SEGMENT REPORTING Reconciliation of Segment Profit to Net Income Attributable to Stockholders (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Segment Reporting [Abstract]
Total Segments' profit	$ 40,556	$ 40,752	$ 81,863	$ 81,846
General and administrative	(4,635)	(4,426)	(9,247)	(8,627)
Depreciation and amortization	(18,209)	(16,953)	(34,550)	(33,966)
Interest expense	13,439	14,744	27,071	29,480
Other income (expense), net	1,078	(65)	1,014	(344)
NET INCOME	5,351	4,564	12,009	9,429
Net income attributable to restricted shares	(94)	(133)	(164)	(265)
Net income attributable to unitholders in the Operating Partnership	1,544	1,354	3,530	2,849
NET INCOME ATTRIBUTABLE TO AMERICAN ASSETS TRUST, INC. STOCKHOLDERS	$ 3,713	$ 3,077	$ 8,315	$ 6,315