$AAT
American Assets Trust, Inc. Stock $aat

$aat Overview Financials Valuation SEC Filings Company Website

2018 Q4 Form 10-K Financial Statement

#000150021720000010 Filed on February 14, 2020

Income Statement

Concept	2018 Q4	2018 Q3	2018 Q2
Revenue	$82.61M	$82.51M	$85.02M
YoY Change	1.05%	0.2%	10.27%
Cost Of Revenue	$32.81M	$30.17M	$29.51M
YoY Change	3.08%	1.55%	6.34%
Gross Profit	$49.80M	$52.34M	$55.51M
YoY Change	-0.24%	-0.55%	12.46%
Gross Profit Margin	60.29%	63.43%	65.29%
Selling, General & Admin	$6.650M	$5.658M	$5.899M
YoY Change	7.09%	3.55%	5.47%
% of Gross Profit	13.35%	10.81%	10.63%
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$21.10M	$19.90M	$32.80M
YoY Change	6.03%	-6.13%	35.54%
% of Gross Profit	42.37%	38.02%	59.09%
Operating Expenses	$27.70M	$55.23M	$67.77M
YoY Change	6.05%	-1.13%	18.78%
Operating Profit	$22.09M	$27.28M	$17.25M
YoY Change	-7.15%	3.01%	-13.96%
Interest Expense	-$12.83M	$12.88M	$12.69M
YoY Change	-7.16%	-7.16%	0.28%
% of Operating Profit	-58.08%	47.22%	73.56%
Other Income/Expense, Net	-$50.00K	-$125.0K	-$148.0K
YoY Change	-80.0%	26.26%	-177.08%
Pretax Income	$9.210M	$14.27M	$4.410M
YoY Change	-5.34%	14.07%	-41.9%
Income Tax		$171.0K	$171.0K
% Of Pretax Income		1.2%	3.88%
Net Earnings	$6.673M	$10.39M	$3.072M
YoY Change	-5.71%	14.3%	-44.34%
Net Earnings / Revenue	8.08%	12.6%	3.61%
Basic Earnings Per Share		$0.22	$0.07
Diluted Earnings Per Share	$143.6K	$0.22	$0.07
COMMON SHARES
Basic Shares Outstanding	47.22M shares	46.96M shares	46.94M shares
Diluted Shares Outstanding		64.14M shares	64.13M shares

Balance Sheet

Concept	2018 Q4	2018 Q3	2018 Q2
SHORT-TERM ASSETS
Cash & Short-Term Investments	$48.00M	$56.20M	$51.30M
YoY Change	-41.89%	-40.34%	63.38%
Cash & Equivalents	$47.96M	$56.22M	$51.33M
Short-Term Investments
Other Short-Term Assets	$6.700M	$5.900M	$5.200M
YoY Change	13.56%	1.72%	1.96%
Inventory
Prepaid Expenses
Receivables	$9.300M	$8.300M	$7.100M
Other Receivables	$0.00	$0.00	$0.00
Total Short-Term Assets	$64.00M	$70.40M	$63.60M
YoY Change	-34.96%	-35.17%	47.91%
LONG-TERM ASSETS
Property, Plant & Equipment	$2.040B	$2.036B	$2.034B
YoY Change	-1.77%	-2.22%	-0.59%
Goodwill
YoY Change
Intangibles
YoY Change
Long-Term Investments
YoY Change
Other Assets	$9.300M	$9.900M	$9.400M
YoY Change	0.0%	-1.98%	2.17%
Total Long-Term Assets	$2.134B	$2.126B	$2.122B
YoY Change	-1.26%	-1.88%	-0.27%
TOTAL ASSETS
Total Short-Term Assets	$64.00M	$70.40M	$63.60M
Total Long-Term Assets	$2.134B	$2.126B	$2.122B
Total Assets	$2.198B	$2.197B	$2.186B
YoY Change	-2.73%	-3.46%	0.68%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$46.60M	$54.60M	$39.70M
YoY Change	22.31%	13.51%	-2.93%
Accrued Expenses
YoY Change
Deferred Revenue
YoY Change
Short-Term Debt	$0.00	$0.00	$0.00
YoY Change
Long-Term Debt Due
YoY Change
Total Short-Term Liabilities	$55.40M	$63.30M	$48.40M
YoY Change	23.94%	15.51%	1.47%
LONG-TERM LIABILITIES
Long-Term Debt	$1.291B	$1.271B	$1.271B
YoY Change	-2.58%	-4.08%	3.73%
Other Long-Term Liabilities	$49.50M	$47.20M	$49.20M
YoY Change	7.84%	0.0%	7.19%
Total Long-Term Liabilities	$1.340B	$1.318B	$1.320B
YoY Change	-2.23%	-3.94%	3.86%
TOTAL LIABILITIES
Total Short-Term Liabilities	$55.40M	$63.30M	$48.40M
Total Long-Term Liabilities	$1.340B	$1.318B	$1.320B
Total Liabilities	$1.396B	$1.381B	$1.368B
YoY Change	-1.41%	-3.21%	3.76%
SHAREHOLDERS EQUITY
Retained Earnings	-$128.8M	-$122.3M	-$120.0M
YoY Change	32.38%	33.37%	35.46%
Common Stock	$921.1M	$920.8M	$920.1M
YoY Change	0.17%	0.33%	0.32%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$803.0M	$812.4M	$813.8M
YoY Change
Total Liabilities & Shareholders Equity	$2.198B	$2.197B	$2.186B
YoY Change	-2.73%	-3.46%	0.68%

Cashflow Statement

Concept	2018 Q4	2018 Q3	2018 Q2
OPERATING ACTIVITIES
Net Income	$6.673M	$10.39M	$3.072M
YoY Change	-5.71%	14.3%	-44.34%
Depreciation, Depletion And Amortization	$21.10M	$19.90M	$32.80M
YoY Change	6.03%	-6.13%	35.54%
Cash From Operating Activities	$17.60M	$36.60M	$38.30M
YoY Change	-12.87%	-14.29%	8.81%
INVESTING ACTIVITIES
Capital Expenditures	-$22.70M	-$11.30M	-$10.30M
YoY Change	78.74%	-81.17%	-95.72%
Acquisitions
YoY Change
Other Investing Activities	-$4.800M	-$2.000M	-$1.900M
YoY Change	300.0%	25.0%	72.73%
Cash From Investing Activities	-$27.50M	-$13.40M	-$12.00M
YoY Change	96.43%	-78.25%	-95.04%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	1.100M	-17.70M	-30.90M
YoY Change	-105.88%	-121.4%	-165.47%
NET CHANGE
Cash From Operating Activities	17.60M	36.60M	38.30M
Cash From Investing Activities	-27.50M	-13.40M	-12.00M
Cash From Financing Activities	1.100M	-17.70M	-30.90M
Net Change In Cash	-8.800M	5.500M	-4.600M
YoY Change	-29.6%	-91.38%	-97.11%
FREE CASH FLOW
Cash From Operating Activities	$17.60M	$36.60M	$38.30M
Capital Expenditures	-$22.70M	-$11.30M	-$10.30M
Free Cash Flow	$40.30M	$47.90M	$48.60M
YoY Change	22.49%	-53.36%	-82.38%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2017	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-901000	USD
CY2018	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	3039000	USD
CY2018Q4	aat	Lease Incentive Accumulated Amortization LeaseIncentiveAccumulatedAmortization	299000	USD
CY2019Q4	aat	Lease Incentive Accumulated Amortization LeaseIncentiveAccumulatedAmortization	565000	USD
CY2018	aat	Maximum Percentage Of Revenue Provided By Any Single Tenant MaximumPercentageOfRevenueProvidedByAnySingleTenant	0.10
CY2019	dei	Amendment Flag AmendmentFlag	false
CY2019	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2019	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2019	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2019
CY2019	dei	Entity Central Index Key EntityCentralIndexKey	0001500217
CY2018Q4	us-gaap	Accumulated Amortization Deferred Finance Costs AccumulatedAmortizationDeferredFinanceCosts	0	USD
CY2019Q4	us-gaap	Accumulated Amortization Deferred Finance Costs AccumulatedAmortizationDeferredFinanceCosts	814000	USD
CY2018Q4	us-gaap	Deferred Costs Leasing Accumulated Amortization DeferredCostsLeasingAccumulatedAmortization	28597000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	1031000	USD
CY2019Q4	us-gaap	Deferred Costs Leasing Accumulated Amortization DeferredCostsLeasingAccumulatedAmortization	30775000	USD
CY2018Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	981000	USD
CY2019Q4	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	0	shares
CY2018	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Plan Modification Incremental Compensation Cost ShareBasedCompensationArrangementByShareBasedPaymentAwardPlanModificationIncrementalCompensationCost	0	USD
CY2019	dei	Document Type DocumentType	10-K
CY2019	dei	Document Annual Report DocumentAnnualReport	true
CY2019	dei	Document Period End Date DocumentPeriodEndDate	2019-12-31
CY2019	dei	Document Transition Report DocumentTransitionReport	false
CY2019	dei	Entity Registrant Name EntityRegistrantName	AMERICAN ASSETS TRUST, INC.
CY2019	dei	Entity File Number EntityFileNumber	001-35030
CY2019	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	MD
CY2019	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	27-3338708
CY2019	dei	Entity Address Address Line1 EntityAddressAddressLine1	11455 El Camino Real
CY2019	dei	Entity Address Address Line2 EntityAddressAddressLine2	Suite 200
CY2019	dei	Entity Address City Or Town EntityAddressCityOrTown	San Diego
CY2019	dei	Entity Address State Or Province EntityAddressStateOrProvince	CA
CY2019	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	92130
CY2019	dei	City Area Code CityAreaCode	858
CY2019	dei	Local Phone Number LocalPhoneNumber	350-2600
CY2019	dei	Security12b Title Security12bTitle	Common Stock, $.01 par value per share
CY2019	dei	Trading Symbol TradingSymbol	AAT
CY2019	dei	Security Exchange Name SecurityExchangeName	NYSE
CY2019	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes
CY2019	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2019	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2019	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
CY2019	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2019	dei	Entity Small Business EntitySmallBusiness	false
CY2019	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
CY2019	dei	Entity Shell Company EntityShellCompany	false
CY2019Q2	dei	Entity Public Float EntityPublicFloat	2491000000	USD
CY2020Q1	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	60068228	shares
CY2019Q4	us-gaap	Rental Properties RentalProperties	3096886000	USD
CY2018Q4	us-gaap	Rental Properties RentalProperties	2549571000	USD
CY2019Q4	us-gaap	Construction In Progress Gross ConstructionInProgressGross	91264000	USD
CY2018Q4	us-gaap	Construction In Progress Gross ConstructionInProgressGross	71228000	USD
CY2019Q4	us-gaap	Land Available For Development LandAvailableForDevelopment	547000	USD
CY2018Q4	us-gaap	Land Available For Development LandAvailableForDevelopment	9392000	USD
CY2019Q4	us-gaap	Real Estate Investment Property At Cost RealEstateInvestmentPropertyAtCost	3188697000	USD
CY2018Q4	us-gaap	Real Estate Investment Property At Cost RealEstateInvestmentPropertyAtCost	2630191000	USD
CY2019Q4	us-gaap	Real Estate Investment Property Accumulated Depreciation RealEstateInvestmentPropertyAccumulatedDepreciation	665222000	USD
CY2018Q4	us-gaap	Real Estate Investment Property Accumulated Depreciation RealEstateInvestmentPropertyAccumulatedDepreciation	590338000	USD
CY2019Q4	us-gaap	Real Estate Investment Property Net RealEstateInvestmentPropertyNet	2523475000	USD
CY2018Q4	us-gaap	Real Estate Investment Property Net RealEstateInvestmentPropertyNet	2039853000	USD
CY2019Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	99303000	USD
CY2018Q4	us-gaap	Deferred Rent Receivables Net DeferredRentReceivablesNet	39815000	USD
CY2018Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	47956000	USD
CY2019Q4	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	10148000	USD
CY2018Q4	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	9316000	USD
CY2019Q4	us-gaap	Accounts Receivable Net AccountsReceivableNet	12016000	USD
CY2018Q4	us-gaap	Accounts Receivable Net AccountsReceivableNet	9289000	USD
CY2019Q4	us-gaap	Deferred Rent Receivables Net DeferredRentReceivablesNet	52171000	USD
CY2019Q4	us-gaap	Other Assets OtherAssets	93220000	USD
CY2018Q4	us-gaap	Other Assets OtherAssets	52021000	USD
CY2019Q4	us-gaap	Assets Assets	2790333000	USD
CY2018Q4	us-gaap	Assets Assets	2198250000	USD
CY2019Q4	us-gaap	Secured Debt SecuredDebt	161879000	USD
CY2018Q4	us-gaap	Secured Debt SecuredDebt	182572000	USD
CY2019Q4	us-gaap	Unsecured Debt UnsecuredDebt	1195780000	USD
CY2018Q4	us-gaap	Unsecured Debt UnsecuredDebt	1045863000	USD
CY2019Q4	us-gaap	Line Of Credit LineOfCredit	0	USD
CY2018Q4	us-gaap	Line Of Credit LineOfCredit	62337000	USD
CY2019Q4	us-gaap	Accounts Payable And Accrued Liabilities Current And Noncurrent AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent	62576000	USD
CY2018Q4	us-gaap	Accounts Payable And Accrued Liabilities Current And Noncurrent AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent	46616000	USD
CY2019Q4	us-gaap	Security Deposit Liability SecurityDepositLiability	8316000	USD
CY2018Q4	us-gaap	Security Deposit Liability SecurityDepositLiability	8844000	USD
CY2019Q4	us-gaap	Deferred Credits And Other Liabilities DeferredCreditsAndOtherLiabilities	68110000	USD
CY2018Q4	us-gaap	Deferred Credits And Other Liabilities DeferredCreditsAndOtherLiabilities	49547000	USD
CY2019Q4	us-gaap	Liabilities Liabilities	1496661000	USD
CY2018Q4	us-gaap	Liabilities Liabilities	1395779000	USD
CY2019Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2018Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2019Q4	us-gaap	Common Stock Value CommonStockValue	601000	USD
CY2018Q4	us-gaap	Common Stock Value CommonStockValue	474000	USD
CY2019Q4	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	1452014000	USD
CY2018Q4	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	920661000	USD
CY2019Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	-144378000	USD
CY2018Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	-128778000	USD
CY2019Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	5680000	USD
CY2018Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	10620000	USD
CY2019Q4	us-gaap	Stockholders Equity StockholdersEquity	1313917000	USD
CY2018Q4	us-gaap	Stockholders Equity StockholdersEquity	802977000	USD
CY2019Q4	us-gaap	Minority Interest MinorityInterest	-20245000	USD
CY2018Q4	us-gaap	Minority Interest MinorityInterest	-506000	USD
CY2019Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	1293672000	USD
CY2018Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	802471000	USD
CY2019Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	2790333000	USD
CY2018Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	2198250000	USD
CY2019	us-gaap	Operating Leases Income Statement Lease Revenue OperatingLeasesIncomeStatementLeaseRevenue	343865000	USD
CY2018	us-gaap	Operating Leases Income Statement Lease Revenue OperatingLeasesIncomeStatementLeaseRevenue	309537000	USD
CY2017	us-gaap	Operating Leases Income Statement Lease Revenue OperatingLeasesIncomeStatementLeaseRevenue	298803000	USD
CY2019	us-gaap	Other Operating Income OtherOperatingIncome	22876000	USD
CY2018	us-gaap	Other Operating Income OtherOperatingIncome	21330000	USD
CY2017	us-gaap	Other Operating Income OtherOperatingIncome	16180000	USD
CY2019	us-gaap	Revenues Revenues	366741000	USD
CY2018	us-gaap	Revenues Revenues	330867000	USD
CY2017	us-gaap	Revenues Revenues	314983000	USD
CY2019	us-gaap	Cost Of Other Property Operating Expense CostOfOtherPropertyOperatingExpense	91967000	USD
CY2018	us-gaap	Cost Of Other Property Operating Expense CostOfOtherPropertyOperatingExpense	86482000	USD
CY2017	us-gaap	Cost Of Other Property Operating Expense CostOfOtherPropertyOperatingExpense	84006000	USD
CY2019	us-gaap	Real Estate Tax Expense RealEstateTaxExpense	40013000	USD
CY2018	us-gaap	Real Estate Tax Expense RealEstateTaxExpense	34973000	USD
CY2017	us-gaap	Real Estate Tax Expense RealEstateTaxExpense	32671000	USD
CY2019	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	24871000	USD
CY2018	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	22784000	USD
CY2017	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	21382000	USD
CY2019	us-gaap	Depreciation And Amortization DepreciationAndAmortization	96205000	USD
CY2018	us-gaap	Depreciation And Amortization DepreciationAndAmortization	107093000	USD
CY2017	us-gaap	Depreciation And Amortization DepreciationAndAmortization	83278000	USD
CY2019	us-gaap	Operating Expenses OperatingExpenses	253056000	USD
CY2018	us-gaap	Operating Expenses OperatingExpenses	251332000	USD
CY2017	us-gaap	Operating Expenses OperatingExpenses	221337000	USD
CY2019	us-gaap	Operating Income Loss OperatingIncomeLoss	113685000	USD
CY2018	us-gaap	Operating Income Loss OperatingIncomeLoss	79535000	USD
CY2017	us-gaap	Operating Income Loss OperatingIncomeLoss	93646000	USD
CY2019	us-gaap	Interest Expense InterestExpense	54008000	USD
CY2018	us-gaap	Interest Expense InterestExpense	52248000	USD
CY2017	us-gaap	Interest Expense InterestExpense	53848000	USD
CY2019	us-gaap	Gain Loss On Sale Of Properties GainLossOnSaleOfProperties	633000	USD
CY2018	us-gaap	Gain Loss On Sale Of Properties GainLossOnSaleOfProperties	0	USD
CY2017	us-gaap	Gain Loss On Sale Of Properties GainLossOnSaleOfProperties	0	USD
CY2019	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-122000	USD
CY2018	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-85000	USD
CY2017	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	334000	USD
CY2019	us-gaap	Profit Loss ProfitLoss	60188000	USD
CY2018	us-gaap	Profit Loss ProfitLoss	27202000	USD
CY2017	us-gaap	Profit Loss ProfitLoss	40132000	USD
CY2019	aat	Net Income Attributable To Restricted Share NetIncomeAttributableToRestrictedShare	381000	USD
CY2018	aat	Net Income Attributable To Restricted Share NetIncomeAttributableToRestrictedShare	311000	USD
CY2017	aat	Net Income Attributable To Restricted Share NetIncomeAttributableToRestrictedShare	241000	USD
CY2019	us-gaap	Noncontrolling Interest In Net Income Loss Operating Partnerships Redeemable NoncontrollingInterestInNetIncomeLossOperatingPartnershipsRedeemable	14089000	USD
CY2018	us-gaap	Noncontrolling Interest In Net Income Loss Operating Partnerships Redeemable NoncontrollingInterestInNetIncomeLossOperatingPartnershipsRedeemable	7205000	USD
CY2017	us-gaap	Noncontrolling Interest In Net Income Loss Operating Partnerships Redeemable NoncontrollingInterestInNetIncomeLossOperatingPartnershipsRedeemable	10814000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	45718000	USD
CY2017	us-gaap	Net Income Loss NetIncomeLoss	29077000	USD
CY2019	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.84
CY2018	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.42
CY2017	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.62
CY2018	us-gaap	Net Income Loss NetIncomeLoss	19686000	USD
CY2019	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	54110949	shares
CY2018	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	46950812	shares
CY2017	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	46715520	shares
CY2019	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.84
CY2018	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.42
CY2017	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.62
CY2019	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	70786132	shares
CY2018	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	64136559	shares
CY2017	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	64087250	shares
CY2019	us-gaap	Profit Loss ProfitLoss	60188000	USD
CY2018	us-gaap	Profit Loss ProfitLoss	27202000	USD
CY2017	us-gaap	Profit Loss ProfitLoss	40132000	USD
CY2019	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	-5571000	USD
CY2018	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	120000	USD
CY2017	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	386000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax	1304000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax	1279000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax	1114000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	53313000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	26043000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	39404000	USD
CY2019	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	12301000	USD
CY2018	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	6877000	USD
CY2017	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	10433000	USD
CY2019	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	41012000	USD
CY2018	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	19166000	USD
CY2017	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	28971000	USD
CY2016Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	838551000	USD
CY2017	us-gaap	Profit Loss ProfitLoss	40132000	USD
CY2017	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	29873000	USD
CY2017	us-gaap	Stock Issued During Period Value Restricted Stock Award Gross StockIssuedDuringPeriodValueRestrictedStockAwardGross	0	USD
CY2017	us-gaap	Stock Issued During Period Value Restricted Stock Award Forfeitures StockIssuedDuringPeriodValueRestrictedStockAwardForfeitures	0	USD
CY2017	us-gaap	Stock Issued During Period Value Conversion Of Units StockIssuedDuringPeriodValueConversionOfUnits	0	USD
CY2017	us-gaap	Dividends Dividends	67537000	USD
CY2017	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	4735000	USD
CY2017	us-gaap	Adjustments Related To Tax Withholding For Share Based Compensation AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation	882000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax	1114000	USD
CY2017Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	844144000	USD
CY2018	us-gaap	Profit Loss ProfitLoss	27202000	USD
CY2018	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	0	USD
CY2018	us-gaap	Stock Issued During Period Value Restricted Stock Award Gross StockIssuedDuringPeriodValueRestrictedStockAwardGross	0	USD
CY2018	us-gaap	Adjustments Related To Tax Withholding For Share Based Compensation AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation	527000	USD
CY2018	us-gaap	Stock Issued During Period Value Restricted Stock Award Forfeitures StockIssuedDuringPeriodValueRestrictedStockAwardForfeitures	0	USD
CY2018	us-gaap	Stock Issued During Period Value Conversion Of Units StockIssuedDuringPeriodValueConversionOfUnits	0	USD
CY2018	us-gaap	Dividends Dividends	70228000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax	1279000	USD
CY2018Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	802471000	USD
CY2019	us-gaap	Profit Loss ProfitLoss	60188000	USD
CY2019	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	515354000	USD
CY2019	us-gaap	Stock Issued During Period Value Restricted Stock Award Gross StockIssuedDuringPeriodValueRestrictedStockAwardGross	0	USD
CY2019	us-gaap	Stock Issued During Period Value Restricted Stock Award Forfeitures StockIssuedDuringPeriodValueRestrictedStockAwardForfeitures	0	USD
CY2019	us-gaap	Stock Issued During Period Value Conversion Of Units StockIssuedDuringPeriodValueConversionOfUnits	0	USD
CY2019	us-gaap	Dividends Dividends	80605000	USD
CY2019	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	4477000	USD
CY2019	us-gaap	Adjustments Related To Tax Withholding For Share Based Compensation AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation	1338000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax	1304000	USD
CY2019Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	1293672000	USD
CY2019	us-gaap	Profit Loss ProfitLoss	60188000	USD
CY2018	us-gaap	Profit Loss ProfitLoss	27202000	USD
CY2017	us-gaap	Profit Loss ProfitLoss	40132000	USD
CY2019	aat	Deferred Rent Revenue And Amortization Of Lease Intangibles DeferredRentRevenueAndAmortizationOfLeaseIntangibles	-6985000	USD
CY2018	aat	Deferred Rent Revenue And Amortization Of Lease Intangibles DeferredRentRevenueAndAmortizationOfLeaseIntangibles	-1157000	USD
CY2017	aat	Deferred Rent Revenue And Amortization Of Lease Intangibles DeferredRentRevenueAndAmortizationOfLeaseIntangibles	-2547000	USD
CY2019	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	96205000	USD
CY2018	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	107093000	USD
CY2017	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	83278000	USD
CY2019	aat	Amortization Of Debt Issuance Costs And Debt Fair Value Adjustments AmortizationOfDebtIssuanceCostsAndDebtFairValueAdjustments	1467000	USD
CY2018	aat	Amortization Of Debt Issuance Costs And Debt Fair Value Adjustments AmortizationOfDebtIssuanceCostsAndDebtFairValueAdjustments	1530000	USD
CY2017	aat	Amortization Of Debt Issuance Costs And Debt Fair Value Adjustments AmortizationOfDebtIssuanceCostsAndDebtFairValueAdjustments	3058000	USD
CY2019	us-gaap	Gain Loss On Sale Of Properties GainLossOnSaleOfProperties	633000	USD
CY2018	us-gaap	Gain Loss On Sale Of Properties GainLossOnSaleOfProperties	0	USD
CY2017	us-gaap	Gain Loss On Sale Of Properties GainLossOnSaleOfProperties	0	USD
CY2019	us-gaap	Share Based Compensation ShareBasedCompensation	4477000	USD
CY2018	us-gaap	Share Based Compensation ShareBasedCompensation	3039000	USD
CY2017	us-gaap	Share Based Compensation ShareBasedCompensation	4735000	USD
CY2019	aat	Settlementof Forward Interest Rate Swap Agreement SettlementofForwardInterestRateSwapAgreement	513000	USD
CY2018	aat	Settlementof Forward Interest Rate Swap Agreement SettlementofForwardInterestRateSwapAgreement	0	USD
CY2017	aat	Settlementof Forward Interest Rate Swap Agreement SettlementofForwardInterestRateSwapAgreement	10667000	USD
CY2019	us-gaap	Gain Loss On Termination Of Lease GainLossOnTerminationOfLease	4518000	USD
CY2018	us-gaap	Gain Loss On Termination Of Lease GainLossOnTerminationOfLease	0	USD
CY2017	us-gaap	Gain Loss On Termination Of Lease GainLossOnTerminationOfLease	0	USD
CY2019	aat	Other Noncash Interest Expense OtherNoncashInterestExpense	1304000	USD
CY2018	aat	Other Noncash Interest Expense OtherNoncashInterestExpense	1279000	USD
CY2017	aat	Other Noncash Interest Expense OtherNoncashInterestExpense	1114000	USD
CY2019	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-6497000	USD
CY2018	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-383000	USD
CY2019	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	1071000	USD
CY2018	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	336000	USD
CY2017	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	1116000	USD
CY2019	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	2420000	USD
CY2018	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	227000	USD
CY2017	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	499000	USD
CY2019	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	5956000	USD
CY2018	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	-3297000	USD
CY2017	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	7632000	USD
CY2019	aat	Increase Decreasein Security Deposits Payable IncreaseDecreaseinSecurityDepositsPayable	-971000	USD
CY2018	aat	Increase Decreasein Security Deposits Payable IncreaseDecreaseinSecurityDepositsPayable	2274000	USD
CY2017	aat	Increase Decreasein Security Deposits Payable IncreaseDecreaseinSecurityDepositsPayable	456000	USD
CY2019	us-gaap	Increase Decrease In Other Deferred Liability IncreaseDecreaseInOtherDeferredLiability	-3585000	USD
CY2018	us-gaap	Increase Decrease In Other Deferred Liability IncreaseDecreaseInOtherDeferredLiability	1282000	USD
CY2017	us-gaap	Increase Decrease In Other Deferred Liability IncreaseDecreaseInOtherDeferredLiability	270000	USD
CY2019	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	153816000	USD
CY2018	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	136507000	USD
CY2017	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	145853000	USD
CY2019	us-gaap	Payments To Acquire Real Estate PaymentsToAcquireRealEstate	507780000	USD
CY2018	us-gaap	Payments To Acquire Real Estate PaymentsToAcquireRealEstate	0	USD
CY2017	us-gaap	Payments To Acquire Real Estate PaymentsToAcquireRealEstate	278141000	USD
CY2019	us-gaap	Payments For Capital Improvements PaymentsForCapitalImprovements	88327000	USD
CY2018	us-gaap	Payments For Capital Improvements PaymentsForCapitalImprovements	54411000	USD
CY2017	us-gaap	Payments For Capital Improvements PaymentsForCapitalImprovements	47496000	USD
CY2019	us-gaap	Proceeds From Sale Of Real Estate Heldforinvestment ProceedsFromSaleOfRealEstateHeldforinvestment	8191000	USD
CY2018	us-gaap	Proceeds From Sale Of Real Estate Heldforinvestment ProceedsFromSaleOfRealEstateHeldforinvestment	0	USD
CY2017	us-gaap	Proceeds From Sale Of Real Estate Heldforinvestment ProceedsFromSaleOfRealEstateHeldforinvestment	0	USD
CY2019	us-gaap	Increase Decrease In Lease Acquisition Costs IncreaseDecreaseInLeaseAcquisitionCosts	11267000	USD
CY2018	us-gaap	Increase Decrease In Lease Acquisition Costs IncreaseDecreaseInLeaseAcquisitionCosts	9936000	USD
CY2019	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-599183000	USD
CY2017	us-gaap	Increase Decrease In Lease Acquisition Costs IncreaseDecreaseInLeaseAcquisitionCosts	4927000	USD
CY2018	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-64347000	USD
CY2017	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-330564000	USD
CY2019	us-gaap	Repayments Of Secured Debt RepaymentsOfSecuredDebt	20762000	USD
CY2018	us-gaap	Repayments Of Secured Debt RepaymentsOfSecuredDebt	97124000	USD
CY2017	us-gaap	Repayments Of Secured Debt RepaymentsOfSecuredDebt	167139000	USD
CY2019	us-gaap	Proceeds From Unsecured Lines Of Credit ProceedsFromUnsecuredLinesOfCredit	59000000	USD
CY2018	us-gaap	Proceeds From Unsecured Lines Of Credit ProceedsFromUnsecuredLinesOfCredit	84000000	USD
CY2017	us-gaap	Proceeds From Unsecured Lines Of Credit ProceedsFromUnsecuredLinesOfCredit	173000000	USD
CY2019	us-gaap	Repayments Of Lines Of Credit RepaymentsOfLinesOfCredit	123000000	USD
CY2018	us-gaap	Repayments Of Lines Of Credit RepaymentsOfLinesOfCredit	20000000	USD
CY2017	us-gaap	Repayments Of Lines Of Credit RepaymentsOfLinesOfCredit	193000000	USD
CY2019	us-gaap	Proceeds From Issuance Of Senior Long Term Debt ProceedsFromIssuanceOfSeniorLongTermDebt	150000000	USD
CY2018	us-gaap	Proceeds From Issuance Of Senior Long Term Debt ProceedsFromIssuanceOfSeniorLongTermDebt	0	USD
CY2017	us-gaap	Proceeds From Issuance Of Senior Long Term Debt ProceedsFromIssuanceOfSeniorLongTermDebt	450000000	USD
CY2019	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	1103000	USD
CY2018	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	2727000	USD
CY2017	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	2401000	USD
CY2019	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	515354000	USD
CY2018	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	-236000	USD
CY2017	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	29873000	USD
CY2019	us-gaap	Payments Of Dividends PaymentsOfDividends	80605000	USD
CY2018	us-gaap	Payments Of Dividends PaymentsOfDividends	70228000	USD
CY2017	us-gaap	Payments Of Dividends PaymentsOfDividends	67537000	USD
CY2019	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	1338000	USD
CY2018	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	527000	USD
CY2017	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	882000	USD
CY2019	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	497546000	USD
CY2018	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-106842000	USD
CY2017	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	221914000	USD
CY2019	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	52179000	USD
CY2018	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-34682000	USD
CY2017	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	37203000	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	57272000	USD
CY2017Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	91954000	USD
CY2016Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	54751000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	109451000	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	57272000	USD
CY2017Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	91954000	USD
CY2019Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	99303000	USD
CY2018Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	47956000	USD
CY2017Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	82610000	USD
CY2017Q4	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	9344000	USD
CY2019Q4	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	10148000	USD
CY2018Q4	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	9316000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	109451000	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	57272000	USD
CY2017Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	91954000	USD
CY2019Q4	dei	Entity Number Of Employees EntityNumberOfEmployees	206	Employee
CY2019Q4	us-gaap	Number Of Real Estate Properties NumberOfRealEstateProperties	28	Property
CY2019Q4	aat	Real Estate Properties Held For Development RealEstatePropertiesHeldForDevelopment	3	Property
CY2019	us-gaap	Use Of Estimates UseOfEstimates	<div style="line-height:120%;padding-top:18px;text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;font-style:italic;font-weight:bold;">Use of Estimates</span></div><div style="line-height:120%;padding-top:12px;text-align:left;text-indent:32px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America, referred to as “GAAP,” requires management to make estimates and assumptions that in certain circumstances affect the reported amounts of assets and liabilities, disclosure of contingent assets and liabilities, and revenues and expenses. These estimates are prepared using management's best judgment, after considering past, current and expected events and economic conditions. Actual results could differ from these estimates. </span></div>
CY2019	us-gaap	Interest Costs Incurred InterestCostsIncurred	54636000	USD
CY2018	us-gaap	Interest Costs Incurred InterestCostsIncurred	53736000	USD
CY2017	us-gaap	Interest Costs Incurred InterestCostsIncurred	55418000	USD
CY2019	us-gaap	Interest Costs Capitalized Adjustment InterestCostsCapitalizedAdjustment	628000	USD
CY2018	us-gaap	Interest Costs Capitalized Adjustment InterestCostsCapitalizedAdjustment	1488000	USD
CY2017	us-gaap	Interest Costs Capitalized Adjustment InterestCostsCapitalizedAdjustment	1570000	USD
CY2019	us-gaap	Interest Expense InterestExpense	54008000	USD
CY2018	us-gaap	Interest Expense InterestExpense	52248000	USD
CY2017	us-gaap	Interest Expense InterestExpense	53848000	USD
CY2019	us-gaap	Interest Paid Net InterestPaidNet	51975000	USD
CY2018	us-gaap	Interest Paid Net InterestPaidNet	52632000	USD
CY2017	us-gaap	Interest Paid Net InterestPaidNet	47473000	USD
CY2019	us-gaap	Income Taxes Paid IncomeTaxesPaid	971000	USD
CY2018	us-gaap	Income Taxes Paid IncomeTaxesPaid	462000	USD
CY2017	us-gaap	Income Taxes Paid IncomeTaxesPaid	461000	USD
CY2019	aat	Increase Decrease Accrued Constructionin Progress IncreaseDecreaseAccruedConstructioninProgress	25413000	USD
CY2018	aat	Increase Decrease Accrued Constructionin Progress IncreaseDecreaseAccruedConstructioninProgress	14440000	USD
CY2017	aat	Increase Decrease Accrued Constructionin Progress IncreaseDecreaseAccruedConstructioninProgress	6863000	USD
CY2017	aat	Increase Decrease Accrued Leasing Commissions IncreaseDecreaseAccruedLeasingCommissions	1694000	USD
CY2019	aat	Increase Decrease Accrued Leasing Commissions IncreaseDecreaseAccruedLeasingCommissions	3345000	USD
CY2018	aat	Increase Decrease Accrued Leasing Commissions IncreaseDecreaseAccruedLeasingCommissions	5229000	USD
CY2019	aat	Reductionto Capitalfor Prepaid Offering Costs ReductiontoCapitalforPrepaidOfferingCosts	0	USD
CY2018	aat	Reductionto Capitalfor Prepaid Offering Costs ReductiontoCapitalforPrepaidOfferingCosts	241000	USD
CY2017	aat	Reductionto Capitalfor Prepaid Offering Costs ReductiontoCapitalforPrepaidOfferingCosts	0	USD
CY2019	aat	Real Estate Owned Transferto Real Estate Ownedfrom Ground Lease Obligations RealEstateOwnedTransfertoRealEstateOwnedfromGroundLeaseObligations	4518000	USD
CY2018	aat	Real Estate Owned Transferto Real Estate Ownedfrom Ground Lease Obligations RealEstateOwnedTransfertoRealEstateOwnedfromGroundLeaseObligations	0	USD
CY2017	aat	Real Estate Owned Transferto Real Estate Ownedfrom Ground Lease Obligations RealEstateOwnedTransfertoRealEstateOwnedfromGroundLeaseObligations	0	USD
CY2019Q4	us-gaap	Allowance For Doubtful Accounts Receivable AllowanceForDoubtfulAccountsReceivable	1200000	USD
CY2018Q4	us-gaap	Allowance For Doubtful Accounts Receivable AllowanceForDoubtfulAccountsReceivable	600000	USD
CY2019	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	1800000	USD
CY2018	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	800000	USD
CY2017	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	800000	USD
CY2019	us-gaap	Depreciation Depreciation	85300000	USD
CY2018	us-gaap	Depreciation Depreciation	99600000	USD
CY2017	us-gaap	Depreciation Depreciation	70200000	USD
CY2019	aat	Cash Equivalents Maturity Period CashEquivalentsMaturityPeriod	P3M
CY2019Q4	us-gaap	Cash Fdic Insured Amount CashFDICInsuredAmount	250000	USD
CY2019Q4	us-gaap	Cash Uninsured Amount CashUninsuredAmount	36200000	USD
CY2018Q4	us-gaap	Cash Uninsured Amount CashUninsuredAmount	42400000	USD
CY2019Q4	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	10100000	USD
CY2018Q4	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	9300000	USD
CY2017	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Plan Modification Incremental Compensation Cost ShareBasedCompensationArrangementByShareBasedPaymentAwardPlanModificationIncrementalCompensationCost	2200000	USD
CY2019	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Plan Modification Incremental Compensation Cost ShareBasedCompensationArrangementByShareBasedPaymentAwardPlanModificationIncrementalCompensationCost	0	USD
CY2019	us-gaap	Number Of Operating Segments NumberOfOperatingSegments	4	Segment
CY2019Q4	aat	Number Of Rooms In Mixed Use Segment All Suite Hotel NumberOfRoomsInMixedUseSegmentAllSuiteHotel	369	Room
CY2019	aat	Lease Practical Expedient Leaseand Nonlease Components LeasePracticalExpedientLeaseandNonleaseComponents	38400000	USD
CY2019Q1	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	7700000	USD
CY2019Q1	us-gaap	Deferred Rent Credit DeferredRentCredit	800000	USD
CY2019Q4	us-gaap	Operating Leases Future Minimum Payments Due OperatingLeasesFutureMinimumPaymentsDue	5600000	USD
CY2019	us-gaap	Acquired Finite Lived Intangible Assets Weighted Average Useful Life AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife	P8Y2M12D
CY2019	us-gaap	Revenues Revenues	366741000	USD
CY2018	us-gaap	Revenues Revenues	330867000	USD
CY2019	us-gaap	Operating Expenses OperatingExpenses	253056000	USD
CY2018	us-gaap	Operating Expenses OperatingExpenses	251332000	USD
CY2019	us-gaap	Operating Income Loss OperatingIncomeLoss	113685000	USD
CY2018	us-gaap	Operating Income Loss OperatingIncomeLoss	79535000	USD
CY2019	us-gaap	Profit Loss ProfitLoss	60188000	USD
CY2018	us-gaap	Profit Loss ProfitLoss	27202000	USD
CY2019Q4	us-gaap	Below Market Lease Gross BelowMarketLeaseGross	62126000	USD
CY2018Q4	us-gaap	Below Market Lease Gross BelowMarketLeaseGross	63172000	USD
CY2019Q4	us-gaap	Below Market Lease Accumulated Amortization BelowMarketLeaseAccumulatedAmortization	36674000	USD
CY2018Q4	us-gaap	Below Market Lease Accumulated Amortization BelowMarketLeaseAccumulatedAmortization	37220000	USD
CY2019Q4	us-gaap	Below Market Lease Net BelowMarketLeaseNet	25452000	USD
CY2018Q4	us-gaap	Below Market Lease Net BelowMarketLeaseNet	25952000	USD
CY2019	us-gaap	Amortization Of Above And Below Market Leases AmortizationOfAboveAndBelowMarketLeases	3800000	USD
CY2018	us-gaap	Amortization Of Above And Below Market Leases AmortizationOfAboveAndBelowMarketLeases	3600000	USD
CY2017	us-gaap	Amortization Of Above And Below Market Leases AmortizationOfAboveAndBelowMarketLeases	3300000	USD
CY2019	aat	Acquired Finite Lived Intangible Liabilities Below Market Leases Weighted Average Period Before Renewalor Extension AcquiredFiniteLivedIntangibleLiabilitiesBelowMarketLeasesWeightedAveragePeriodBeforeRenewalorExtension	P11Y
CY2019	aat	Finite Lived Intangible Liabilities Below Market Leases Renewal Options FiniteLivedIntangibleLiabilitiesBelowMarketLeasesRenewalOptions	12300000	USD
CY2019	aat	Finite Lived Intangible Liabilities Below Market Leases Weighted Average Period Before Next Renewalor Extension FiniteLivedIntangibleLiabilitiesBelowMarketLeasesWeightedAveragePeriodBeforeNextRenewalorExtension	P8Y10M24D
CY2019	us-gaap	Amortization Of Below Market Lease AmortizationOfBelowMarketLease	4131000	USD
CY2018	us-gaap	Amortization Of Below Market Lease AmortizationOfBelowMarketLease	4230000	USD
CY2017	us-gaap	Amortization Of Below Market Lease AmortizationOfBelowMarketLease	4239000	USD
CY2019	us-gaap	Amortization Of Leased Asset AmortizationOfLeasedAsset	976000	USD
CY2018	us-gaap	Amortization Of Leased Asset AmortizationOfLeasedAsset	-1480000	USD
CY2017	us-gaap	Amortization Of Leased Asset AmortizationOfLeasedAsset	5464000	USD
CY2019Q4	us-gaap	Below Market Lease Amortization Income Next Twelve Months BelowMarketLeaseAmortizationIncomeNextTwelveMonths	3382000	USD
CY2019Q4	us-gaap	Below Market Lease Amortization Income Year Two BelowMarketLeaseAmortizationIncomeYearTwo	3148000	USD
CY2019Q4	us-gaap	Below Market Lease Amortization Income Year Three BelowMarketLeaseAmortizationIncomeYearThree	2579000	USD
CY2019Q4	us-gaap	Below Market Lease Amortization Income Year Four BelowMarketLeaseAmortizationIncomeYearFour	2329000	USD
CY2019Q4	us-gaap	Below Market Lease Amortization Income Year Five BelowMarketLeaseAmortizationIncomeYearFive	2038000	USD
CY2019Q4	us-gaap	Below Market Lease Amortization Income After Year Five BelowMarketLeaseAmortizationIncomeAfterYearFive	11976000	USD
CY2019Q4	us-gaap	Below Market Lease Net BelowMarketLeaseNet	25452000	USD
CY2019Q4	us-gaap	Liabilities Fair Value Disclosure LiabilitiesFairValueDisclosure	1669000	USD
CY2018Q4	us-gaap	Liabilities Fair Value Disclosure LiabilitiesFairValueDisclosure	1424000	USD
CY2019Q4	us-gaap	Interest Rate Derivative Assets At Fair Value InterestRateDerivativeAssetsAtFairValue	434000	USD
CY2018Q4	us-gaap	Interest Rate Derivative Assets At Fair Value InterestRateDerivativeAssetsAtFairValue	6002000	USD
CY2019Q4	us-gaap	Interest Rate Derivative Liabilities At Fair Value InterestRateDerivativeLiabilitiesAtFairValue	1317000	USD
CY2018Q4	us-gaap	Interest Rate Derivative Liabilities At Fair Value InterestRateDerivativeLiabilitiesAtFairValue	801000	USD
CY2019Q4	us-gaap	Deferred Costs Leasing Net DeferredCostsLeasingNet	42539000	USD
CY2018Q4	us-gaap	Deferred Costs Leasing Net DeferredCostsLeasingNet	28796000	USD
CY2019Q4	us-gaap	Derivative Assets DerivativeAssets	434000	USD
CY2018Q4	us-gaap	Derivative Assets DerivativeAssets	6002000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Asset Off Market Lease Favorable Gross FiniteLivedIntangibleAssetOffMarketLeaseFavorableGross	183000	USD
CY2018Q4	us-gaap	Finite Lived Intangible Asset Off Market Lease Favorable Gross FiniteLivedIntangibleAssetOffMarketLeaseFavorableGross	518000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Asset Acquired In Place Leases FiniteLivedIntangibleAssetAcquiredInPlaceLeases	31224000	USD
CY2018Q4	us-gaap	Finite Lived Intangible Asset Acquired In Place Leases FiniteLivedIntangibleAssetAcquiredInPlaceLeases	6281000	USD
CY2019Q4	us-gaap	Incentive To Lessee IncentiveToLessee	2603000	USD
CY2018Q4	us-gaap	Incentive To Lessee IncentiveToLessee	747000	USD
CY2019Q4	us-gaap	Other Finite Lived Intangible Assets Gross OtherFiniteLivedIntangibleAssetsGross	2893000	USD
CY2018Q4	us-gaap	Other Finite Lived Intangible Assets Gross OtherFiniteLivedIntangibleAssetsGross	2994000	USD
CY2019Q4	us-gaap	Deferred Finance Costs Net DeferredFinanceCostsNet	1256000	USD
CY2018Q4	us-gaap	Deferred Finance Costs Net DeferredFinanceCostsNet	0	USD
CY2019Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	4863000	USD
CY2018Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	0	USD
CY2019Q4	us-gaap	Prepaid Expense And Other Assets PrepaidExpenseAndOtherAssets	93220000	USD
CY2018Q4	us-gaap	Prepaid Expense And Other Assets PrepaidExpenseAndOtherAssets	52021000	USD
CY2019Q4	us-gaap	Prepaid Expense Current And Noncurrent PrepaidExpenseCurrentAndNoncurrent	7225000	USD
CY2018Q4	us-gaap	Prepaid Expense Current And Noncurrent PrepaidExpenseCurrentAndNoncurrent	6683000	USD
CY2019Q4	us-gaap	Off Market Lease Unfavorable OffMarketLeaseUnfavorable	25452000	USD
CY2018Q4	us-gaap	Off Market Lease Unfavorable OffMarketLeaseUnfavorable	25952000	USD
CY2019Q4	us-gaap	Deferred Revenue DeferredRevenue	16969000	USD
CY2018Q4	us-gaap	Deferred Revenue DeferredRevenue	11634000	USD
CY2019Q4	us-gaap	Derivative Liabilities DerivativeLiabilities	1317000	USD
CY2018Q4	us-gaap	Derivative Liabilities DerivativeLiabilities	801000	USD
CY2019Q4	us-gaap	Deferred Rent Credit DeferredRentCredit	16903000	USD
CY2018Q4	us-gaap	Deferred Rent Credit DeferredRentCredit	7393000	USD
CY2019Q4	aat	Deferred Rent Expense And Lease Intangible DeferredRentExpenseAndLeaseIntangible	28000	USD
CY2018Q4	aat	Deferred Rent Expense And Lease Intangible DeferredRentExpenseAndLeaseIntangible	2210000	USD
CY2019Q4	us-gaap	Deferred Compensation Liability Current And Noncurrent DeferredCompensationLiabilityCurrentAndNoncurrent	1669000	USD
CY2018Q4	us-gaap	Deferred Compensation Liability Current And Noncurrent DeferredCompensationLiabilityCurrentAndNoncurrent	1424000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	332000	USD
CY2018Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	93000	USD
CY2019Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	5380000	USD
CY2018Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	0	USD
CY2019Q4	us-gaap	Other Liabilities OtherLiabilities	60000	USD
CY2018Q4	us-gaap	Other Liabilities OtherLiabilities	40000	USD
CY2019Q4	us-gaap	Deferred Credits And Other Liabilities DeferredCreditsAndOtherLiabilities	68110000	USD
CY2018Q4	us-gaap	Deferred Credits And Other Liabilities DeferredCreditsAndOtherLiabilities	49547000	USD
CY2019Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Next Twelve Months LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths	51003000	USD
CY2019Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Two LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo	250000000	USD
CY2019Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Three LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree	111000000	USD
CY2019Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Four LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour	150000000	USD
CY2019Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive	100000000	USD
CY2019Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal After Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive	700000000	USD
CY2019Q4	us-gaap	Long Term Debt LongTermDebt	1362003000	USD
CY2019	us-gaap	Line Of Credit Facility Interest Rate During Period LineOfCreditFacilityInterestRateDuringPeriod	0.0355
CY2019	us-gaap	Cash Flow Hedge Gain Loss To Be Reclassified Within Twelve Months CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths	1300000	USD
CY2019Q2	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	10925000	shares
CY2019Q2	us-gaap	Option Indexed To Issuers Equity Indexed Shares OptionIndexedToIssuersEquityIndexedShares	1425000	shares
CY2019Q2	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	472600000	USD
CY2019Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	10000000	shares
CY2019Q4	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	0.01
CY2019Q4	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	0	shares
CY2017Q1	aat	Dividends Quarterly Period DividendsQuarterlyPeriod	First Quarter 2017
CY2017Q1	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.26
CY2017Q1	aat	Dividends Date Paid DividendsDatePaid	2017-03-30
CY2017Q2	aat	Dividends Quarterly Period DividendsQuarterlyPeriod	Second Quarter 2017
CY2017Q2	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.26
CY2017Q2	aat	Dividends Date Paid DividendsDatePaid	2017-06-29
CY2017Q3	aat	Dividends Quarterly Period DividendsQuarterlyPeriod	Third Quarter 2017
CY2017Q3	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.26
CY2017Q3	aat	Dividends Date Paid DividendsDatePaid	2017-09-28
CY2017Q4	aat	Dividends Quarterly Period DividendsQuarterlyPeriod	Fourth Quarter 2017
CY2017Q4	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.27
CY2017Q4	aat	Dividends Date Paid DividendsDatePaid	2017-12-21
CY2018Q1	aat	Dividends Quarterly Period DividendsQuarterlyPeriod	First Quarter 2018
CY2018Q1	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.27
CY2018Q1	aat	Dividends Date Paid DividendsDatePaid	2018-03-19
CY2018Q2	aat	Dividends Quarterly Period DividendsQuarterlyPeriod	Second Quarter 2018
CY2018Q2	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.27
CY2018Q2	aat	Dividends Date Paid DividendsDatePaid	2018-06-28
CY2018Q3	aat	Dividends Quarterly Period DividendsQuarterlyPeriod	Third Quarter 2018
CY2018Q3	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.27
CY2018Q3	aat	Dividends Date Paid DividendsDatePaid	2018-09-27
CY2018Q4	aat	Dividends Quarterly Period DividendsQuarterlyPeriod	Fourth Quarter 2018
CY2018Q4	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.28
CY2018Q4	aat	Dividends Date Paid DividendsDatePaid	2018-12-27
CY2019Q1	aat	Dividends Quarterly Period DividendsQuarterlyPeriod	First Quarter 2019
CY2019Q1	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.28
CY2019Q1	aat	Dividends Date Paid DividendsDatePaid	2019-03-28
CY2019Q2	aat	Dividends Quarterly Period DividendsQuarterlyPeriod	Second Quarter 2019
CY2019Q2	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.28
CY2019Q2	aat	Dividends Date Paid DividendsDatePaid	2019-06-27
CY2019Q3	aat	Dividends Quarterly Period DividendsQuarterlyPeriod	Third Quarter 2019
CY2019Q3	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.28
CY2019Q3	aat	Dividends Date Paid DividendsDatePaid	2019-09-26
CY2019Q4	aat	Dividends Quarterly Period DividendsQuarterlyPeriod	Fourth Quarter 2019
CY2019Q4	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.30
CY2019Q4	aat	Dividends Date Paid DividendsDatePaid	2019-12-26
CY2019	aat	Ordinary Income Dividends Per Share OrdinaryIncomeDividendsPerShare	1.09
CY2019	aat	Ordinary Income Dividends Percentage OrdinaryIncomeDividendsPercentage	0.956
CY2018	aat	Ordinary Income Dividends Per Share OrdinaryIncomeDividendsPerShare	1.05
CY2018	aat	Ordinary Income Dividends Percentage OrdinaryIncomeDividendsPercentage	0.963
CY2017	aat	Ordinary Income Dividends Per Share OrdinaryIncomeDividendsPerShare	1.05
CY2017	aat	Ordinary Income Dividends Percentage OrdinaryIncomeDividendsPercentage	1.000
CY2019	aat	Capital Gain Dividends Per Share CapitalGainDividendsPerShare	0
CY2019	aat	Capital Gain Dividends Percentage CapitalGainDividendsPercentage	0
CY2018	aat	Capital Gain Dividends Per Share CapitalGainDividendsPerShare	0
CY2018	aat	Capital Gain Dividends Percentage CapitalGainDividendsPercentage	0
CY2017	aat	Capital Gain Dividends Per Share CapitalGainDividendsPerShare	0
CY2017	aat	Capital Gain Dividends Percentage CapitalGainDividendsPercentage	0
CY2019	aat	Return Of Capital Dividends Per Share ReturnOfCapitalDividendsPerShare	0.05
CY2019	aat	Return Of Capital Dividends Percentage ReturnOfCapitalDividendsPercentage	0.044
CY2018	aat	Return Of Capital Dividends Per Share ReturnOfCapitalDividendsPerShare	0.04
CY2018	aat	Return Of Capital Dividends Percentage ReturnOfCapitalDividendsPercentage	0.037
CY2017	aat	Return Of Capital Dividends Per Share ReturnOfCapitalDividendsPerShare	0
CY2017	aat	Return Of Capital Dividends Percentage ReturnOfCapitalDividendsPercentage	0
CY2019	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	1.14
CY2019	aat	Common Stock Dividend Rate Percentage CommonStockDividendRatePercentage	1.000
CY2018	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	1.09
CY2018	aat	Common Stock Dividend Rate Percentage CommonStockDividendRatePercentage	1.000
CY2017	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	1.05
CY2017	aat	Common Stock Dividend Rate Percentage CommonStockDividendRatePercentage	1.000
CY2019Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Authorized ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized	4054411	shares
CY2019Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Available For Grant ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant	2422181	shares
CY2019	us-gaap	Restricted Stock Expense RestrictedStockExpense	4500000	USD
CY2018	us-gaap	Restricted Stock Expense RestrictedStockExpense	3000000.0	USD
CY2017	us-gaap	Restricted Stock Expense RestrictedStockExpense	4700000	USD
CY2019Q4	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Share Based Awards Other Than Options EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions	7100000	USD
CY2017	aat	Weighted Average Unvested Participating Securities Outstanding WeightedAverageUnvestedParticipatingSecuritiesOutstanding	230602	shares
CY2019	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	60188000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	27202000	USD
CY2017	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	40132000	USD
CY2019	aat	Net Income Attributable To Restricted Share NetIncomeAttributableToRestrictedShare	381000	USD
CY2018	aat	Net Income Attributable To Restricted Share NetIncomeAttributableToRestrictedShare	311000	USD
CY2017	aat	Net Income Attributable To Restricted Share NetIncomeAttributableToRestrictedShare	241000	USD
CY2019	aat	Minority Interest In Continuing Operations Income Loss Operating Partnerships MinorityInterestInContinuingOperationsIncomeLossOperatingPartnerships	-14089000	USD
CY2018	aat	Minority Interest In Continuing Operations Income Loss Operating Partnerships MinorityInterestInContinuingOperationsIncomeLossOperatingPartnerships	-7205000	USD
CY2017	aat	Minority Interest In Continuing Operations Income Loss Operating Partnerships MinorityInterestInContinuingOperationsIncomeLossOperatingPartnerships	-10814000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	45718000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	19686000	USD
CY2017	us-gaap	Net Income Loss NetIncomeLoss	29077000	USD
CY2019	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	45718000	USD
CY2018	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	19686000	USD
CY2017	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	29077000	USD
CY2019	aat	Minority Interest In Continuing Operations Income Loss Operating Partnerships MinorityInterestInContinuingOperationsIncomeLossOperatingPartnerships	-14089000	USD
CY2018	aat	Minority Interest In Continuing Operations Income Loss Operating Partnerships MinorityInterestInContinuingOperationsIncomeLossOperatingPartnerships	-7205000	USD
CY2017	aat	Minority Interest In Continuing Operations Income Loss Operating Partnerships MinorityInterestInContinuingOperationsIncomeLossOperatingPartnerships	-10814000	USD
CY2019	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	59807000	USD
CY2018	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	26891000	USD
CY2017	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	39891000	USD
CY2019	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	54110949	shares
CY2018	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	46950812	shares
CY2017	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	46715520	shares
CY2019	aat	Incremental Common Shares Attributable To Conversion Of Operating Partnership Units IncrementalCommonSharesAttributableToConversionOfOperatingPartnershipUnits	16675183	shares
CY2018	aat	Incremental Common Shares Attributable To Conversion Of Operating Partnership Units IncrementalCommonSharesAttributableToConversionOfOperatingPartnershipUnits	17185747	shares
CY2017	aat	Incremental Common Shares Attributable To Conversion Of Operating Partnership Units IncrementalCommonSharesAttributableToConversionOfOperatingPartnershipUnits	17371730	shares
CY2019	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	70786132	shares
CY2018	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	64136559	shares
CY2017	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	64087250	shares
CY2019	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.84
CY2018	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.42
CY2017	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.62
CY2019	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.84
CY2018	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.42
CY2017	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.62
CY2019Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	300000	USD
CY2018Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	100000	USD
CY2019	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	48000	USD
CY2018	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	60000	USD
CY2017	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	0	USD
CY2019	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	625000	USD
CY2018	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	465000	USD
CY2017	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	422000	USD
CY2019	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	237000	USD
CY2018	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-6000	USD
CY2017	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	0	USD
CY2019	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-91000	USD
CY2018	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-192000	USD
CY2017	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-208000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	819000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	327000	USD
CY2017	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	214000	USD
CY2019	us-gaap	Loss On Contract Termination For Default LossOnContractTerminationForDefault	7600000	USD
CY2019Q4	aat	Transfer Taxes Liability TransferTaxesLiability	6600000	USD
CY2019	aat	Maximum Percentage Of Revenue Provided By Any Single Tenant MaximumPercentageOfRevenueProvidedByAnySingleTenant	0.100
CY2019	aat	Years Minimum Term Range Of Office And Retail Leases YearsMinimumTermRangeOfOfficeAndRetailLeases	P3Y
CY2019	aat	Years Maximum Term Range Of Office And Retail Leases YearsMaximumTermRangeOfOfficeAndRetailLeases	P10Y
CY2019	aat	Months Minimum Term Of Apartment Leases MonthsMinimumTermOfApartmentLeases	P7M
CY2019	aat	Months Maximum Term Length Of Apartment Leases MonthsMaximumTermLengthOfApartmentLeases	P15M
CY2019	aat	Operating Leases Rental Period Terms OperatingLeasesRentalPeriodTerms	P12M
CY2019	aat	Number Of States NumberOfStates	5	state
CY2019Q4	us-gaap	Lessor Operating Lease Payments To Be Received Remainder Of Fiscal Year LessorOperatingLeasePaymentsToBeReceivedRemainderOfFiscalYear	216969000	USD
CY2019Q4	us-gaap	Lessor Operating Lease Payments To Be Received Two Years LessorOperatingLeasePaymentsToBeReceivedTwoYears	212728000	USD
CY2019Q4	us-gaap	Lessor Operating Lease Payments To Be Received Three Years LessorOperatingLeasePaymentsToBeReceivedThreeYears	196345000	USD
CY2019Q4	us-gaap	Lessor Operating Lease Payments To Be Received Four Years LessorOperatingLeasePaymentsToBeReceivedFourYears	175686000	USD
CY2019Q4	us-gaap	Lessor Operating Lease Payments To Be Received Five Years LessorOperatingLeasePaymentsToBeReceivedFiveYears	146164000	USD
CY2019Q4	us-gaap	Lessor Operating Lease Payments To Be Received Thereafter LessorOperatingLeasePaymentsToBeReceivedThereafter	523183000	USD
CY2019Q4	us-gaap	Lessor Operating Lease Payments To Be Received LessorOperatingLeasePaymentsToBeReceived	1471075000	USD
CY2019	aat	Months Minimum Term Of Apartment Leases MonthsMinimumTermOfApartmentLeases	P7M
CY2019	aat	Months Maximum Term Length Of Apartment Leases MonthsMaximumTermLengthOfApartmentLeases	P15M
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Remainder Of Fiscal Year LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear	3422000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	2153000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	0	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	0	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Five LesseeOperatingLeaseLiabilityPaymentsDueYearFive	0	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due After Year Five LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive	0	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	5575000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	195000	USD
CY2019Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	5380000	USD
CY2017	us-gaap	Straight Line Rent StraightLineRent	-800000	USD
CY2019	us-gaap	Operating Lease Cost OperatingLeaseCost	3334000	USD
CY2019	us-gaap	Variable Lease Cost VariableLeaseCost	0	USD
CY2019	us-gaap	Sublease Income SubleaseIncome	3098000	USD
CY2019	us-gaap	Lease Cost LeaseCost	236000	USD
CY2019Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P1Y8M12D
CY2019Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.0413
CY2019	us-gaap	Operating Lease Payments OperatingLeasePayments	3347000	USD
CY2019	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	7661000	USD
CY2019	aat	Tenant Reimbursements Lease Revenue TenantReimbursementsLeaseRevenue	0	USD
CY2018	aat	Tenant Reimbursements Lease Revenue TenantReimbursementsLeaseRevenue	34584000	USD
CY2017	aat	Tenant Reimbursements Lease Revenue TenantReimbursementsLeaseRevenue	34267000	USD
CY2019	us-gaap	Percentage Rent PercentageRent	2476000	USD
CY2018	us-gaap	Percentage Rent PercentageRent	3149000	USD
CY2017	us-gaap	Percentage Rent PercentageRent	3214000	USD
CY2019	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	40297000	USD
CY2018	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	40049000	USD
CY2017	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	39545000	USD
CY2019	aat	Other Real Estate Rental Revenue OtherRealEstateRentalRevenue	2223000	USD
CY2018	aat	Other Real Estate Rental Revenue OtherRealEstateRentalRevenue	1611000	USD
CY2017	aat	Other Real Estate Rental Revenue OtherRealEstateRentalRevenue	1667000	USD
CY2019	us-gaap	Operating Leases Income Statement Lease Revenue OperatingLeasesIncomeStatementLeaseRevenue	343865000	USD
CY2018	us-gaap	Operating Leases Income Statement Lease Revenue OperatingLeasesIncomeStatementLeaseRevenue	309537000	USD
CY2017	us-gaap	Operating Leases Income Statement Lease Revenue OperatingLeasesIncomeStatementLeaseRevenue	298803000	USD
CY2019	us-gaap	Straight Line Rent StraightLineRent	3200000	USD
CY2018	us-gaap	Straight Line Rent StraightLineRent	-2400000	USD
CY2019	us-gaap	Amortization Of Above And Below Market Leases AmortizationOfAboveAndBelowMarketLeases	3800000	USD
CY2018	us-gaap	Amortization Of Above And Below Market Leases AmortizationOfAboveAndBelowMarketLeases	3600000	USD
CY2017	us-gaap	Amortization Of Above And Below Market Leases AmortizationOfAboveAndBelowMarketLeases	3300000	USD
CY2019	us-gaap	Operating Leases Rent Expense Net OperatingLeasesRentExpenseNet	38331000	USD
CY2018	us-gaap	Operating Leases Rent Expense Net OperatingLeasesRentExpenseNet	37322000	USD
CY2017	us-gaap	Operating Leases Rent Expense Net OperatingLeasesRentExpenseNet	34944000	USD
CY2019	us-gaap	Other Cost Of Operating Revenue OtherCostOfOperatingRevenue	24522000	USD
CY2018	us-gaap	Other Cost Of Operating Revenue OtherCostOfOperatingRevenue	24030000	USD
CY2017	us-gaap	Other Cost Of Operating Revenue OtherCostOfOperatingRevenue	24254000	USD
CY2019	us-gaap	Cost Of Property Repairs And Maintenance CostOfPropertyRepairsAndMaintenance	17035000	USD
CY2018	us-gaap	Cost Of Property Repairs And Maintenance CostOfPropertyRepairsAndMaintenance	13486000	USD
CY2017	us-gaap	Cost Of Property Repairs And Maintenance CostOfPropertyRepairsAndMaintenance	13136000	USD
CY2019	us-gaap	Marketing Expense MarketingExpense	2538000	USD
CY2018	us-gaap	Marketing Expense MarketingExpense	2108000	USD
CY2017	us-gaap	Marketing Expense MarketingExpense	2053000	USD
CY2019	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	3372000	USD
CY2018	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	3216000	USD
CY2017	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	3119000	USD
CY2019	us-gaap	Excise And Sales Taxes ExciseAndSalesTaxes	4160000	USD
CY2018	us-gaap	Excise And Sales Taxes ExciseAndSalesTaxes	4333000	USD
CY2017	us-gaap	Excise And Sales Taxes ExciseAndSalesTaxes	4454000	USD
CY2019	us-gaap	Management Fee Expense ManagementFeeExpense	2009000	USD
CY2018	us-gaap	Management Fee Expense ManagementFeeExpense	1987000	USD
CY2017	us-gaap	Management Fee Expense ManagementFeeExpense	2046000	USD
CY2019	us-gaap	Cost Of Other Property Operating Expense CostOfOtherPropertyOperatingExpense	91967000	USD
CY2018	us-gaap	Cost Of Other Property Operating Expense CostOfOtherPropertyOperatingExpense	86482000	USD
CY2017	us-gaap	Cost Of Other Property Operating Expense CostOfOtherPropertyOperatingExpense	84006000	USD
CY2019	us-gaap	Interest And Other Income InterestAndOtherIncome	696000	USD
CY2018	us-gaap	Interest And Other Income InterestAndOtherIncome	238000	USD
CY2017	us-gaap	Interest And Other Income InterestAndOtherIncome	548000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	819000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	327000	USD
CY2017	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	214000	USD
CY2019	us-gaap	Other Nonoperating Income OtherNonoperatingIncome	1000	USD
CY2018	us-gaap	Other Nonoperating Income OtherNonoperatingIncome	4000	USD
CY2017	us-gaap	Other Nonoperating Income OtherNonoperatingIncome	0	USD
CY2019	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-122000	USD
CY2018	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-85000	USD
CY2017	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	334000	USD
CY2019	aat	Percentage Of Investment In Related Party PercentageOfInvestmentInRelatedParty	0.477
CY2019	us-gaap	Number Of Operating Segments NumberOfOperatingSegments	4	Segment
CY2019Q4	aat	Number Of Rooms In Mixed Use Segment All Suite Hotel NumberOfRoomsInMixedUseSegmentAllSuiteHotel	369	Room
CY2019	us-gaap	Gross Profit GrossProfit	234761000	USD
CY2018	us-gaap	Gross Profit GrossProfit	209412000	USD
CY2017	us-gaap	Gross Profit GrossProfit	198306000	USD
CY2019	us-gaap	Gross Profit GrossProfit	234761000	USD
CY2018	us-gaap	Gross Profit GrossProfit	209412000	USD
CY2017	us-gaap	Gross Profit GrossProfit	198306000	USD
CY2019	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	24871000	USD
CY2018	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	22784000	USD
CY2017	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	21382000	USD
CY2019	us-gaap	Depreciation And Amortization DepreciationAndAmortization	96205000	USD
CY2018	us-gaap	Depreciation And Amortization DepreciationAndAmortization	107093000	USD
CY2017	us-gaap	Depreciation And Amortization DepreciationAndAmortization	83278000	USD
CY2019	us-gaap	Interest Expense InterestExpense	54008000	USD
CY2018	us-gaap	Interest Expense InterestExpense	52248000	USD
CY2017	us-gaap	Interest Expense InterestExpense	53848000	USD
CY2019	us-gaap	Gain Loss On Sale Of Properties GainLossOnSaleOfProperties	633000	USD
CY2018	us-gaap	Gain Loss On Sale Of Properties GainLossOnSaleOfProperties	0	USD
CY2017	us-gaap	Gain Loss On Sale Of Properties GainLossOnSaleOfProperties	0	USD
CY2019	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-122000	USD
CY2018	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-85000	USD
CY2017	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	334000	USD
CY2019	us-gaap	Profit Loss ProfitLoss	60188000	USD
CY2018	us-gaap	Profit Loss ProfitLoss	27202000	USD
CY2017	us-gaap	Profit Loss ProfitLoss	40132000	USD
CY2019	aat	Net Income Attributable To Restricted Share NetIncomeAttributableToRestrictedShare	381000	USD
CY2018	aat	Net Income Attributable To Restricted Share NetIncomeAttributableToRestrictedShare	311000	USD
CY2017	aat	Net Income Attributable To Restricted Share NetIncomeAttributableToRestrictedShare	241000	USD
CY2019	us-gaap	Noncontrolling Interest In Net Income Loss Operating Partnerships Redeemable NoncontrollingInterestInNetIncomeLossOperatingPartnershipsRedeemable	14089000	USD
CY2018	us-gaap	Noncontrolling Interest In Net Income Loss Operating Partnerships Redeemable NoncontrollingInterestInNetIncomeLossOperatingPartnershipsRedeemable	7205000	USD
CY2017	us-gaap	Noncontrolling Interest In Net Income Loss Operating Partnerships Redeemable NoncontrollingInterestInNetIncomeLossOperatingPartnershipsRedeemable	10814000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	45718000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	19686000	USD
CY2017	us-gaap	Net Income Loss NetIncomeLoss	29077000	USD
CY2019Q4	us-gaap	Real Estate Investment Property Net RealEstateInvestmentPropertyNet	2523475000	USD
CY2018Q4	us-gaap	Real Estate Investment Property Net RealEstateInvestmentPropertyNet	2039853000	USD
CY2019Q4	us-gaap	Notes Payable NotesPayable	162003000	USD
CY2018Q4	us-gaap	Notes Payable NotesPayable	182765000	USD
CY2019	aat	Capital Expendituresand Leasing Commissions CapitalExpendituresandLeasingCommissions	99594000	USD
CY2018	aat	Capital Expendituresand Leasing Commissions CapitalExpendituresandLeasingCommissions	64347000	USD
CY2019Q4	us-gaap	Revenues Revenues	98947000	USD
CY2019Q3	us-gaap	Revenues Revenues	98362000	USD
CY2019Q2	us-gaap	Revenues Revenues	84113000	USD
CY2019Q1	us-gaap	Revenues Revenues	85319000	USD
CY2019Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	29993000	USD
CY2019Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	30384000	USD
CY2019Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	24487000	USD
CY2019Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	28821000	USD
CY2019Q4	us-gaap	Profit Loss ProfitLoss	16485000	USD
CY2019Q3	us-gaap	Profit Loss ProfitLoss	16519000	USD
CY2019Q2	us-gaap	Profit Loss ProfitLoss	11941000	USD
CY2019Q1	us-gaap	Profit Loss ProfitLoss	15243000	USD
CY2019Q4	aat	Net Income Attributable To Restricted Share NetIncomeAttributableToRestrictedShare	104000	USD
CY2019Q3	aat	Net Income Attributable To Restricted Share NetIncomeAttributableToRestrictedShare	92000	USD
CY2019Q2	aat	Net Income Attributable To Restricted Share NetIncomeAttributableToRestrictedShare	92000	USD
CY2019Q1	aat	Net Income Attributable To Restricted Share NetIncomeAttributableToRestrictedShare	93000	USD
CY2019Q4	us-gaap	Noncontrolling Interest In Net Income Loss Operating Partnerships Redeemable NoncontrollingInterestInNetIncomeLossOperatingPartnershipsRedeemable	3536000	USD
CY2019Q3	us-gaap	Noncontrolling Interest In Net Income Loss Operating Partnerships Redeemable NoncontrollingInterestInNetIncomeLossOperatingPartnershipsRedeemable	3565000	USD
CY2019Q2	us-gaap	Noncontrolling Interest In Net Income Loss Operating Partnerships Redeemable NoncontrollingInterestInNetIncomeLossOperatingPartnershipsRedeemable	2933000	USD
CY2019Q1	us-gaap	Noncontrolling Interest In Net Income Loss Operating Partnerships Redeemable NoncontrollingInterestInNetIncomeLossOperatingPartnershipsRedeemable	4055000	USD
CY2019Q4	us-gaap	Net Income Loss NetIncomeLoss	12845000	USD
CY2019Q3	us-gaap	Net Income Loss NetIncomeLoss	12862000	USD
CY2019Q2	us-gaap	Net Income Loss NetIncomeLoss	8916000	USD
CY2019Q1	us-gaap	Net Income Loss NetIncomeLoss	11095000	USD
CY2019Q4	us-gaap	Earnings Per Share Basic And Diluted EarningsPerShareBasicAndDiluted	0.22
CY2019Q3	us-gaap	Earnings Per Share Basic And Diluted EarningsPerShareBasicAndDiluted	0.22
CY2019Q2	us-gaap	Earnings Per Share Basic And Diluted EarningsPerShareBasicAndDiluted	0.18
CY2019Q1	us-gaap	Earnings Per Share Basic And Diluted EarningsPerShareBasicAndDiluted	0.24
CY2018Q4	us-gaap	Revenues Revenues	82605000	USD
CY2018Q3	us-gaap	Revenues Revenues	82507000	USD
CY2018Q2	us-gaap	Revenues Revenues	85023000	USD
CY2018Q1	us-gaap	Revenues Revenues	80732000	USD
CY2018Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	22091000	USD
CY2018Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	27275000	USD
CY2018Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	17249000	USD
CY2018Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	12920000	USD
CY2018Q4	us-gaap	Profit Loss ProfitLoss	9209000	USD
CY2018Q3	us-gaap	Profit Loss ProfitLoss	14271000	USD
CY2018Q2	us-gaap	Profit Loss ProfitLoss	4413000	USD
CY2018Q1	us-gaap	Profit Loss ProfitLoss	-691000	USD
CY2018Q4	aat	Net Income Attributable To Restricted Share NetIncomeAttributableToRestrictedShare	96000	USD
CY2018Q3	aat	Net Income Attributable To Restricted Share NetIncomeAttributableToRestrictedShare	71000	USD
CY2018Q2	aat	Net Income Attributable To Restricted Share NetIncomeAttributableToRestrictedShare	216000	USD
CY2018Q1	aat	Net Income Attributable To Restricted Share NetIncomeAttributableToRestrictedShare	-72000	USD
CY2018Q4	us-gaap	Noncontrolling Interest In Net Income Loss Operating Partnerships Redeemable NoncontrollingInterestInNetIncomeLossOperatingPartnershipsRedeemable	2440000	USD
CY2018Q3	us-gaap	Noncontrolling Interest In Net Income Loss Operating Partnerships Redeemable NoncontrollingInterestInNetIncomeLossOperatingPartnershipsRedeemable	3806000	USD
CY2018Q2	us-gaap	Noncontrolling Interest In Net Income Loss Operating Partnerships Redeemable NoncontrollingInterestInNetIncomeLossOperatingPartnershipsRedeemable	1125000	USD
CY2018Q1	us-gaap	Noncontrolling Interest In Net Income Loss Operating Partnerships Redeemable NoncontrollingInterestInNetIncomeLossOperatingPartnershipsRedeemable	-166000	USD
CY2018Q4	us-gaap	Net Income Loss NetIncomeLoss	6673000	USD
CY2018Q3	us-gaap	Net Income Loss NetIncomeLoss	10394000	USD
CY2018Q2	us-gaap	Net Income Loss NetIncomeLoss	3072000	USD
CY2018Q1	us-gaap	Net Income Loss NetIncomeLoss	-453000	USD
CY2018Q4	us-gaap	Earnings Per Share Basic And Diluted EarningsPerShareBasicAndDiluted	0.14
CY2018Q3	us-gaap	Earnings Per Share Basic And Diluted EarningsPerShareBasicAndDiluted	0.22
CY2018Q2	us-gaap	Earnings Per Share Basic And Diluted EarningsPerShareBasicAndDiluted	0.07
CY2018Q1	us-gaap	Earnings Per Share Basic And Diluted EarningsPerShareBasicAndDiluted	-0.01
CY2019Q4	srt	Real Estate And Accumulated Depreciation Amount Of Encumbrances RealEstateAndAccumulatedDepreciationAmountOfEncumbrances	162003000	USD
CY2019Q4	us-gaap	Real Estate And Accumulated Depreciation Initial Cost Of Land RealEstateAndAccumulatedDepreciationInitialCostOfLand	593583000	USD
CY2019Q4	us-gaap	Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements	1784945000	USD
CY2019Q4	us-gaap	Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Carrying Costs RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts	810169000	USD
CY2019Q4	us-gaap	Real Estate And Accumulated Depreciation Carrying Amount Of Land RealEstateAndAccumulatedDepreciationCarryingAmountOfLand	628556000	USD
CY2019Q4	us-gaap	Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements	2560141000	USD
CY2019Q4	us-gaap	Real Estate Accumulated Depreciation RealEstateAccumulatedDepreciation	665222000	USD
CY2019Q4	srt	Real Estate Federal Income Tax Basis RealEstateFederalIncomeTaxBasis	2400000000	USD
CY2018Q4	us-gaap	Real Estate Gross At Carrying Value RealEstateGrossAtCarryingValue	2630191000	USD
CY2017Q4	us-gaap	Real Estate Gross At Carrying Value RealEstateGrossAtCarryingValue	2614138000	USD
CY2016Q4	us-gaap	Real Estate Gross At Carrying Value RealEstateGrossAtCarryingValue	2301006000	USD
CY2019	us-gaap	Real Estate Other Acquisitions RealEstateOtherAcquisitions	476421000	USD
CY2018	us-gaap	Real Estate Other Acquisitions RealEstateOtherAcquisitions	0	USD
CY2017	us-gaap	Real Estate Other Acquisitions RealEstateOtherAcquisitions	270602000	USD
CY2019	us-gaap	Real Estate Improvements RealEstateImprovements	101285000	USD
CY2018	us-gaap	Real Estate Improvements RealEstateImprovements	62790000	USD
CY2017	us-gaap	Real Estate Improvements RealEstateImprovements	44755000	USD
CY2019	us-gaap	Real Estate Cost Of Real Estate Sold RealEstateCostOfRealEstateSold	8845000	USD
CY2018	us-gaap	Real Estate Cost Of Real Estate Sold RealEstateCostOfRealEstateSold	0	USD
CY2017	us-gaap	Real Estate Cost Of Real Estate Sold RealEstateCostOfRealEstateSold	0	USD
CY2019	us-gaap	Real Estate Other Deductions RealEstateOtherDeductions	10355000	USD
CY2018	us-gaap	Real Estate Other Deductions RealEstateOtherDeductions	46737000	USD
CY2017	us-gaap	Real Estate Other Deductions RealEstateOtherDeductions	2225000	USD
CY2019Q4	us-gaap	Real Estate Gross At Carrying Value RealEstateGrossAtCarryingValue	3188697000	USD
CY2018Q4	us-gaap	Real Estate Gross At Carrying Value RealEstateGrossAtCarryingValue	2630191000	USD
CY2017Q4	us-gaap	Real Estate Gross At Carrying Value RealEstateGrossAtCarryingValue	2614138000	USD
CY2018Q4	us-gaap	Real Estate Accumulated Depreciation RealEstateAccumulatedDepreciation	590338000	USD
CY2017Q4	us-gaap	Real Estate Accumulated Depreciation RealEstateAccumulatedDepreciation	537431000	USD
CY2016Q4	us-gaap	Real Estate Accumulated Depreciation RealEstateAccumulatedDepreciation	469460000	USD
CY2019	us-gaap	Sec Schedule Iii Real Estate Accumulated Depreciation Depreciation Expense SECScheduleIIIRealEstateAccumulatedDepreciationDepreciationExpense	85428000	USD
CY2018	us-gaap	Sec Schedule Iii Real Estate Accumulated Depreciation Depreciation Expense SECScheduleIIIRealEstateAccumulatedDepreciationDepreciationExpense	99644000	USD
CY2017	us-gaap	Sec Schedule Iii Real Estate Accumulated Depreciation Depreciation Expense SECScheduleIIIRealEstateAccumulatedDepreciationDepreciationExpense	70196000	USD
CY2019	us-gaap	Real Estate Accumulated Depreciation Real Estate Sold RealEstateAccumulatedDepreciationRealEstateSold	189000	USD
CY2018	us-gaap	Real Estate Accumulated Depreciation Real Estate Sold RealEstateAccumulatedDepreciationRealEstateSold	0	USD
CY2017	us-gaap	Real Estate Accumulated Depreciation Real Estate Sold RealEstateAccumulatedDepreciationRealEstateSold	0	USD
CY2019	us-gaap	Real Estate Accumulated Depreciation Other Deductions RealEstateAccumulatedDepreciationOtherDeductions	10355000	USD
CY2018	us-gaap	Real Estate Accumulated Depreciation Other Deductions RealEstateAccumulatedDepreciationOtherDeductions	46737000	USD
CY2017	us-gaap	Real Estate Accumulated Depreciation Other Deductions RealEstateAccumulatedDepreciationOtherDeductions	2225000	USD
CY2019Q4	us-gaap	Real Estate Accumulated Depreciation RealEstateAccumulatedDepreciation	665222000	USD
CY2018Q4	us-gaap	Real Estate Accumulated Depreciation RealEstateAccumulatedDepreciation	590338000	USD
CY2017Q4	us-gaap	Real Estate Accumulated Depreciation RealEstateAccumulatedDepreciation	537431000	USD

Files In Submission

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$AAT
American Assets Trust, Inc. Stock $aat

2018 Q4 Form 10-K Financial Statement

#000150021720000010 Filed on February 14, 2020

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

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$AAT American Assets Trust, Inc. Stock $aat

2018 Q4 Form 10-K Financial Statement

#000150021720000010 Filed on February 14, 2020

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$AAT
American Assets Trust, Inc. Stock $aat