Consolidated Statements of Comprehensive Income - LP - 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 (loss)		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 AMERICAN ASSETS TRUST, INC. STOCKHOLDERS		$ 43,506	$ 28,376	$ 27,660
EARNINGS PER COMMON SHARE, BASIC
Earnings per unit, basic (in USD per share)		$ 0.72	$ 0.47	$ 0.46
Weighted average units outstanding - basic (in shares)		60,048,970	59,990,740	59,806,309
EARNINGS PER COMMON SHARE, DILUTED
Earnings per unit, diluted (in USD per share)		$ 0.72	$ 0.47	$ 0.46
Weighted average units 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 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
American Assets Trust, L.P.
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 (loss)		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 AMERICAN ASSETS TRUST, INC. STOCKHOLDERS		$ 55,229	$ 36,029	$ 35,205
EARNINGS PER COMMON SHARE, BASIC
Earnings per unit, basic (in USD per share)		$ 0.72	$ 0.47	$ 0.46
Weighted average units outstanding - basic (in shares)		76,230,507	76,172,277	76,119,763
EARNINGS PER COMMON SHARE, DILUTED
Earnings per unit, diluted (in USD per share)		$ 0.72	$ 0.47	$ 0.46
Weighted average units outstanding - diluted (in shares)		76,230,507	76,172,277	76,119,763
DISTRIBUTIONS PER UNIT (in dollars per share)		$ 1.28	$ 1.16	$ 1.00
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
American Assets Trust, L.P. | Interest Expense
COMPREHENSIVE INCOME
Reclassification of amortization of forward-starting swap		(1,477)	(1,098)	(1,330)
American Assets Trust, L.P. | Early Extinguishment of Debt
COMPREHENSIVE INCOME
Reclassification of amortization of forward-starting swap		0	(193)	0
Limited Partner | American Assets Trust, L.P.
EXPENSES:
Net income	[1]	11,723	7,653	7,545
COMPREHENSIVE INCOME
Net income	[1]	11,723	7,653	7,545
Comprehensive income attributable to American Assets Trust, Inc.		(13,813)	(7,966)	(6,496)
General Partner | American Assets Trust, L.P.
EXPENSES:
Net income	[2]	44,154	28,940	28,043
COMPREHENSIVE INCOME
Net income	[2]	44,154	28,940	28,043
Comprehensive income attributable to American Assets Trust, Inc.		$ 51,906	$ 30,059	$ 24,113

[1] Consists of limited partnership interests held by third parties.

[2] Consists of general and limited partnership interests held by American Assets Trust, Inc.