Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
ASSETS
Operating real estate	$ 1,951,039	$ 1,931,698
Construction in progress	259,879	195,736
Held for development	9,418	9,390
Total Real estate, at cost	2,220,336	2,136,824
Accumulated depreciation	(386,622)	(361,424)
Net real estate	1,833,714	1,775,400
Cash and cash equivalents	34,949	59,357
Restricted cash	11,311	10,994
Accounts receivable, net	5,721	6,727
Deferred rent receivables, net	37,008	35,883
Other assets, net	51,610	53,401
TOTAL ASSETS	1,974,313	1,941,762
LIABILITIES AND EQUITY
Secured notes payable	579,133	812,811
Unsecured notes payable	450,000	250,000
Unsecured line of credit	30,000	0
Accounts payable and accrued expenses	45,116	50,861
Security deposits payable	5,900	5,521
Other liabilities and deferred credits, net	53,882	55,993
Total liabilities	$ 1,164,031	$ 1,175,186
Commitments and contingencies (Note 11)
American Assets Trust, Inc. stockholders’ equity
Common stock, $0.01 par value, 490,000,000 shares authorized, 44,909,930 and 43,701,669 shares issued and outstanding at June 30, 2015 and December 31, 2014, respectively	$ 449	$ 437
Additional paid-in capital	844,639	795,065
Accumulated dividends in excess of net income	(64,024)	(60,291)
Accumulated other comprehensive (loss) income	(339)	92
Total American Assets Trust, Inc. stockholders’ equity	780,725	735,303
Noncontrolling interests	29,557	31,273
Total equity	810,282	766,576
TOTAL LIABILITIES AND EQUITY	1,974,313	1,941,762
American Assets Trust, L.P.
ASSETS
Operating real estate	1,951,039	1,931,698
Construction in progress	259,879	195,736
Held for development	9,418	9,390
Total Real estate, at cost	2,220,336	2,136,824
Accumulated depreciation	(386,622)	(361,424)
Net real estate	1,833,714	1,775,400
Cash and cash equivalents	34,949	59,357
Restricted cash	11,311	10,994
Accounts receivable, net	5,721	6,727
Deferred rent receivables, net	37,008	35,883
Other assets, net	51,610	53,401
TOTAL ASSETS	1,974,313	1,941,762
LIABILITIES AND EQUITY
Secured notes payable	579,133	812,811
Unsecured notes payable	450,000	250,000
Unsecured line of credit	30,000	0
Accounts payable and accrued expenses	45,116	50,861
Security deposits payable	5,900	5,521
Other liabilities and deferred credits, net	53,882	55,993
Total liabilities	$ 1,164,031	$ 1,175,186
Commitments and contingencies (Note 11)
American Assets Trust, Inc. stockholders’ equity
Accumulated other comprehensive (loss) income	$ (472)	$ 130
TOTAL LIABILITIES AND EQUITY	1,974,313	1,941,762
Partners' Capital [Abstract]
Limited Partners' Capital Account	29,690	31,235
General Partners' Capital Account	781,064	735,211
Partners' Capital	$ 810,282	$ 766,576