Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
ASSETS
Operating real estate	$ 2,536,474	$ 2,241,061
Construction in progress	68,272	50,498
Held for development	9,392	9,447
Total Real estate, at cost	2,614,138	2,301,006
Accumulated depreciation	(537,431)	(469,460)
Net real estate	2,076,707	1,831,546
Cash and cash equivalents	82,610	44,801
Restricted cash	9,344	9,950
Accounts receivable, net	9,869	9,330
Deferred rent receivables, net	38,973	38,452
Other assets, net	42,361	52,854
TOTAL ASSETS	2,259,864	1,986,933
LIABILITIES AND EQUITY
Secured notes payable	279,550	445,180
Unsecured notes payable	1,045,470	596,350
Unsecured line of credit	0	20,000
Accounts payable and accrued expenses	38,069	32,401
Security deposits payable	6,570	6,114
Other liabilities and deferred credits	46,061	48,337
Total liabilities	1,415,720	1,148,382
Commitments and contingencies (Note 12)
American Assets Trust, Inc. stockholders' equity
Common stock, $0.01 par value, 490,000,000 shares authorized, 47,204,588 and 45,732,109 shares issued and outstanding at December 31, 2017 and December 31, 2016, respectively	473	457
Additional paid-in capital	919,066	874,597
Accumulated dividends in excess of net income	(97,280)	(77,296)
Accumulated other comprehensive income (loss)	11,451	11,798
Total American Assets Trust, Inc. stockholders' equity	833,710	809,556
Noncontrolling interests	10,434	28,995
Total equity	844,144	838,551
TOTAL LIABILITIES AND EQUITY	2,259,864	1,986,933
American Assets Trust, L.P.
ASSETS
Operating real estate	2,536,474	2,241,061
Construction in progress	68,272	50,498
Held for development	9,392	9,447
Total Real estate, at cost	2,614,138	2,301,006
Accumulated depreciation	(537,431)	(469,460)
Net real estate	2,076,707	1,831,546
Cash and cash equivalents	82,610	44,801
Restricted cash	9,344	9,950
Accounts receivable, net	9,869	9,330
Deferred rent receivables, net	38,973	38,452
Other assets, net	42,361	52,854
TOTAL ASSETS	2,259,864	1,986,933
LIABILITIES AND EQUITY
Secured notes payable	279,550	445,180
Unsecured notes payable	1,045,470	596,350
Unsecured line of credit	0	20,000
Accounts payable and accrued expenses	38,069	32,401
Security deposits payable	6,570	6,114
Other liabilities and deferred credits	46,061	48,337
Total liabilities	1,415,720	1,148,382
American Assets Trust, Inc. stockholders' equity
Accumulated other comprehensive income (loss)	15,750	16,478
TOTAL LIABILITIES AND EQUITY	2,259,864	1,986,933
Partners' Capital [Abstract]
Limited partners' capital, 17,194,980 and 17,888,822 units issued and outstanding as of December 31, 2017 and December 31, 2016, respectively	6,135	24,315
General partner's capital, 47,204,588 and 45,732,109 units issued and outstanding as of December 31, 2017 and December 31, 2016, respectively	822,259	797,758
Total capital	$ 844,144	$ 838,551