Consolidated Balance Sheets - USD ($) $ in Thousands		Dec. 31, 2019	Dec. 31, 2018
ASSETS
Operating real estate		$ 3,096,886	$ 2,549,571
Construction in progress		91,264	71,228
Held for development		547	9,392
Total Real estate, at cost		3,188,697	2,630,191
Accumulated depreciation		(665,222)	(590,338)
Net real estate		2,523,475	2,039,853
Cash and cash equivalents		99,303	47,956
Restricted cash		10,148	9,316
Accounts receivable, net		12,016	9,289
Deferred rent receivables, net		52,171	39,815
Other assets, net		93,220	52,021
TOTAL ASSETS		2,790,333	2,198,250
LIABILITIES AND EQUITY
Secured notes payable		161,879	182,572
Unsecured notes payable		1,195,780	1,045,863
Unsecured line of credit		0	62,337
Accounts payable and accrued expenses		62,576	46,616
Security deposits payable		8,316	8,844
Other liabilities and deferred credits		68,110	49,547
Total liabilities		1,496,661	1,395,779
Commitments and contingencies (Note 12)
American Assets Trust, Inc. stockholders' equity
Common stock, $0.01 par value, 490,000,000 shares authorized, 60,068,228 and 47,335,409 shares issued and outstanding at December 31, 2019 and December 31, 2018, respectively		601	474
Additional paid-in capital		1,452,014	920,661
Accumulated dividends in excess of net income		(144,378)	(128,778)
Accumulated other comprehensive income		5,680	10,620
Total American Assets Trust, Inc. stockholders' equity		1,313,917	802,977
Noncontrolling interests		(20,245)	(506)
Total equity		1,293,672	802,471
TOTAL LIABILITIES AND EQUITY		2,790,333	2,198,250
American Assets Trust, L.P.
ASSETS
Operating real estate		3,096,886	2,549,571
Construction in progress		91,264	71,228
Held for development		547	9,392
Total Real estate, at cost		3,188,697	2,630,191
Accumulated depreciation		(665,222)	(590,338)
Net real estate		2,523,475	2,039,853
Cash and cash equivalents		99,303	47,956
Restricted cash		10,148	9,316
Accounts receivable, net		12,016	9,289
Deferred rent receivables, net		52,171	39,815
Other assets, net		93,220	52,021
TOTAL ASSETS		2,790,333	2,198,250
LIABILITIES AND EQUITY
Secured notes payable		161,879	182,572
Unsecured notes payable		1,195,780	1,045,863
Unsecured line of credit		0	62,337
Accounts payable and accrued expenses		62,576	46,616
Security deposits payable		8,316	8,844
Other liabilities and deferred credits		68,110	49,547
Total liabilities		1,496,661	1,395,779
American Assets Trust, Inc. stockholders' equity
Accumulated other comprehensive income		7,716	14,591
TOTAL LIABILITIES AND EQUITY		2,790,333	2,198,250
Partners' Capital [Abstract]
Limited partners' capital, 16,390,548 and 17,177,608 units issued and outstanding as of December 31, 2019 and December 31, 2018, respectively		(22,281)	(4,477)
General partner's capital, 60,068,228 and 47,335,409 units issued and outstanding as of December 31, 2019 and December 31, 2018, respectively		1,308,237	792,357
Total capital		1,293,672	802,471
Limited Partner | American Assets Trust, L.P.
Partners' Capital [Abstract]
Total capital	[1]	(22,281)	(4,477)
General Partner | American Assets Trust, L.P.
Partners' Capital [Abstract]
Total capital	[2]	1,308,237	792,357
Accumulated Other Comprehensive Income (Loss) | American Assets Trust, L.P.
Partners' Capital [Abstract]
Total capital		$ 7,716	$ 14,591

[1] Consists of limited partnership interests held by third parties.

[2] Consists of general and limited partnership interests held by American Assets Trust, Inc.