ACQUISITIONS, DISPOSITIONS AND IMPAIRMENT CHARGES - Impairment Charges (Details) $ in Thousands	3 Months Ended				12 Months Ended
	Dec. 31, 2020 USD ($)	Sep. 30, 2020 USD ($) a	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Business Combinations [Abstract]
Impairment of real estate area (in acres) | a		8.7
Impairment charge | $	$ 0	$ 3,642	$ 0	$ 0	$ 3,642	$ 0