Consolidated Statements of Cash Flows $ in Thousands	12 Months Ended
	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
OPERATING ACTIVITIES
Net income	$ 36,593	$ 35,588	$ 60,188
Adjustments to reconcile net income to net cash provided by operating activities:
Deferred rent revenue and amortization of lease intangibles	(17,634)	(31,242)	(6,985)
Depreciation and amortization	116,306	108,292	96,205
Amortization of debt issuance costs and debt fair value adjustments	2,753	1,477	1,467
Gain (Loss) on Extinguishment of Debt	4,271	0	0
Gain on sale of real estate	0	0	633
Stock-based compensation expense	8,493	6,307	4,477
Settlement of forward interest rate swap agreement	0	0	513
Lease termination income	0	0	(4,518)
Other noncash interest expense	(1,098)	(1,330)	(1,304)
Other, net	1,314	(695)	4,746
Changes in operating assets and liabilities
Change in accounts receivable	2,273	(4,940)	(1,071)
Change in other assets	109	141	(2,420)
Change in accounts payable and accrued expenses	15,331	(2,108)	5,956
Change in security deposits payable	443	(1,726)	(971)
Change in other liabilities and deferred credits	1,464	(1,206)	(3,585)
Net cash provided by operating activities	168,329	126,985	153,816
INVESTING ACTIVITIES
Acquisition of real estate, net	(204,511)	0	(507,780)
Capital expenditures	(104,588)	(63,488)	(88,327)
Proceeds from sale of real estate, net of selling costs	0	0	8,191
Leasing commissions	(3,142)	(5,589)	(11,267)
Purchase of marketable securities	(47,760)	0	0
Proceeds from Sale and Maturity of Marketable Securities	47,723	0	0
Net cash used in investing activities	(312,278)	(69,077)	(599,183)
FINANCING ACTIVITIES
Repayment of secured notes payable	0	(51,003)	(20,762)
Proceeds from unsecured line of credit	0	100,000	59,000
Repayment of unsecured line of credit	100,000	0	123,000
Proceeds from issuance of unsecured notes payable	494,675	0	150,000
Debt issuance costs	(5,075)	(125)	(1,103)
Proceeds from issuance of common stock, net	0	0	515,354
Dividends paid to common stock and unitholders	(88,936)	(76,510)	(80,605)
Shares withheld for employee taxes	(865)	(672)	(1,338)
Net cash provided by (used in) financing activities	144,424	(28,310)	497,546
Net (decrease) increase in cash and cash equivalents	475	29,598	52,179
Cash, cash equivalents and restricted cash, beginning of year	139,049	109,451	57,272
Cash, cash equivalents and restricted cash, end of year	139,524	139,049	109,451
Cash and cash equivalents	139,524	137,333	99,303
Restricted cash	0	1,716	10,148
Repayments of Unsecured Debt	(155,375)	0	0
American Assets Trust, L.P.
OPERATING ACTIVITIES
Net income	36,593	35,588	60,188
Adjustments to reconcile net income to net cash provided by operating activities:
Deferred rent revenue and amortization of lease intangibles	(17,634)	(31,242)	(6,985)
Depreciation and amortization	116,306	108,292	96,205
Amortization of debt issuance costs and debt fair value adjustments	2,753	1,477	1,467
Provision for uncollectable rental income	(2,289)	18,427	1,751
Gain (Loss) on Extinguishment of Debt	4,271	0	0
Gain on sale of real estate	0	0	633
Stock-based compensation expense	8,493	6,307	4,477
Settlement of forward interest rate swap agreement	0	0	513
Lease termination income	0	0	(4,518)
Other noncash interest expense	(1,098)	(1,330)	(1,304)
Other, net	1,314	(695)	4,746
Changes in operating assets and liabilities
Change in accounts receivable	2,273	(4,940)	(1,071)
Change in other assets	109	141	(2,420)
Change in accounts payable and accrued expenses	15,331	(2,108)	5,956
Change in security deposits payable	443	(1,726)	(971)
Change in other liabilities and deferred credits	1,464	(1,206)	(3,585)
Net cash provided by operating activities	168,329	126,985	153,816
INVESTING ACTIVITIES
Acquisition of real estate, net	(204,511)	0	(507,780)
Capital expenditures	(104,588)	(63,488)	(88,327)
Proceeds from sale of real estate, net of selling costs	0	0	8,191
Leasing commissions	(3,142)	(5,589)	(11,267)
Purchase of marketable securities	(47,760)	0	0
Proceeds from Sale and Maturity of Marketable Securities	47,723	0	0
Net cash used in investing activities	(312,278)	(69,077)	(599,183)
FINANCING ACTIVITIES
Repayment of secured notes payable	0	(51,003)	(20,762)
Proceeds from unsecured line of credit	0	100,000	59,000
Repayment of unsecured line of credit	100,000	0	123,000
Proceeds from issuance of unsecured notes payable	494,675	0	150,000
Debt issuance costs	(5,075)	(125)	(1,103)
Contributions from American Assets Trust, Inc.		0
Contributions from American Assets Trust, Inc.	0		515,354
Dividends paid to common stock and unitholders	(88,936)	(76,510)	(80,605)
Shares withheld for employee taxes	(865)	(672)	(1,338)
Net cash provided by (used in) financing activities	144,424	(28,310)	497,546
Net (decrease) increase in cash and cash equivalents	475	29,598	52,179
Cash, cash equivalents and restricted cash, beginning of year	139,049	109,451	57,272
Cash, cash equivalents and restricted cash, end of year	139,524	139,049	109,451
Cash and cash equivalents	139,524	137,333	99,303
Restricted cash	0	1,716	10,148
Repayments of Unsecured Debt	$ (155,375)	$ 0	$ 0