Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
OPERATING ACTIVITIES
Net income	$ 53,915	$ 31,145	$ 22,594
Adjustments to reconcile income from continuing operations to net cash provided by operating activities:
Deferred rent revenue and amortization of lease intangibles	(5,587)	(4,623)	(4,997)
Depreciation and amortization	63,392	66,568	66,775
Amortization of debt issuance costs and debt fair value adjustments	4,214	4,075	3,932
Gain on sale of real estate	(7,121)	0	0
Stock-based compensation expense	2,877	3,666	2,845
Settlement of forward interest rate swap agreement	0	1,617	0
Other noncash interest expense	(231)	(39)	0
Other, net	878	(95)	848
Changes in operating assets and liabilities
Change in restricted cash	265	1,198	(755)
Change in accounts receivable	(1,011)	279	(45)
Change in other assets	(243)	(107)	(88)
Change in accounts payable and accrued expenses	(1,081)	1,381	1,167
Change in security deposits payable	493	358	307
Change in other liabilities and deferred credits	(36)	188	151
Net cash provided by operating activities	110,724	105,611	92,734
INVESTING ACTIVITIES
Capital expenditures	(134,174)	(144,674)	(55,675)
Proceeds from sale of real estate, net of selling costs	12,259	0	0
Change in restricted cash, reserves for capital improvements	(893)	(3,068)	453
Leasing commissions	(4,461)	(5,098)	(3,032)
Net cash used in investing activities	(127,269)	(152,840)	(58,254)
FINANCING ACTIVITIES
Change in restricted cash	0	0	(1,400)
Repayment of secured notes payable	(235,980)	(142,276)	(95,420)
Proceeds from term loan	0	100,000	0
Proceeds from unsecured line of credit	65,000	0	93,000
Repayment of unsecured line of credit	35,000	93,000	0
Proceeds from issuance of unsecured notes payable	200,000	150,000	0
Debt issuance costs	(2,881)	(2,141)	0
Proceeds from issuance of common stock, net	72,782	104,107	25,348
Dividends and distributions	(59,412)	(54,311)	(49,500)
Shares withheld for employee taxes	(7,396)	(4,780)	0
Net cash provided by (used in) financing activities	(2,887)	57,599	(27,972)
Net (decrease) increase in cash and cash equivalents	(19,432)	10,370	6,508
Cash and cash equivalents, beginning of period	59,357	48,987	42,479
Cash and cash equivalents, end of period	39,925	59,357	48,987
American Assets Trust, L.P.
OPERATING ACTIVITIES
Net income	53,915	31,145	22,594
Adjustments to reconcile income from continuing operations to net cash provided by operating activities:
Deferred rent revenue and amortization of lease intangibles	(5,587)	(4,623)	(4,997)
Depreciation and amortization	63,392	66,568	66,775
Amortization of debt issuance costs and debt fair value adjustments	4,214	4,075	3,932
Gain on sale of real estate	(7,121)	0	0
Stock-based compensation expense	2,877	3,666	2,845
Settlement of forward interest rate swap agreement	0	1,617	0
Other noncash interest expense	(231)	(39)	0
Other, net	878	(95)	848
Changes in operating assets and liabilities
Change in restricted cash	265	1,198	(755)
Change in accounts receivable	(1,011)	279	(45)
Change in other assets	(243)	(107)	(88)
Change in accounts payable and accrued expenses	(1,081)	1,381	1,167
Change in security deposits payable	493	358	307
Change in other liabilities and deferred credits	(36)	188	151
Net cash provided by operating activities	110,724	105,611	92,734
INVESTING ACTIVITIES
Capital expenditures	(134,174)	(144,674)	(55,675)
Proceeds from sale of real estate, net of selling costs	12,259	0	0
Change in restricted cash, reserves for capital improvements	(893)	(3,068)	453
Leasing commissions	(4,461)	(5,098)	(3,032)
Net cash used in investing activities	(127,269)	(152,840)	(58,254)
FINANCING ACTIVITIES
Change in restricted cash	0	0	(1,400)
Repayment of secured notes payable	(235,980)	(142,276)	(95,420)
Proceeds from term loan	0	100,000	0
Proceeds from unsecured line of credit	65,000	0	93,000
Repayment of unsecured line of credit	35,000	93,000	0
Proceeds from issuance of unsecured notes payable	200,000	150,000	0
Debt issuance costs	(2,881)	(2,141)	0
Contributions from American Assets Trust, Inc.	72,782	104,107	25,348
Dividends and distributions	(59,412)	(54,311)	(49,500)
Shares withheld for employee taxes	(7,396)	(4,780)	0
Net cash provided by (used in) financing activities	(2,887)	57,599	(27,972)
Net (decrease) increase in cash and cash equivalents	(19,432)	10,370	6,508
Cash and cash equivalents, beginning of period	59,357	48,987	42,479
Cash and cash equivalents, end of period	$ 39,925	$ 59,357	$ 48,987