SEGMENT REPORTING - Reconciliation of Segment Profit to Net Income Attributable to Stockholders (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Segment Reporting [Abstract]
Total Segments' profit	$ 46,397	$ 45,645
General and administrative	(5,082)	(4,549)
Depreciation and amortization	(17,986)	(17,453)
Interest expense	13,331	12,946
Other income, net	310	24
NET INCOME	10,308	10,721
Net income attributable to restricted shares	(60)	(43)
Net income attributable to unitholders in the Operating Partnership	2,861	3,027
NET INCOME ATTRIBUTABLE TO AMERICAN ASSETS TRUST, INC. STOCKHOLDERS	$ 7,387	$ 7,651