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OTHER ASSETS (Parenthetical) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]    
Leasing commissions, accumulative amortization $ 21,392us-gaap_DeferredCostsLeasingAccumulatedAmortization $ 20,659us-gaap_DeferredCostsLeasingAccumulatedAmortization
Lease incentives, accumulated amortization 3,053aat_LeaseIncentiveAccumulatedAmortization 2,960aat_LeaseIncentiveAccumulatedAmortization
Other intangible assets, accumulated amortization 1,612us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization 1,590us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
Debt issuance costs, accumulated amortization $ 4,416us-gaap_AccumulatedAmortizationDeferredFinanceCosts $ 4,147us-gaap_AccumulatedAmortizationDeferredFinanceCosts