SEGMENT REPORTING - Reconciliation of Segment Profit to Net Income Attributable to Stockholders (Details) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2023	Sep. 30, 2022
Segment Reporting [Abstract]
Total segments’ profit	$ 69,887			$ 71,108			$ 208,428	$ 204,019
General and administrative	(8,880)			(8,376)			(26,488)	(23,130)
Depreciation and amortization	(29,868)			(31,729)			(89,592)	(93,228)
Interest expense, net	(16,325)			(14,454)			(48,422)	(43,667)
Other income (expense), net	321			(180)			7,272	(523)
NET INCOME	15,135	$ 15,397	$ 20,666	16,369	$ 13,588	$ 13,514	51,198	43,471
Net income attributable to restricted shares	(189)			(155)			(568)	(464)
Net income attributable to unitholders in the Operating Partnership	(3,168)			(3,442)			(10,733)	(9,130)
NET INCOME ATTRIBUTABLE TO AMERICAN ASSETS TRUST	$ 11,778			$ 12,772			$ 39,897	$ 33,877