FAIR VALUE MEASUREMENTS (Impairment Charges) (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Impaired Long-Lived Assets Held and Used [Line Items]
Impairment of real estate assets	$ 15,507	$ 33,155
Land
Impaired Long-Lived Assets Held and Used [Line Items]
Impairment of real estate assets	3,541	5,180
Buildings, fixtures and improvements
Impaired Long-Lived Assets Held and Used [Line Items]
Impairment of real estate assets	11,315	27,034
Intangible lease assets
Impaired Long-Lived Assets Held and Used [Line Items]
Impairment of real estate assets	696	1,044
Intangible lease liabilities
Impaired Long-Lived Assets Held and Used [Line Items]
Impairment of intangible lease liability	$ (45)	$ (103)