Consolidated Statement of Equity (Unaudited) - 3 months ended Mar. 31, 2016 - USD ($) $ in Thousands	Total	American Assets Trust, L.P.	American Assets Trust, L.P. Accumulated Other Comprehensive Income (Loss)	American Assets Trust, L.P. Limited Partner	[1]	American Assets Trust, L.P. General Partner	[2]	Swap American Assets Trust, L.P. Accumulated Other Comprehensive Income (Loss)	Common Shares	Additional Paid-in Capital	Accumulated Dividends in Excess of Net Income	Accumulated Other Comprehensive Income (Loss)	Noncontrolling Interests - Unitholders in the Operating Partnership
Beginning Balance (in shares) at Dec. 31, 2015									45,407,719
Beginning Balance at Dec. 31, 2015	$ 828,927								$ 454	$ 863,432	$ (64,066)	$ (258)	$ 29,365
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	10,721	$ 10,721		$ 3,027		$ 7,694					7,694		3,027
Dividends declared and paid	(15,827)										(11,352)		(4,475)
Stock-based compensation	618									618
Shares withheld for employee taxes (in shares)						(317)			(317)
Shares withheld for employee taxes	(12)	(12)				$ (12)			$ 0	(12)
Other comprehensive loss - change in value of interest rate swaps	(3,969)	(3,969)						$ (3,969)				(2,844)	(1,125)
Reclassification of amortization of forward-starting swap included in interest expense	(57)	(57)	$ (57)									(41)	(16)
Ending Balance (in shares) at Mar. 31, 2016									45,407,402
Ending Balance at Mar. 31, 2016	820,401								$ 454	864,038	(67,724)	(3,143)	26,776
Beginning partners' capital account (in shares) at Dec. 31, 2015				17,899,516		45,407,719
Beginning partners' capital account at Dec. 31, 2015		828,927	(339)	$ 29,446		$ 799,820
Increase (Decrease) in Partners' Capital [Roll Forward]
Net income	10,721	10,721		3,027		7,694					$ 7,694		3,027
Distributions		(15,827)		$ (4,475)		(11,352)
Stock-based compensation		618				$ 618
Shares withheld for employee taxes (in shares)						(317)			(317)
Shares withheld for employee taxes	(12)	(12)				$ (12)			$ 0	$ (12)
Other comprehensive income (loss) - unrealized gain (loss) on swap derivative during the period	(3,969)	(3,969)						$ (3,969)				(2,844)	(1,125)
Reclassification of amortization of forward-starting swap included in interest expense	$ (57)	(57)	(57)									$ (41)	$ (16)
Ending partners' capital account (in shares) at Mar. 31, 2016				17,899,516		45,407,402
Ending partners' capital account at Mar. 31, 2016		$ 820,401	$ (4,365)	$ 27,998		$ 796,768

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

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