estate assets, at cost	$ 9,800
Number of properties disposed | property	1
Aggregate gross sales price	$ 1,300
Net proceeds from disposition of real estate assets	1,200
Gain (loss) on sale of properties	$ 33