Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
ASSETS
Operating real estate	$ 3,389,726	$ 3,155,280
Construction in progress	139,098	91,047
Held for development	547	547
Total Real estate, at cost	3,529,371	3,246,874
Accumulated depreciation	(847,390)	(754,140)
Net real estate	2,681,981	2,492,734
Cash and cash equivalents	139,524	137,333
Restricted cash	0	1,716
Accounts receivable, net	7,445	6,938
Deferred rent receivables, net	82,724	72,476
Other assets, net	106,253	106,112
TOTAL ASSETS	3,017,927	2,817,309
LIABILITIES AND EQUITY
Secured notes payable	110,965	110,923
Unsecured notes payable, net	1,538,238	1,196,677
Unsecured line of credit, net	0	99,151
Accounts payable and accrued expenses	64,531	59,262
Security deposits payable	7,855	6,590
Other liabilities and deferred credits	86,215	91,300
Total liabilities	1,807,804	1,563,903
Commitments and contingencies (Note 12)
Common stock, shares authorized	490,000,000	490,000,000
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares issued	60,525,580	60,476,292
Common stock, shares outstanding	60,525,580	60,476,292
American Assets Trust, Inc. stockholders' equity
Common stock, $0.01 par value, 490,000,000 shares authorized, 60,525,580 and 60,476,292 shares issued and outstanding at December 31, 2021 and December 31, 2020, respectively	$ 605	$ 605
Additional paid-in capital	1,453,272	1,445,644
Accumulated dividends in excess of net income	(217,785)	(176,560)
Accumulated other comprehensive income	2,872	1,753
Total American Assets Trust, Inc. stockholders' equity	1,238,964	1,271,442
Noncontrolling interests	(28,841)	(18,036)
Total equity	1,210,123	1,253,406
TOTAL LIABILITIES AND EQUITY	3,017,927	2,817,309
American Assets Trust, L.P.
ASSETS
Operating real estate	3,389,726	3,155,280
Construction in progress	139,098	91,047
Held for development	547	547
Total Real estate, at cost	3,529,371	3,246,874
Accumulated depreciation	(847,390)	(754,140)
Net real estate	2,681,981	2,492,734
Cash and cash equivalents	139,524	137,333
Restricted cash	0	1,716
Accounts receivable, net	7,445	6,938
Deferred rent receivables, net	82,724	72,476
Other assets, net	106,253	106,112
TOTAL ASSETS	3,017,927	2,817,309
LIABILITIES AND EQUITY
Secured notes payable	110,965	110,923
Unsecured notes payable, net	1,538,238	1,196,677
Unsecured line of credit, net	0	99,151
Accounts payable and accrued expenses	64,531	59,262
Security deposits payable	7,855	6,590
Other liabilities and deferred credits	86,215	91,300
Total liabilities	1,807,804	1,563,903
American Assets Trust, Inc. stockholders' equity
Accumulated other comprehensive income	4,169	2,737
TOTAL LIABILITIES AND EQUITY	3,017,927	2,817,309
Partners' Capital [Abstract]
Limited partners' capital, 16,181,537 and 16,181,537 units issued and outstanding as of December 31, 2021 and December 31, 2020, respectively	(30,138)	(19,020)
General partner's capital, 60,525,580 and 60,476,292 units issued and outstanding as of December 31, 2021 and December 31, 2020, respectively	1,236,092	1,269,689
Total capital	$ 1,210,123	$ 1,253,406