SEGMENT REPORTING Reconciliation of Segment Profit to Net Income Attributable to Stockholders (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Segment Reporting [Abstract]
Total Segments' profit	$ 41,307	$ 41,094
General and administrative	(4,612)	(4,201)
Depreciation and amortization	(16,341)	(17,013)
Interest expense	13,632	14,736
Other income (expense), net	(64)	(279)
NET INCOME	6,658	4,865
Net income attributable to restricted shares	(70)	(132)
Net income attributable to unitholders in the Operating Partnership	1,986	1,495
NET INCOME ATTRIBUTABLE TO AMERICAN ASSETS TRUST, INC. STOCKHOLDERS	$ 4,602	$ 3,238