SEGMENT REPORTING - Reconciliation of Segment Profit to Net Income Attributable to Stockholders (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2022	Jun. 30, 2021
Segment Reporting [Abstract]
Total segments’ profit	$ 67,015		$ 60,993		$ 132,911	$ 115,379
General and administrative	(7,612)		(6,924)		(14,754)	(13,747)
Depreciation and amortization	(31,087)		(27,646)		(61,499)	(55,147)
Interest expense	(14,547)		(14,862)		(29,213)	(28,867)
Loss on early extinguishment of debt	0		0		0	(4,271)
Other (expense) income, net	(181)		(74)		(343)	(127)
NET INCOME	13,588	$ 13,514	11,487	$ 1,733	27,102	13,220
Net income attributable to restricted shares	(154)		(135)		(309)	(272)
Net income attributable to unitholders in the Operating Partnership	(2,852)		(2,411)		(5,688)	(2,750)
Net income attributable to American Assets Trust, Inc. stockholders	$ 10,582		$ 8,941		$ 21,105	$ 10,198