Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
REVENUE:
Rental income	$ 402,507	$ 360,208	$ 330,312
Other property income	20,141	15,620	14,261
Total revenue	422,648	375,828	344,573
EXPENSES:
Rental expenses	107,645	86,980	79,178
Real estate taxes	44,788	42,794	41,941
General and administrative	32,143	29,879	26,581
Depreciation and amortization	123,338	116,306	108,292
Total operating expenses	307,914	275,959	255,992
OPERATING INCOME	114,734	99,869	88,581
Interest expense, net	(58,232)	(58,587)	(53,440)
Loss on early extinguishment of debt	0	(4,271)	0
Other (expense) income, net	(625)	(418)	447
Net income	55,877	36,593	35,588
Net income attributable to restricted shares	(648)	(564)	(383)
Net income attributable to unitholders in the Operating Partnership	(11,723)	(7,653)	(7,545)
NET INCOME ATTRIBUTABLE TO AMERICAN ASSETS TRUST, INC. STOCKHOLDERS	$ 43,506	$ 28,376	$ 27,660
EARNINGS PER COMMON SHARE, BASIC
Basic income attributable to common stockholders per share (in USD per share)	$ 0.72	$ 0.47	$ 0.46
Weighted average shares of common stock outstanding-basic (in shares)	60,048,970	59,990,740	59,806,309
EARNINGS PER COMMON SHARE, DILUTED
Diluted income attributable to common stockholders per share (in USD per share)	$ 0.72	$ 0.47	$ 0.46
Weighted average shares of common stock outstanding-diluted (in shares)	76,230,507	76,172,277	76,119,763
COMPREHENSIVE INCOME
Net income	$ 55,877	$ 36,593	$ 35,588
Other comprehensive gain (loss) - unrealized gain (loss) on swap derivatives during the period	11,319	2,723	(3,649)
Comprehensive income	65,719	38,025	30,609
Comprehensive income attributable to noncontrolling interest	(13,813)	(7,966)	(6,496)
Comprehensive income attributable to American Assets Trust, Inc.	51,906	30,059	24,113
Interest Expense
COMPREHENSIVE INCOME
Reclassification of amortization of forward-starting swap	(1,477)	(1,098)	(1,330)
Early Extinguishment of Debt
COMPREHENSIVE INCOME
Reclassification of amortization of forward-starting swap	$ 0	$ (193)	$ 0