SEGMENT REPORTING - Reconciliation of Segment Profit to Net Income Attributable to Stockholders (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Segment Reporting [Abstract]
Total Segments' profit	$ 45,645	$ 43,367
General and administrative	(4,549)	(5,016)
Depreciation and amortization	(17,453)	(15,107)
Interest expense	12,946	11,795
Other income (expense), net	24	(70)
NET INCOME	10,721	11,379
Net income attributable to restricted shares	(43)	(43)
Net income attributable to unitholders in the Operating Partnership	3,027	3,309
NET INCOME ATTRIBUTABLE TO AMERICAN ASSETS TRUST, INC. STOCKHOLDERS	$ 7,651	$ 8,027