Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
OPERATING ACTIVITIES
Net income	$ 35,588	$ 60,188	$ 27,202
Adjustments to reconcile net income to net cash provided by operating activities:
Deferred rent revenue and amortization of lease intangibles	(31,242)	(6,985)	(1,157)
Depreciation and amortization	108,292	96,205	107,093
Amortization of debt issuance costs and debt fair value adjustments	1,477	1,467	1,530
Gain on sale of real estate	0	633	0
Stock-based compensation expense	6,307	4,477	3,039
Settlement of forward interest rate swap agreement	0	513	0
Lease termination income	0	(4,518)	0
Other noncash interest expense	(1,330)	(1,304)	(1,279)
Other, net	(695)	4,746	(407)
Changes in operating assets and liabilities
Change in accounts receivable	(4,940)	(1,071)	(336)
Change in other assets	141	(2,420)	(227)
Change in accounts payable and accrued expenses	(2,108)	5,956	(3,297)
Change in security deposits payable	(1,726)	(971)	2,274
Change in other liabilities and deferred credits	(1,206)	(3,585)	1,282
Net cash provided by operating activities	126,985	153,816	136,507
INVESTING ACTIVITIES
Acquisition of real estate, net	0	(507,780)	0
Capital expenditures	(63,488)	(88,327)	(54,411)
Proceeds from sale of real estate, net of selling costs	0	8,191	0
Leasing commissions	(5,589)	(11,267)	(9,936)
Net cash used in investing activities	(69,077)	(599,183)	(64,347)
FINANCING ACTIVITIES
Repayment of secured notes payable	(51,003)	(20,762)	(97,124)
Proceeds from unsecured line of credit	100,000	59,000	84,000
Repayment of unsecured line of credit	0	123,000	20,000
Proceeds from issuance of unsecured notes payable	0	150,000	0
Debt issuance costs	(125)	(1,103)	(2,727)
Proceeds from issuance of common stock, net	0	515,354	(236)
Dividends paid to common stock and unitholders	(76,510)	(80,605)	(70,228)
Shares withheld for employee taxes	(672)	(1,338)	(527)
Net cash provided by (used in) financing activities	(28,310)	497,546	(106,842)
Net (decrease) increase in cash and cash equivalents	29,598	52,179	(34,682)
Cash, cash equivalents and restricted cash, beginning of year	109,451	57,272	91,954
Cash, cash equivalents and restricted cash, end of year	139,049	109,451	57,272
Cash and cash equivalents	137,333	99,303	47,956
Restricted cash	1,716	10,148	9,316
American Assets Trust, L.P.
OPERATING ACTIVITIES
Net income	35,588	60,188	27,202
Adjustments to reconcile net income to net cash provided by operating activities:
Deferred rent revenue and amortization of lease intangibles	(31,242)	(6,985)	(1,157)
Depreciation and amortization	108,292	96,205	107,093
Amortization of debt issuance costs and debt fair value adjustments	1,477	1,467	1,530
Provision for uncollectable rental income	18,427	1,751	790
Gain on sale of real estate	0	633	0
Stock-based compensation expense	6,307	4,477	3,039
Settlement of forward interest rate swap agreement	0	513	0
Lease termination income	0	(4,518)	0
Other noncash interest expense	(1,330)	(1,304)	(1,279)
Other, net	(695)	4,746	(407)
Changes in operating assets and liabilities
Change in accounts receivable	(4,940)	(1,071)	(336)
Change in other assets	141	(2,420)	(227)
Change in accounts payable and accrued expenses	(2,108)	5,956	(3,297)
Change in security deposits payable	(1,726)	(971)	2,274
Change in other liabilities and deferred credits	(1,206)	(3,585)	1,282
Net cash provided by operating activities	126,985	153,816	136,507
INVESTING ACTIVITIES
Acquisition of real estate, net	0	(507,780)	0
Capital expenditures	(63,488)	(88,327)	(54,411)
Proceeds from sale of real estate, net of selling costs	0	8,191	0
Leasing commissions	(5,589)	(11,267)	(9,936)
Net cash used in investing activities	(69,077)	(599,183)	(64,347)
FINANCING ACTIVITIES
Repayment of secured notes payable	(51,003)	(20,762)	(97,124)
Proceeds from unsecured line of credit	100,000	59,000	84,000
Repayment of unsecured line of credit	0	123,000	20,000
Proceeds from issuance of unsecured notes payable	0	150,000	0
Debt issuance costs	(125)	(1,103)	(2,727)
Contributions from American Assets Trust, Inc.		515,354
Contributions from American Assets Trust, Inc.	0		(236)
Dividends paid to common stock and unitholders	(76,510)	(80,605)	(70,228)
Shares withheld for employee taxes	(672)	(1,338)	(527)
Net cash provided by (used in) financing activities	(28,310)	497,546	(106,842)
Net (decrease) increase in cash and cash equivalents	29,598	52,179	(34,682)
Cash, cash equivalents and restricted cash, beginning of year	109,451	57,272	91,954
Cash, cash equivalents and restricted cash, end of year	139,049	109,451	57,272
Cash and cash equivalents	137,333	99,303	47,956
Restricted cash	$ 1,716	$ 10,148	$ 9,316