Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
REVENUE:
Rental income	$ 419,373	$ 402,507	$ 360,208
Other property income	21,791	20,141	15,620
Total revenue	441,164	422,648	375,828
EXPENSES:
Rental expenses	118,801	107,645	86,980
Real estate taxes	45,156	44,788	42,794
General and administrative	35,960	32,143	29,879
Depreciation and amortization	119,500	123,338	116,306
Total operating expenses	319,417	307,914	275,959
OPERATING INCOME	121,747	114,734	99,869
Interest expense, net	(64,706)	(58,232)	(58,587)
Loss on early extinguishment of debt	0	0	(4,271)
Other income (expense), net	7,649	(625)	(418)
Net income	64,690	55,877	36,593
Net income attributable to restricted shares	(761)	(648)	(564)
Net income attributable to unitholders in the Operating Partnership	(13,551)	(11,723)	(7,653)
NET INCOME ATTRIBUTABLE TO AMERICAN ASSETS TRUST, INC. STOCKHOLDERS	$ 50,378	$ 43,506	$ 28,376
EARNINGS PER COMMON SHARE, BASIC
Basic income attributable to common stockholders per share (in USD per share)	$ 0.84	$ 0.72	$ 0.47
Weighted average shares of common stock outstanding-basic (in shares)	60,158,976	60,048,970	59,990,740
EARNINGS PER COMMON SHARE, DILUTED
Diluted income attributable to common stockholders per share (in USD per share)	$ 0.84	$ 0.72	$ 0.47
Weighted average shares of common stock outstanding-diluted (in shares)	76,340,513	76,230,507	76,172,277
COMPREHENSIVE INCOME
Net income	$ 64,690	$ 55,877	$ 36,593
Other comprehensive (loss) income - unrealized (loss) income on swap derivatives during the period	(1,827)	11,319	2,723
Comprehensive income	61,714	65,719	38,025
Comprehensive income attributable to noncontrolling interest	(12,917)	(13,813)	(7,966)
Comprehensive income attributable to American Assets Trust, Inc.	48,797	51,906	30,059
Forward starting swaps included in interest expense, net
COMPREHENSIVE INCOME
Reclassification of amortization of forward starting swaps	(1,149)	(1,477)	(1,098)
Forward-starting swap realized gain included in loss on early extinguishment of debt
COMPREHENSIVE INCOME
Reclassification of amortization of forward starting swaps	$ 0	$ 0	$ (193)