FAIR VALUE MEASUREMENTS (Impairment Charges) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Impaired Long-Lived Assets Held and Used [Line Items]
Impairment of real estate assets	$ 11,676	$ 20,073
Land
Impaired Long-Lived Assets Held and Used [Line Items]
Impairment of real estate assets	2,925	2,527
Buildings, fixtures and improvements
Impaired Long-Lived Assets Held and Used [Line Items]
Impairment of real estate assets	8,264	17,107
Intangible lease assets
Impaired Long-Lived Assets Held and Used [Line Items]
Impairment of real estate assets	497	482
Intangible lease liabilities
Impaired Long-Lived Assets Held and Used [Line Items]
Impairment of real estate assets	$ 10	$ 43