$AVB
AVALONBAY COMMUNITIES INC Stock $avb

$avb Overview Financials Valuation SEC Filings Company Website

2016 Q4 Form 10-K Financial Statement

#000091591218000004 Filed on February 23, 2018

Income Statement

Concept	2016 Q4	2016 Q3	2016 Q2
Revenue	$518.2M	$516.2M	$502.3M
YoY Change	7.78%	8.59%	9.8%
Cost Of Revenue	$169.4M	$177.1M	$170.0M
YoY Change	7.08%	6.62%	7.59%
Gross Profit	$348.8M	$339.1M	$332.3M
YoY Change	8.12%	9.63%	10.95%
Gross Profit Margin	67.3%	65.69%	66.15%
Selling, General & Admin	$10.40M	$11.90M	$12.00M
YoY Change	6.12%	13.33%	16.5%
% of Gross Profit	2.98%	3.51%	3.61%
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$140.0M	$131.7M	$132.5M
YoY Change	14.57%	9.61%	11.67%
% of Gross Profit	40.14%	38.85%	39.86%
Operating Expenses	$150.6M	$372.5M	$363.2M
YoY Change	14.0%	14.6%	18.19%
Operating Profit	$198.2M	$345.2M	$339.6M
YoY Change	4.04%	9.69%	9.21%
Interest Expense	-$39.40M	$47.87M	$46.58M
YoY Change	-4.14%	10.73%	4.47%
% of Operating Profit	-19.88%	13.87%	13.72%
Other Income/Expense, Net
YoY Change
Pretax Income	$242.4M	$356.4M	$197.4M
YoY Change	54.2%	72.89%	13.72%
Income Tax	$200.0K	$22.00K	$36.00K
% Of Pretax Income	0.08%	0.01%	0.02%
Net Earnings	$242.2M	$356.3M	$197.3M
YoY Change	55.89%	72.91%	14.55%
Net Earnings / Revenue	46.73%	69.03%	39.28%
Basic Earnings Per Share	$1.76	$2.60	$1.44
Diluted Earnings Per Share	$1.76	$2.59	$1.44
COMMON SHARES
Basic Shares Outstanding	137.3M shares	137.0M shares	136.9M shares
Diluted Shares Outstanding		137.5M shares	137.4M shares

Balance Sheet

Concept	2016 Q4	2016 Q3	2016 Q2
SHORT-TERM ASSETS
Cash & Short-Term Investments	$215.0M	$66.00M	$182.0M
YoY Change	-46.38%	-79.31%	180.0%
Cash & Equivalents	$215.0M	$65.90M	$182.3M
Short-Term Investments
Other Short-Term Assets	$257.0M	$229.0M	$209.0M
YoY Change	29.15%	13.93%	0.97%
Inventory
Prepaid Expenses
Receivables
Other Receivables
Total Short-Term Assets	$472.0M	$295.0M	$391.0M
YoY Change	-21.33%	-43.27%	43.75%
LONG-TERM ASSETS
Property, Plant & Equipment	$17.03B	$16.87B	$16.50B
YoY Change	6.84%	6.84%	5.89%
Goodwill
YoY Change
Intangibles
YoY Change
Long-Term Investments	$175.0M	$177.0M	$326.0M
YoY Change	-19.35%	-34.2%	23.02%
Other Assets	$155.0M	$212.0M	$146.0M
YoY Change	9.15%	23.26%	-15.12%
Total Long-Term Assets	$17.40B	$17.29B	$17.00B
YoY Change	6.51%	6.34%	5.95%
TOTAL ASSETS
Total Short-Term Assets	$472.0M	$295.0M	$391.0M
Total Long-Term Assets	$17.40B	$17.29B	$17.00B
Total Assets	$17.87B	$17.59B	$17.40B
YoY Change	5.53%	4.81%	6.58%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$101.0M	$100.0M	$101.0M
YoY Change	2.02%	-2.91%	-7.34%
Accrued Expenses	$313.0M	$379.0M	$349.0M
YoY Change	4.33%	23.45%	23.32%
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	$656.0M	$722.0M	$693.0M
YoY Change	5.3%	13.7%	13.24%
LONG-TERM LIABILITIES
Long-Term Debt	$7.031B	$6.816B	$6.834B
YoY Change	8.89%	8.07%	5.35%
Other Long-Term Liabilities	$1.000M	$4.000M	$2.000M
YoY Change	0.0%		100.0%
Total Long-Term Liabilities	$7.032B	$6.820B	$6.836B
YoY Change	8.89%	8.13%	5.36%
TOTAL LIABILITIES
Total Short-Term Liabilities	$656.0M	$722.0M	$693.0M
Total Long-Term Liabilities	$7.032B	$6.820B	$6.836B
Total Liabilities	$7.688B	$7.542B	$7.529B
YoY Change	8.58%	8.64%	6.05%
SHAREHOLDERS EQUITY
Retained Earnings	$94.90M	$36.04M	-$134.8M
YoY Change	-147.93%	-119.75%	-38.0%
Common Stock	$1.373M	$1.373M	$1.373M
YoY Change	0.22%	0.29%	3.31%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$10.17B	$10.04B	$9.857B
YoY Change
Total Liabilities & Shareholders Equity	$17.87B	$17.59B	$17.40B
YoY Change	5.53%	4.81%	6.58%

Cashflow Statement

Concept	2016 Q4	2016 Q3	2016 Q2
OPERATING ACTIVITIES
Net Income	$242.2M	$356.3M	$197.3M
YoY Change	55.89%	72.91%	14.55%
Depreciation, Depletion And Amortization	$140.0M	$131.7M	$132.5M
YoY Change	14.57%	9.61%	11.67%
Cash From Operating Activities	$282.8M	$307.5M	$275.4M
YoY Change	7.73%	1.69%	7.79%
INVESTING ACTIVITIES
Capital Expenditures	$37.90M	-$525.9M	-$334.4M
YoY Change	-112.07%	33.61%	1.27%
Acquisitions
YoY Change
Other Investing Activities	-$208.7M	$371.8M	$6.600M
YoY Change	-306.43%	266.67%	-91.55%
Cash From Investing Activities	-$170.8M	-$154.1M	-$327.8M
YoY Change	-19.81%	-47.26%	30.03%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	37.10M	-269.8M	137.1M
YoY Change	14.15%	-210.94%	-202.01%
NET CHANGE
Cash From Operating Activities	282.8M	307.5M	275.4M
Cash From Investing Activities	-170.8M	-154.1M	-327.8M
Cash From Financing Activities	37.10M	-269.8M	137.1M
Net Change In Cash	149.1M	-116.4M	84.70M
YoY Change	81.83%	-145.94%	-164.66%
FREE CASH FLOW
Cash From Operating Activities	$282.8M	$307.5M	$275.4M
Capital Expenditures	$37.90M	-$525.9M	-$334.4M
Free Cash Flow	$244.9M	$833.4M	$609.8M
YoY Change	-57.53%	19.74%	4.11%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2015	avb	Business Combination Acquisition Related Costs Abandoned Pursuit Costs BusinessCombinationAcquisitionRelatedCostsAbandonedPursuitCosts	3016000	USD
CY2017Q4	avb	Additional Numberof Communities Expected To Be Developed AdditionalNumberofCommunitiesExpectedToBeDeveloped	29	community
CY2017	avb	Anniversary Of Completion Of Development Or Redevelopment AnniversaryOfCompletionOfDevelopmentOrRedevelopment	P1Y
CY2017	avb	Attainment Percentage Of Physical Occupancy AttainmentPercentageOfPhysicalOccupancy	0.95
CY2016	avb	Business Combination Acquisition Related Costs Abandoned Pursuit Costs BusinessCombinationAcquisitionRelatedCostsAbandonedPursuitCosts	4183000	USD
CY2017	avb	Business Combination Acquisition Related Costs Abandoned Pursuit Costs BusinessCombinationAcquisitionRelatedCostsAbandonedPursuitCosts	2370000	USD
CY2015	avb	Capital Gain Tax Rate CapitalGainTaxRate	0.2
CY2016	avb	Capital Gain Tax Rate CapitalGainTaxRate	0.2
CY2017	avb	Capital Gain Tax Rate CapitalGainTaxRate	0.2
CY2015	avb	Casualty Gainand Impairment Loss Net Operating Activities CasualtyGainandImpairmentLossNetOperatingActivities	-17303000	USD
CY2016	avb	Casualty Gainand Impairment Loss Net Operating Activities CasualtyGainandImpairmentLossNetOperatingActivities	-3935000	USD
CY2017	avb	Casualty Gainand Impairment Loss Net Operating Activities CasualtyGainandImpairmentLossNetOperatingActivities	8568000	USD
CY2015	avb	Common Stock Dividends Long Term Capital Gain Percentage CommonStockDividendsLongTermCapitalGainPercentage	0.12
CY2016	avb	Common Stock Dividends Long Term Capital Gain Percentage CommonStockDividendsLongTermCapitalGainPercentage	0.26
CY2017	avb	Common Stock Dividends Long Term Capital Gain Percentage CommonStockDividendsLongTermCapitalGainPercentage	0.18
CY2015	avb	Common Stock Dividends Ordinary Taxable Distribution Percentage CommonStockDividendsOrdinaryTaxableDistributionPercentage	0.83
CY2016	avb	Common Stock Dividends Ordinary Taxable Distribution Percentage CommonStockDividendsOrdinaryTaxableDistributionPercentage	0.68
CY2017	avb	Common Stock Dividends Ordinary Taxable Distribution Percentage CommonStockDividendsOrdinaryTaxableDistributionPercentage	0.75
CY2015	avb	Common Stock Dividends Unrecaptured Section1250 Gain Percentage CommonStockDividendsUnrecapturedSection1250GainPercentage	0.05
CY2016	avb	Common Stock Dividends Unrecaptured Section1250 Gain Percentage CommonStockDividendsUnrecapturedSection1250GainPercentage	0.06
CY2017	avb	Common Stock Dividends Unrecaptured Section1250 Gain Percentage CommonStockDividendsUnrecapturedSection1250GainPercentage	0.07
CY2017Q2	avb	Derivative Notional Amounts Settled During Period DerivativeNotionalAmountsSettledDuringPeriod	185100000	USD
CY2017Q2	avb	Derivative Notional Amounts Settled During Period DerivativeNotionalAmountsSettledDuringPeriod	214900000	USD
CY2017Q2	avb	Derivative Notional Amounts Settled During Period DerivativeNotionalAmountsSettledDuringPeriod	400000000	USD
CY2017	avb	Derivative Notional Amounts Settled During Period DerivativeNotionalAmountsSettledDuringPeriod	800000000	USD
CY2015	avb	Disposal Group Not Discontinued Operation Net Operating Income From Assets Heldfor Sale Not Classifiedas Discontinued Operations DisposalGroupNotDiscontinuedOperationNetOperatingIncomeFromAssetsHeldforSaleNotClassifiedasDiscontinuedOperations	59383000	USD
CY2016	avb	Disposal Group Not Discontinued Operation Net Operating Income From Assets Heldfor Sale Not Classifiedas Discontinued Operations DisposalGroupNotDiscontinuedOperationNetOperatingIncomeFromAssetsHeldforSaleNotClassifiedasDiscontinuedOperations	44263000	USD
CY2017	avb	Disposal Group Not Discontinued Operation Net Operating Income From Assets Heldfor Sale Not Classifiedas Discontinued Operations DisposalGroupNotDiscontinuedOperationNetOperatingIncomeFromAssetsHeldforSaleNotClassifiedasDiscontinuedOperations	14573000	USD
CY2016Q4	avb	Equity Method Investment Summarized Financial Information Assets Other Assets EquityMethodInvestmentSummarizedFinancialInformationAssetsOtherAssets	49519000	USD
CY2017Q4	avb	Equity Method Investment Summarized Financial Information Assets Other Assets EquityMethodInvestmentSummarizedFinancialInformationAssetsOtherAssets	39976000	USD
CY2015	avb	Equity Method Investment Summarized Financial Information Depreciation And Amortization EquityMethodInvestmentSummarizedFinancialInformationDepreciationAndAmortization	45324000	USD
CY2016	avb	Equity Method Investment Summarized Financial Information Depreciation And Amortization EquityMethodInvestmentSummarizedFinancialInformationDepreciationAndAmortization	34471000	USD
CY2017	avb	Equity Method Investment Summarized Financial Information Depreciation And Amortization EquityMethodInvestmentSummarizedFinancialInformationDepreciationAndAmortization	25914000	USD
CY2015	avb	Equity Method Investment Summarized Financial Information Interest Expense EquityMethodInvestmentSummarizedFinancialInformationInterestExpense	45517000	USD
CY2016	avb	Equity Method Investment Summarized Financial Information Interest Expense EquityMethodInvestmentSummarizedFinancialInformationInterestExpense	45886000	USD
CY2017	avb	Equity Method Investment Summarized Financial Information Interest Expense EquityMethodInvestmentSummarizedFinancialInformationInterestExpense	27104000	USD
CY2016Q4	avb	Equity Method Investment Summarized Financial Information Liabilities Other Liabilities EquityMethodInvestmentSummarizedFinancialInformationLiabilitiesOtherLiabilities	16537000	USD
CY2017Q4	avb	Equity Method Investment Summarized Financial Information Liabilities Other Liabilities EquityMethodInvestmentSummarizedFinancialInformationLiabilitiesOtherLiabilities	10540000	USD
CY2016Q4	avb	Equity Method Investment Summarized Financial Information Mortgage Notes Payable And Credit Facility EquityMethodInvestmentSummarizedFinancialInformationMortgageNotesPayableAndCreditFacility	689573000	USD
CY2017Q4	avb	Equity Method Investment Summarized Financial Information Mortgage Notes Payable And Credit Facility EquityMethodInvestmentSummarizedFinancialInformationMortgageNotesPayableAndCreditFacility	523815000	USD
CY2015	avb	Equity Method Investment Summarized Financial Information Operating And Other Expenses EquityMethodInvestmentSummarizedFinancialInformationOperatingAndOtherExpenses	67962000	USD
CY2016	avb	Equity Method Investment Summarized Financial Information Operating And Other Expenses EquityMethodInvestmentSummarizedFinancialInformationOperatingAndOtherExpenses	50945000	USD
CY2017	avb	Equity Method Investment Summarized Financial Information Operating And Other Expenses EquityMethodInvestmentSummarizedFinancialInformationOperatingAndOtherExpenses	38566000	USD
CY2016Q4	avb	Equity Method Investment Summarized Financial Information Real Estate Net EquityMethodInvestmentSummarizedFinancialInformationRealEstateNet	954493000	USD
CY2017Q4	avb	Equity Method Investment Summarized Financial Information Real Estate Net EquityMethodInvestmentSummarizedFinancialInformationRealEstateNet	695077000	USD
CY2017Q4	avb	Estimated Number Of Apartment Homes In Communities Expected To Be Developed EstimatedNumberOfApartmentHomesInCommunitiesExpectedToBeDeveloped	9496	home
CY2015Q4	avb	Excise Tax Refund ExciseTaxRefund	0	USD
CY2016Q4	avb	Excise Tax Refund ExciseTaxRefund	0	USD
CY2017Q4	avb	Excise Tax Refund ExciseTaxRefund	0	USD
CY2017Q4	avb	Expected Aggregate Number Of Apartment Homes To Be Constructed ExpectedAggregateNumberOfApartmentHomesToBeConstructed	6544	home
CY2015	avb	Gainonsaleofrealestateassetsincontinuingoperations Gainonsaleofrealestateassetsincontinuingoperations	115625000	USD
CY2016	avb	Gainonsaleofrealestateassetsincontinuingoperations Gainonsaleofrealestateassetsincontinuingoperations	374623000	USD
CY2017	avb	Gainonsaleofrealestateassetsincontinuingoperations Gainonsaleofrealestateassetsincontinuingoperations	252599000	USD
CY2015	avb	Indirect Operating Expenses Net Of Corporate Income IndirectOperatingExpensesNetOfCorporateIncome	56973000	USD
CY2016	avb	Indirect Operating Expenses Net Of Corporate Income IndirectOperatingExpensesNetOfCorporateIncome	61403000	USD
CY2017	avb	Indirect Operating Expenses Net Of Corporate Income IndirectOperatingExpensesNetOfCorporateIncome	65398000	USD
CY2017	avb	Minimum Percentage Of Distribution Of Adjusted Taxable Income For Deducting Dividends From Federally Taxable Income MinimumPercentageOfDistributionOfAdjustedTaxableIncomeForDeductingDividendsFromFederallyTaxableIncome	0.9
CY2017	avb	Minimum Percentage Of Distribution Of Reit Taxable Income For Federal Income Tax Exemption MinimumPercentageOfDistributionOfREITTaxableIncomeForFederalIncomeTaxExemption	1.00
CY2017Q4	avb	Number Of Apartment Homes In Communities Owned NumberOfApartmentHomesInCommunitiesOwned	81517	home
CY2017Q4	avb	Number Of Apartment Homes Under Reconstruction NumberOfApartmentHomesUnderReconstruction	3752	home
CY2017Q4	avb	Number Of Communities With Apartments Under Reconstruction NumberOfCommunitiesWithApartmentsUnderReconstruction	9	community
CY2017Q4	avb	Number Of Owned Communities Under Construction NumberOfOwnedCommunitiesUnderConstruction	21	community
CY2017	avb	Numberof Communities Acquired NumberofCommunitiesAcquired	3	community
CY2017Q4	avb	Numberof Communities Heldfor Sale NumberofCommunitiesHeldforSale	0	community
CY2016	avb	Numberof Land Parcels Impaired NumberofLandParcelsImpaired	3	land_parcel
CY2017	avb	Numberof Land Parcels Sold NumberofLandParcelsSold	3	land_parcel
CY2017Q4	avb	Numberof Office Leases NumberofOfficeLeases	14	Lease
CY2015	avb	Operating Expenses From Assets Heldfor Sale Not Classifiedas Discontinued Operations OperatingExpensesFromAssetsHeldforSaleNotClassifiedasDiscontinuedOperations	36914000	USD
CY2016	avb	Operating Expenses From Assets Heldfor Sale Not Classifiedas Discontinued Operations OperatingExpensesFromAssetsHeldforSaleNotClassifiedasDiscontinuedOperations	26010000	USD
CY2017	avb	Operating Expenses From Assets Heldfor Sale Not Classifiedas Discontinued Operations OperatingExpensesFromAssetsHeldforSaleNotClassifiedasDiscontinuedOperations	8884000	USD
CY2015	avb	Payment For Redemption Of Preferred Interest Obligation PaymentForRedemptionOfPreferredInterestObligation	14410000	USD
CY2016	avb	Payment For Redemption Of Preferred Interest Obligation PaymentForRedemptionOfPreferredInterestObligation	1960000	USD
CY2017	avb	Payment For Redemption Of Preferred Interest Obligation PaymentForRedemptionOfPreferredInterestObligation	2000000	USD
CY2015	avb	Percentage Change Of Net Operating Income From Prior Year PercentageChangeOfNetOperatingIncomeFromPriorYear	0.130
CY2016	avb	Percentage Change Of Net Operating Income From Prior Year PercentageChangeOfNetOperatingIncomeFromPriorYear	0.138
CY2017	avb	Percentage Change Of Net Operating Income From Prior Year PercentageChangeOfNetOperatingIncomeFromPriorYear	0.077
CY2017	avb	Period Of Lease Life PeriodOfLeaseLife	P1Y
CY2015	avb	Real Estate Acquisitions Construction Costs And Improvements RealEstateAcquisitionsConstructionCostsAndImprovements	1667989000	USD
CY2016	avb	Real Estate Acquisitions Construction Costs And Improvements RealEstateAcquisitionsConstructionCostsAndImprovements	1788515000	USD
CY2017	avb	Real Estate Acquisitions Construction Costs And Improvements RealEstateAcquisitionsConstructionCostsAndImprovements	1526516000	USD
CY2016Q4	avb	Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements Net RealEstateAndAccumulatedDepreciationCarryingAmountOfLandAndBuildingsAndImprovementsNet	17032994000	USD
CY2017Q4	avb	Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements Net RealEstateAndAccumulatedDepreciationCarryingAmountOfLandAndBuildingsAndImprovementsNet	17717557000	USD
CY2015	avb	Real Estate Dispositions Including Impairment Loss On Planned Dispositions RealEstateDispositionsIncludingImpairmentLossOnPlannedDispositions	249206000	USD
CY2016	avb	Real Estate Dispositions Including Impairment Loss On Planned Dispositions RealEstateDispositionsIncludingImpairmentLossOnPlannedDispositions	279988000	USD
CY2017	avb	Real Estate Dispositions Including Impairment Loss On Planned Dispositions RealEstateDispositionsIncludingImpairmentLossOnPlannedDispositions	367206000	USD
CY2015Q4	avb	Real Estate Gross At Carrying Value Excluding Gross Real Estate Assets Held For Sale RealEstateGrossAtCarryingValueExcludingGrossRealEstateAssetsHeldForSale	19228571000	USD
CY2016Q4	avb	Real Estate Gross At Carrying Value Excluding Gross Real Estate Assets Held For Sale RealEstateGrossAtCarryingValueExcludingGrossRealEstateAssetsHeldForSale	20755780000	USD
CY2017Q4	avb	Real Estate Gross At Carrying Value Excluding Gross Real Estate Assets Held For Sale RealEstateGrossAtCarryingValueExcludingGrossRealEstateAssetsHeldForSale	21935936000	USD
CY2015	avb	Reconciliation Of Income From Book Basis To Tax Basis Casualty And Impairment Loss ReconciliationOfIncomeFromBookBasisToTaxBasisCasualtyAndImpairmentLoss	-10542000	USD
CY2016	avb	Reconciliation Of Income From Book Basis To Tax Basis Casualty And Impairment Loss ReconciliationOfIncomeFromBookBasisToTaxBasisCasualtyAndImpairmentLoss	-657000	USD
CY2017	avb	Reconciliation Of Income From Book Basis To Tax Basis Casualty And Impairment Loss ReconciliationOfIncomeFromBookBasisToTaxBasisCasualtyAndImpairmentLoss	6250000	USD
CY2015	avb	Reconciliation Of Income From Book Basis To Tax Basis Compensation Expense ReconciliationOfIncomeFromBookBasisToTaxBasisCompensationExpense	1244000	USD
CY2016	avb	Reconciliation Of Income From Book Basis To Tax Basis Compensation Expense ReconciliationOfIncomeFromBookBasisToTaxBasisCompensationExpense	-9821000	USD
CY2017	avb	Reconciliation Of Income From Book Basis To Tax Basis Compensation Expense ReconciliationOfIncomeFromBookBasisToTaxBasisCompensationExpense	3828000	USD
CY2015	avb	Reconciliation Of Income From Book Basis To Tax Basis Depreciation And Amortization ReconciliationOfIncomeFromBookBasisToTaxBasisDepreciationAndAmortization	-24657000	USD
CY2016	avb	Reconciliation Of Income From Book Basis To Tax Basis Depreciation And Amortization ReconciliationOfIncomeFromBookBasisToTaxBasisDepreciationAndAmortization	-947000	USD
CY2017	avb	Reconciliation Of Income From Book Basis To Tax Basis Depreciation And Amortization ReconciliationOfIncomeFromBookBasisToTaxBasisDepreciationAndAmortization	11868000	USD
CY2015	avb	Reconciliation Of Income From Book Basis To Tax Basis Gain On Sale Of Communities ReconciliationOfIncomeFromBookBasisToTaxBasisGainOnSaleOfCommunities	20900000	USD
CY2016	avb	Reconciliation Of Income From Book Basis To Tax Basis Gain On Sale Of Communities ReconciliationOfIncomeFromBookBasisToTaxBasisGainOnSaleOfCommunities	195029000	USD
CY2017	avb	Reconciliation Of Income From Book Basis To Tax Basis Gain On Sale Of Communities ReconciliationOfIncomeFromBookBasisToTaxBasisGainOnSaleOfCommunities	85873000	USD
CY2015	avb	Reconciliation Of Income From Book Basis To Tax Basis Mark To Market Interest ReconciliationOfIncomeFromBookBasisToTaxBasisMarkToMarketInterest	64676000	USD
CY2016	avb	Reconciliation Of Income From Book Basis To Tax Basis Mark To Market Interest ReconciliationOfIncomeFromBookBasisToTaxBasisMarkToMarketInterest	18985000	USD
CY2017	avb	Reconciliation Of Income From Book Basis To Tax Basis Mark To Market Interest ReconciliationOfIncomeFromBookBasisToTaxBasisMarkToMarketInterest	17430000	USD
CY2015	avb	Reconciliation Of Income From Book Basis To Tax Basis Net Income Loss Tax Basis ReconciliationOfIncomeFromBookBasisToTaxBasisNetIncomeLossTaxBasis	607190000	USD
CY2016	avb	Reconciliation Of Income From Book Basis To Tax Basis Net Income Loss Tax Basis ReconciliationOfIncomeFromBookBasisToTaxBasisNetIncomeLossTaxBasis	839738000	USD
CY2017	avb	Reconciliation Of Income From Book Basis To Tax Basis Net Income Loss Tax Basis ReconciliationOfIncomeFromBookBasisToTaxBasisNetIncomeLossTaxBasis	747527000	USD
CY2015	avb	Reconciliation Of Income From Book Basis To Tax Basis Other Adjustments ReconciliationOfIncomeFromBookBasisToTaxBasisOtherAdjustments	-12829000	USD
CY2016	avb	Reconciliation Of Income From Book Basis To Tax Basis Other Adjustments ReconciliationOfIncomeFromBookBasisToTaxBasisOtherAdjustments	11533000	USD
CY2017	avb	Reconciliation Of Income From Book Basis To Tax Basis Other Adjustments ReconciliationOfIncomeFromBookBasisToTaxBasisOtherAdjustments	-40381000	USD
CY2015	avb	Revenue From Assets Heldfor Sale Not Classifiedas Discontinued Operations RevenueFromAssetsHeldforSaleNotClassifiedasDiscontinuedOperations	96297000	USD
CY2016	avb	Revenue From Assets Heldfor Sale Not Classifiedas Discontinued Operations RevenueFromAssetsHeldforSaleNotClassifiedasDiscontinuedOperations	70273000	USD
CY2017	avb	Revenue From Assets Heldfor Sale Not Classifiedas Discontinued Operations RevenueFromAssetsHeldforSaleNotClassifiedasDiscontinuedOperations	23457000	USD
CY2017Q4	avb	Total Imputed Interest On Capital Leases Future Minimum Payments Due TotalImputedInterestOnCapitalLeasesFutureMinimumPaymentsDue	25961000	USD
CY2017Q4	avb	Total Leases Future Minimum Payments Due In Five Years TotalLeasesFutureMinimumPaymentsDueInFiveYears	21139000	USD
CY2017Q4	avb	Total Leases Future Minimum Payments Due In Four Years TotalLeasesFutureMinimumPaymentsDueInFourYears	21242000	USD
CY2017Q4	avb	Total Leases Future Minimum Payments Due In Three Years TotalLeasesFutureMinimumPaymentsDueInThreeYears	19858000	USD
CY2017Q4	avb	Total Leases Future Minimum Payments Due In Two Years TotalLeasesFutureMinimumPaymentsDueInTwoYears	22139000	USD
CY2017Q4	avb	Total Leases Future Minimum Payments Due Next Twelve Months TotalLeasesFutureMinimumPaymentsDueNextTwelveMonths	22124000	USD
CY2017Q4	avb	Total Leases Future Minimum Payments Due Thereafter TotalLeasesFutureMinimumPaymentsDueThereafter	1096784000	USD
CY2017	dei	Amendment Flag AmendmentFlag	false
CY2017	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2017	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2017	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2017
CY2017	dei	Document Period End Date DocumentPeriodEndDate	2017-12-31
CY2017	dei	Document Type DocumentType	10-K
CY2017	dei	Entity Central Index Key EntityCentralIndexKey	0000915912
CY2018Q1	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	138095504	shares
CY2017	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2017	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2017Q2	dei	Entity Public Float EntityPublicFloat	26425741640	USD
CY2017	dei	Entity Registrant Name EntityRegistrantName	AVALONBAY COMMUNITIES INC
CY2017	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2017	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes
CY2016Q4	us-gaap	Accrued Liabilities Current And Noncurrent AccruedLiabilitiesCurrentAndNoncurrent	274676000	USD
CY2017Q4	us-gaap	Accrued Liabilities Current And Noncurrent AccruedLiabilitiesCurrentAndNoncurrent	308189000	USD
CY2016Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-30510000	USD
CY2017Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-37419000	USD
CY2016Q4	us-gaap	Additional Paid In Capital AdditionalPaidInCapital	10105654000	USD
CY2017Q4	us-gaap	Additional Paid In Capital AdditionalPaidInCapital	10235475000	USD
CY2015	us-gaap	Adjustments Related To Tax Withholding For Share Based Compensation AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation	5979000	USD
CY2016	us-gaap	Adjustments Related To Tax Withholding For Share Based Compensation AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation	8356000	USD
CY2017	us-gaap	Adjustments Related To Tax Withholding For Share Based Compensation AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation	10542000	USD
CY2015	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	26258000	USD
CY2016	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	25140000	USD
CY2017	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	28200000	USD
CY2015	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	14703000	USD
CY2016	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	14666000	USD
CY2017	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	17085000	USD
CY2015	us-gaap	Amortization Of Debt Discount Premium AmortizationOfDebtDiscountPremium	-24261000	USD
CY2016	us-gaap	Amortization Of Debt Discount Premium AmortizationOfDebtDiscountPremium	-18866000	USD
CY2017	us-gaap	Amortization Of Debt Discount Premium AmortizationOfDebtDiscountPremium	-5915000	USD
CY2015	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	6871000	USD
CY2016	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	7661000	USD
CY2017	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	7657000	USD
CY2017	us-gaap	Amortization Period Of Deferred Gain Loss On Discontinuation Of Interest Rate Fair Value Hedge1 AmortizationPeriodOfDeferredGainLossOnDiscontinuationOfInterestRateFairValueHedge1	P10Y
CY2015	us-gaap	Asset Management Costs AssetManagementCosts	4370000	USD
CY2016	us-gaap	Asset Management Costs AssetManagementCosts	4822000	USD
CY2017	us-gaap	Asset Management Costs AssetManagementCosts	5936000	USD
CY2016Q4	us-gaap	Assets Assets	17867271000	USD
CY2017Q4	us-gaap	Assets Assets	18414821000	USD
CY2016Q4	us-gaap	Assets Of Disposal Group Including Discontinued Operation Current AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent	20846000	USD
CY2017Q4	us-gaap	Assets Of Disposal Group Including Discontinued Operation Current AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent	0	USD
CY2015	us-gaap	Business Combination Acquisition Related Costs BusinessCombinationAcquisitionRelatedCosts	6822000	USD
CY2016	us-gaap	Business Combination Acquisition Related Costs BusinessCombinationAcquisitionRelatedCosts	9922000	USD
CY2017	us-gaap	Business Combination Acquisition Related Costs BusinessCombinationAcquisitionRelatedCosts	2736000	USD
CY2016Q4	us-gaap	Capital Leased Assets Gross CapitalLeasedAssetsGross	39015000	USD
CY2017Q4	us-gaap	Capital Leased Assets Gross CapitalLeasedAssetsGross	19737000	USD
CY2017Q4	us-gaap	Capital Leases Future Minimum Payments Due Current CapitalLeasesFutureMinimumPaymentsDueCurrent	1073000	USD
CY2017Q4	us-gaap	Capital Leases Future Minimum Payments Due In Five Years CapitalLeasesFutureMinimumPaymentsDueInFiveYears	1082000	USD
CY2017Q4	us-gaap	Capital Leases Future Minimum Payments Due In Four Years CapitalLeasesFutureMinimumPaymentsDueInFourYears	1080000	USD
CY2017Q4	us-gaap	Capital Leases Future Minimum Payments Due In Three Years CapitalLeasesFutureMinimumPaymentsDueInThreeYears	1077000	USD
CY2017Q4	us-gaap	Capital Leases Future Minimum Payments Due In Two Years CapitalLeasesFutureMinimumPaymentsDueInTwoYears	1075000	USD
CY2017Q4	us-gaap	Capital Leases Future Minimum Payments Due Thereafter CapitalLeasesFutureMinimumPaymentsDueThereafter	43976000	USD
CY2015Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	400507000	USD
CY2016Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	214994000	USD
CY2017Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	67088000	USD
CY2014Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	605085000	USD
CY2015Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	505328000	USD
CY2016Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	329977000	USD
CY2017Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	201906000	USD
CY2015	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-99757000	USD
CY2016	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-175351000	USD
CY2017	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-128071000	USD
CY2016Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2017Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2015	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	5
CY2016	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	5.4
CY2017	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	5.68
CY2016Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2017Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2016Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	280000000	shares
CY2017Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	280000000	shares
CY2016Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	137330904	shares
CY2017Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	138094154	shares
CY2016Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	137330904	shares
CY2017Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	138094154	shares
CY2016Q4	us-gaap	Common Stock Value CommonStockValue	1373000	USD
CY2017Q4	us-gaap	Common Stock Value CommonStockValue	1381000	USD
CY2015	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	753166000	USD
CY2016	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	1034879000	USD
CY2017	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	870012000	USD
CY2016Q4	us-gaap	Construction In Progress Gross ConstructionInProgressGross	1882262000	USD
CY2017Q4	us-gaap	Construction In Progress Gross ConstructionInProgressGross	1306300000	USD
CY2016Q4	us-gaap	Construction Payable Current And Noncurrent ConstructionPayableCurrentAndNoncurrent	100998000	USD
CY2017Q4	us-gaap	Construction Payable Current And Noncurrent ConstructionPayableCurrentAndNoncurrent	85377000	USD
CY2017	us-gaap	Debt Instrument Redemption Price Percentage DebtInstrumentRedemptionPricePercentage	1
CY2015	us-gaap	Depreciation Depreciation	477923000	USD
CY2016	us-gaap	Depreciation Depreciation	531434000	USD
CY2017	us-gaap	Depreciation Depreciation	584150000	USD
CY2017	us-gaap	Derivative Instruments Gain Loss Reclassification From Accumulated Oci To Income Estimated Net Amount To Be Transferred DerivativeInstrumentsGainLossReclassificationFromAccumulatedOCIToIncomeEstimatedNetAmountToBeTransferred	376000	USD
CY2015	us-gaap	Derivative Instruments Loss Reclassified From Accumulated Oci Into Income Effective Portion DerivativeInstrumentsLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortion	5774000	USD
CY2016	us-gaap	Derivative Instruments Loss Reclassified From Accumulated Oci Into Income Effective Portion DerivativeInstrumentsLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortion	6433000	USD
CY2017	us-gaap	Derivative Instruments Loss Reclassified From Accumulated Oci Into Income Effective Portion DerivativeInstrumentsLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortion	7070000	USD
CY2015	us-gaap	Direct Costs Of Leased And Rented Property Or Equipment DirectCostsOfLeasedAndRentedPropertyOrEquipment	448747000	USD
CY2016	us-gaap	Direct Costs Of Leased And Rented Property Or Equipment DirectCostsOfLeasedAndRentedPropertyOrEquipment	478437000	USD
CY2017	us-gaap	Direct Costs Of Leased And Rented Property Or Equipment DirectCostsOfLeasedAndRentedPropertyOrEquipment	503946000	USD
CY2015	us-gaap	Dividends Common Stock DividendsCommonStock	673670000	USD
CY2016	us-gaap	Dividends Common Stock DividendsCommonStock	741313000	USD
CY2017	us-gaap	Dividends Common Stock DividendsCommonStock	783912000	USD
CY2015Q4	us-gaap	Dividends Payable Current And Noncurrent DividendsPayableCurrentAndNoncurrent	171257000	USD
CY2016Q4	us-gaap	Dividends Payable Current And Noncurrent DividendsPayableCurrentAndNoncurrent	185397000	USD
CY2017Q4	us-gaap	Dividends Payable Current And Noncurrent DividendsPayableCurrentAndNoncurrent	196094000	USD
CY2015	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	5.54
CY2016Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.73
CY2016Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.44
CY2016Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.60
CY2016Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.76
CY2016	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	7.53
CY2017Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.72
CY2017Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.20
CY2017Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.73
CY2017Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.72
CY2017	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	6.36
CY2015	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	5.51
CY2016Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.73
CY2016Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.44
CY2016Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.59
CY2016Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.76
CY2016	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	7.52
CY2017Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.72
CY2017Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.20
CY2017Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.72
CY2017Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.72
CY2017	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	6.35
CY2015	us-gaap	Employee Service Share Based Compensation Allocation Of Recognized Period Costs Capitalized Amount EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount	9667000	USD
CY2016	us-gaap	Employee Service Share Based Compensation Allocation Of Recognized Period Costs Capitalized Amount EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount	9266000	USD
CY2017	us-gaap	Employee Service Share Based Compensation Allocation Of Recognized Period Costs Capitalized Amount EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount	9474000	USD
CY2016Q4	us-gaap	Equity Method Investment Difference Between Carrying Amount And Underlying Equity EquityMethodInvestmentDifferenceBetweenCarryingAmountAndUnderlyingEquity	38015000	USD
CY2017Q4	us-gaap	Equity Method Investment Difference Between Carrying Amount And Underlying Equity EquityMethodInvestmentDifferenceBetweenCarryingAmountAndUnderlyingEquity	35402000	USD
CY2015	us-gaap	Equity Method Investment Realized Gain Loss On Disposal EquityMethodInvestmentRealizedGainLossOnDisposal	98899000	USD
CY2016	us-gaap	Equity Method Investment Realized Gain Loss On Disposal EquityMethodInvestmentRealizedGainLossOnDisposal	196749000	USD
CY2017	us-gaap	Equity Method Investment Realized Gain Loss On Disposal EquityMethodInvestmentRealizedGainLossOnDisposal	136333000	USD
CY2016Q4	us-gaap	Equity Method Investment Summarized Financial Information Assets EquityMethodInvestmentSummarizedFinancialInformationAssets	1004012000	USD
CY2017Q4	us-gaap	Equity Method Investment Summarized Financial Information Assets EquityMethodInvestmentSummarizedFinancialInformationAssets	735053000	USD
CY2016Q4	us-gaap	Equity Method Investment Summarized Financial Information Equity Or Capital EquityMethodInvestmentSummarizedFinancialInformationEquityOrCapital	297902000	USD
CY2017Q4	us-gaap	Equity Method Investment Summarized Financial Information Equity Or Capital EquityMethodInvestmentSummarizedFinancialInformationEquityOrCapital	200698000	USD
CY2016Q4	us-gaap	Equity Method Investment Summarized Financial Information Liabilities And Equity EquityMethodInvestmentSummarizedFinancialInformationLiabilitiesAndEquity	1004012000	USD
CY2017Q4	us-gaap	Equity Method Investment Summarized Financial Information Liabilities And Equity EquityMethodInvestmentSummarizedFinancialInformationLiabilitiesAndEquity	735053000	USD
CY2015	us-gaap	Equity Method Investment Summarized Financial Information Net Income Loss EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss	113674000	USD
CY2016	us-gaap	Equity Method Investment Summarized Financial Information Net Income Loss EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss	197348000	USD
CY2017	us-gaap	Equity Method Investment Summarized Financial Information Net Income Loss EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss	146364000	USD
CY2015	us-gaap	Equity Method Investment Summarized Financial Information Revenue EquityMethodInvestmentSummarizedFinancialInformationRevenue	173578000	USD
CY2016	us-gaap	Equity Method Investment Summarized Financial Information Revenue EquityMethodInvestmentSummarizedFinancialInformationRevenue	131901000	USD
CY2017	us-gaap	Equity Method Investment Summarized Financial Information Revenue EquityMethodInvestmentSummarizedFinancialInformationRevenue	101615000	USD
CY2015	us-gaap	Excise And Sales Taxes ExciseAndSalesTaxes	0	USD
CY2016	us-gaap	Excise And Sales Taxes ExciseAndSalesTaxes	0	USD
CY2017	us-gaap	Excise And Sales Taxes ExciseAndSalesTaxes	0	USD
CY2016Q4	us-gaap	Fixtures And Equipment Gross FixturesAndEquipmentGross	532994000	USD
CY2017Q4	us-gaap	Fixtures And Equipment Gross FixturesAndEquipmentGross	615288000	USD
CY2015	us-gaap	Gain Loss On Sale Of Other Assets GainLossOnSaleOfOtherAssets	9647000	USD
CY2016	us-gaap	Gain Loss On Sale Of Other Assets GainLossOnSaleOfOtherAssets	10224000	USD
CY2017	us-gaap	Gain Loss On Sale Of Other Assets GainLossOnSaleOfOtherAssets	-10907000	USD
CY2015	us-gaap	Gain Loss On Sale Of Properties GainLossOnSaleOfProperties	158852000	USD
CY2016	us-gaap	Gain Loss On Sale Of Properties GainLossOnSaleOfProperties	442916000	USD
CY2017	us-gaap	Gain Loss On Sale Of Properties GainLossOnSaleOfProperties	281745000	USD
CY2015	us-gaap	Gain On Business Interruption Insurance Recovery GainOnBusinessInterruptionInsuranceRecovery	1509000	USD
CY2016	us-gaap	Gain On Business Interruption Insurance Recovery GainOnBusinessInterruptionInsuranceRecovery	20564000	USD
CY2017	us-gaap	Gain On Business Interruption Insurance Recovery GainOnBusinessInterruptionInsuranceRecovery	3498000	USD
CY2017	us-gaap	Gain On Fair Value Hedge Ineffectiveness GainOnFairValueHedgeIneffectiveness	753000	USD
CY2015	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	26736000	USD
CY2016	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-7075000	USD
CY2017	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-25472000	USD
CY2015	us-gaap	Gains Losses On Sales Of Investment Real Estate GainsLossesOnSalesOfInvestmentRealEstate	115625000	USD
CY2016	us-gaap	Gains Losses On Sales Of Investment Real Estate GainsLossesOnSalesOfInvestmentRealEstate	374623000	USD
CY2017	us-gaap	Gains Losses On Sales Of Investment Real Estate GainsLossesOnSalesOfInvestmentRealEstate	252599000	USD
CY2015	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	42774000	USD
CY2016	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	45771000	USD
CY2017	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	50673000	USD
CY2015	us-gaap	Impairment Of Investments ImpairmentOfInvestments	0	USD
CY2016	us-gaap	Impairment Of Investments ImpairmentOfInvestments	0	USD
CY2017	us-gaap	Impairment Of Investments ImpairmentOfInvestments	0	USD
CY2015	us-gaap	Impairment Of Real Estate ImpairmentOfRealEstate	-10542000	USD
CY2016	us-gaap	Impairment Of Real Estate ImpairmentOfRealEstate	-3935000	USD
CY2017	us-gaap	Impairment Of Real Estate ImpairmentOfRealEstate	6250000	USD
CY2015	us-gaap	Income Loss Before Gain Or Loss On Sale Of Properties Extraordinary Items And Cumulative Effects Of Accounting Changes IncomeLossBeforeGainOrLossOnSaleOfPropertiesExtraordinaryItemsAndCumulativeEffectsOfAccountingChanges	547926000	USD
CY2016	us-gaap	Income Loss Before Gain Or Loss On Sale Of Properties Extraordinary Items And Cumulative Effects Of Accounting Changes IncomeLossBeforeGainOrLossOnSaleOfPropertiesExtraordinaryItemsAndCumulativeEffectsOfAccountingChanges	584204000	USD
CY2017	us-gaap	Income Loss Before Gain Or Loss On Sale Of Properties Extraordinary Items And Cumulative Effects Of Accounting Changes IncomeLossBeforeGainOrLossOnSaleOfPropertiesExtraordinaryItemsAndCumulativeEffectsOfAccountingChanges	564365000	USD
CY2015	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	743216000	USD
CY2016	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	1034013000	USD
CY2017	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	876801000	USD
CY2015	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	70018000	USD
CY2016	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	64962000	USD
CY2017	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	70744000	USD
CY2015	us-gaap	Income Loss From Equity Method Investments Net Of Dividends Or Distributions IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions	-12225000	USD
CY2016	us-gaap	Income Loss From Equity Method Investments Net Of Dividends Or Distributions IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions	-8870000	USD
CY2017	us-gaap	Income Loss From Equity Method Investments Net Of Dividends Or Distributions IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions	19798000	USD
CY2015	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	1483000	USD
CY2016	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	305000	USD
CY2017	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	141000	USD
CY2015	us-gaap	Increase Decrease In Accrued Liabilities IncreaseDecreaseInAccruedLiabilities	29189000	USD
CY2016	us-gaap	Increase Decrease In Accrued Liabilities IncreaseDecreaseInAccruedLiabilities	19386000	USD
CY2017	us-gaap	Increase Decrease In Accrued Liabilities IncreaseDecreaseInAccruedLiabilities	32754000	USD
CY2015	us-gaap	Increase Decrease In Construction Payables IncreaseDecreaseInConstructionPayables	-3230000	USD
CY2016	us-gaap	Increase Decrease In Construction Payables IncreaseDecreaseInConstructionPayables	2196000	USD
CY2017	us-gaap	Increase Decrease In Construction Payables IncreaseDecreaseInConstructionPayables	-15621000	USD
CY2016	us-gaap	Increase Decrease In Derivative Assets IncreaseDecreaseInDerivativeAssets	12085000	USD
CY2017	us-gaap	Increase Decrease In Derivative Assets IncreaseDecreaseInDerivativeAssets	-12114000	USD
CY2017	us-gaap	Increase Decrease In Derivative Liabilities IncreaseDecreaseInDerivativeLiabilities	1171000	USD
CY2015	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	-12783000	USD
CY2016	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	5403000	USD
CY2017	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	-3076000	USD
CY2015	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	79834000	USD
CY2016	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	78872000	USD
CY2017	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	64420000	USD
CY2015	us-gaap	Interest Expense InterestExpense	175615000	USD
CY2016	us-gaap	Interest Expense InterestExpense	187510000	USD
CY2017	us-gaap	Interest Expense InterestExpense	199661000	USD
CY2015	us-gaap	Interest Paid Net InterestPaidNet	188782000	USD
CY2016	us-gaap	Interest Paid Net InterestPaidNet	194059000	USD
CY2017	us-gaap	Interest Paid Net InterestPaidNet	207842000	USD
CY2016Q4	us-gaap	Interest Payable Current And Noncurrent InterestPayableCurrentAndNoncurrent	38307000	USD
CY2017Q4	us-gaap	Interest Payable Current And Noncurrent InterestPayableCurrentAndNoncurrent	43116000	USD
CY2016Q4	us-gaap	Investment Building And Building Improvements InvestmentBuildingAndBuildingImprovements	14314981000	USD
CY2017Q4	us-gaap	Investment Building And Building Improvements InvestmentBuildingAndBuildingImprovements	15708666000	USD
CY2016Q4	us-gaap	Investments In Affiliates Subsidiaries Associates And Joint Ventures InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures	175116000	USD
CY2017Q4	us-gaap	Investments In Affiliates Subsidiaries Associates And Joint Ventures InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures	163475000	USD
CY2016Q4	us-gaap	Land And Land Improvements LandAndLandImprovements	3941250000	USD
CY2017Q4	us-gaap	Land And Land Improvements LandAndLandImprovements	4237318000	USD
CY2016Q4	us-gaap	Land Available For Development LandAvailableForDevelopment	84293000	USD
CY2017Q4	us-gaap	Land Available For Development LandAvailableForDevelopment	68364000	USD
CY2015	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	21295000	USD
CY2016	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	23343000	USD
CY2017	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	23431000	USD
CY2016Q4	us-gaap	Liabilities Liabilities	7688089000	USD
CY2017Q4	us-gaap	Liabilities Liabilities	8020719000	USD
CY2016Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	17867271000	USD
CY2017Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	18414821000	USD
CY2016Q4	us-gaap	Liabilities Of Disposal Group Including Discontinued Operation LiabilitiesOfDisposalGroupIncludingDiscontinuedOperation	808000	USD
CY2017Q4	us-gaap	Liabilities Of Disposal Group Including Discontinued Operation LiabilitiesOfDisposalGroupIncludingDiscontinuedOperation	0	USD
CY2016Q4	us-gaap	Line Of Credit LineOfCredit	0	USD
CY2017Q4	us-gaap	Line Of Credit LineOfCredit	0	USD
CY2016Q4	us-gaap	Long Term Debt LongTermDebt	7076758000	USD
CY2017Q4	us-gaap	Long Term Debt LongTermDebt	7404313000	USD
CY2015	us-gaap	Management Fees Revenue ManagementFeesRevenue	9947000	USD
CY2016	us-gaap	Management Fees Revenue ManagementFeesRevenue	5599000	USD
CY2017	us-gaap	Management Fees Revenue ManagementFeesRevenue	4147000	USD
CY2015	us-gaap	Minority Interest Change In Redemption Value MinorityInterestChangeInRedemptionValue	965000	USD
CY2016	us-gaap	Minority Interest Change In Redemption Value MinorityInterestChangeInRedemptionValue	1489000	USD
CY2017	us-gaap	Minority Interest Change In Redemption Value MinorityInterestChangeInRedemptionValue	2026000	USD
CY2015	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	25093000	USD
CY2016	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-303271000	USD
CY2017	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-418947000	USD
CY2015	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-1199517000	USD
CY2016	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-1032352000	USD
CY2017	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-965381000	USD
CY2015	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	1074667000	USD
CY2016	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	1160272000	USD
CY2017	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	1256257000	USD
CY2015	us-gaap	Net Income Loss NetIncomeLoss	742038000	USD
CY2016	us-gaap	Net Income Loss NetIncomeLoss	1034002000	USD
CY2017	us-gaap	Net Income Loss NetIncomeLoss	876921000	USD
CY2015	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	-305000	USD
CY2016	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	-294000	USD
CY2017	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	-261000	USD
CY2015	us-gaap	Net Income Loss Attributable To Redeemable Noncontrolling Interest NetIncomeLossAttributableToRedeemableNoncontrollingInterest	-38000	USD
CY2016	us-gaap	Net Income Loss Attributable To Redeemable Noncontrolling Interest NetIncomeLossAttributableToRedeemableNoncontrollingInterest	-41000	USD
CY2017	us-gaap	Net Income Loss Attributable To Redeemable Noncontrolling Interest NetIncomeLossAttributableToRedeemableNoncontrollingInterest	-42000	USD
CY2015	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	742038000	USD
CY2016Q1	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	237931000	USD
CY2016Q2	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	197444000	USD
CY2016Q3	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	356392000	USD
CY2016Q4	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	242235000	USD
CY2016	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	1034002000	USD
CY2017Q1	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	235875000	USD
CY2017Q2	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	165225000	USD
CY2017Q3	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	238248000	USD
CY2017Q4	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	237573000	USD
CY2017	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	876921000	USD
CY2015	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	742076000	USD
CY2016	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	1034043000	USD
CY2017	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	876963000	USD
CY2015	us-gaap	Noncash Project Abandonment Costs NoncashProjectAbandonmentCosts	0	USD
CY2016	us-gaap	Noncash Project Abandonment Costs NoncashProjectAbandonmentCosts	1743000	USD
CY2017	us-gaap	Noncash Project Abandonment Costs NoncashProjectAbandonmentCosts	388000	USD
CY2016Q4	us-gaap	Notes Payable NotesPayable	7076758000	USD
CY2017Q4	us-gaap	Notes Payable NotesPayable	7404313000	USD
CY2017Q4	us-gaap	Number Of Real Estate Properties NumberOfRealEstateProperties	267	community
CY2017Q4	us-gaap	Number Of States In Which Entity Operates NumberOfStatesInWhichEntityOperates	12	state
CY2017Q4	us-gaap	Number Of Units In Real Estate Property NumberOfUnitsInRealEstateProperty	77614	home
CY2015	us-gaap	Operating Expenses OperatingExpenses	1308102000	USD
CY2016	us-gaap	Operating Expenses OperatingExpenses	1461051000	USD
CY2017	us-gaap	Operating Expenses OperatingExpenses	1594263000	USD
CY2015	us-gaap	Operating Income Loss OperatingIncomeLoss	1215742000	USD
CY2016	us-gaap	Operating Income Loss OperatingIncomeLoss	1383943000	USD
CY2017	us-gaap	Operating Income Loss OperatingIncomeLoss	1490068000	USD
CY2017Q4	us-gaap	Operating Leases Future Minimum Payments Due Current OperatingLeasesFutureMinimumPaymentsDueCurrent	21051000	USD
CY2017Q4	us-gaap	Operating Leases Future Minimum Payments Due In Five Years OperatingLeasesFutureMinimumPaymentsDueInFiveYears	20057000	USD
CY2017Q4	us-gaap	Operating Leases Future Minimum Payments Due In Four Years OperatingLeasesFutureMinimumPaymentsDueInFourYears	20162000	USD
CY2017Q4	us-gaap	Operating Leases Future Minimum Payments Due In Three Years OperatingLeasesFutureMinimumPaymentsDueInThreeYears	18781000	USD
CY2017Q4	us-gaap	Operating Leases Future Minimum Payments Due In Two Years OperatingLeasesFutureMinimumPaymentsDueInTwoYears	21064000	USD
CY2016	us-gaap	Payments For Proceeds From Real Estate Partnership Investment Net PaymentsForProceedsFromRealEstatePartnershipInvestmentNet	407000	USD
CY2017	us-gaap	Payments For Proceeds From Real Estate Partnership Investment Net PaymentsForProceedsFromRealEstatePartnershipInvestmentNet	418000	USD
CY2015	us-gaap	Payments Of Capital Distribution PaymentsOfCapitalDistribution	38000	USD
CY2016	us-gaap	Payments Of Capital Distribution PaymentsOfCapitalDistribution	41000	USD
CY2017	us-gaap	Payments Of Capital Distribution PaymentsOfCapitalDistribution	42000	USD
CY2015	us-gaap	Payments Of Dividends PaymentsOfDividends	655248000	USD
CY2017Q4	us-gaap	Operating Leases Future Minimum Payments Due Thereafter OperatingLeasesFutureMinimumPaymentsDueThereafter	1052808000	USD
CY2015	us-gaap	Operating Leases Income Statement Minimum Lease Revenue OperatingLeasesIncomeStatementMinimumLeaseRevenue	1846081000	USD
CY2016	us-gaap	Operating Leases Income Statement Minimum Lease Revenue OperatingLeasesIncomeStatementMinimumLeaseRevenue	2039656000	USD
CY2017	us-gaap	Operating Leases Income Statement Minimum Lease Revenue OperatingLeasesIncomeStatementMinimumLeaseRevenue	2154481000	USD
CY2015	us-gaap	Other Comprehensive Income Derivatives Qualifying As Hedges Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeDerivativesQualifyingAsHedgesNetOfTaxPortionAttributableToParent	5354000	USD
CY2016	us-gaap	Other Comprehensive Income Derivatives Qualifying As Hedges Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeDerivativesQualifyingAsHedgesNetOfTaxPortionAttributableToParent	-5556000	USD
CY2017	us-gaap	Other Comprehensive Income Derivatives Qualifying As Hedges Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeDerivativesQualifyingAsHedgesNetOfTaxPortionAttributableToParent	-13979000	USD
CY2015	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax	-5774000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax	-6433000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax	-7070000	USD
CY2016Q4	us-gaap	Other Deferred Costs Net OtherDeferredCostsNet	40179000	USD
CY2017Q4	us-gaap	Other Deferred Costs Net OtherDeferredCostsNet	45819000	USD
CY2015	us-gaap	Payments For Capital Improvements PaymentsForCapitalImprovements	48170000	USD
CY2016	us-gaap	Payments For Capital Improvements PaymentsForCapitalImprovements	66971000	USD
CY2017	us-gaap	Payments For Capital Improvements PaymentsForCapitalImprovements	65181000	USD
CY2017Q2	us-gaap	Payments For Proceeds From Hedge Financing Activities PaymentsForProceedsFromHedgeFinancingActivities	2326000	USD
CY2017Q2	us-gaap	Payments For Proceeds From Hedge Financing Activities PaymentsForProceedsFromHedgeFinancingActivities	-4078000	USD
CY2017Q2	us-gaap	Payments For Proceeds From Hedge Financing Activities PaymentsForProceedsFromHedgeFinancingActivities	1361000	USD
CY2015	us-gaap	Payments For Proceeds From Hedge Financing Activities PaymentsForProceedsFromHedgeFinancingActivities	0	USD
CY2016	us-gaap	Payments For Proceeds From Hedge Financing Activities PaymentsForProceedsFromHedgeFinancingActivities	14847000	USD
CY2017	us-gaap	Payments For Proceeds From Hedge Financing Activities PaymentsForProceedsFromHedgeFinancingActivities	-391000	USD
CY2015	us-gaap	Payments For Proceeds From Real Estate Partnership Investment Net PaymentsForProceedsFromRealEstatePartnershipInvestmentNet	372000	USD
CY2016	us-gaap	Payments Of Dividends PaymentsOfDividends	726749000	USD
CY2017	us-gaap	Payments Of Dividends PaymentsOfDividends	772657000	USD
CY2015	us-gaap	Payments Of Financing Costs PaymentsOfFinancingCosts	7343000	USD
CY2016	us-gaap	Payments Of Financing Costs PaymentsOfFinancingCosts	16240000	USD
CY2017	us-gaap	Payments Of Financing Costs PaymentsOfFinancingCosts	17552000	USD
CY2015	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	6076000	USD
CY2016	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	8562000	USD
CY2017	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	10450000	USD
CY2015	us-gaap	Payments To Acquire Businesses And Interest In Affiliates PaymentsToAcquireBusinessesAndInterestInAffiliates	6582000	USD
CY2016	us-gaap	Payments To Acquire Businesses And Interest In Affiliates PaymentsToAcquireBusinessesAndInterestInAffiliates	9750000	USD
CY2017	us-gaap	Payments To Acquire Businesses And Interest In Affiliates PaymentsToAcquireBusinessesAndInterestInAffiliates	24493000	USD
CY2015	us-gaap	Payments To Acquire Mortgage Notes Receivable PaymentsToAcquireMortgageNotesReceivable	0	USD
CY2016	us-gaap	Payments To Acquire Mortgage Notes Receivable PaymentsToAcquireMortgageNotesReceivable	19115000	USD
CY2017	us-gaap	Payments To Acquire Mortgage Notes Receivable PaymentsToAcquireMortgageNotesReceivable	17590000	USD
CY2015	us-gaap	Payments To Acquire Other Real Estate PaymentsToAcquireOtherRealEstate	0	USD
CY2016	us-gaap	Payments To Acquire Other Real Estate PaymentsToAcquireOtherRealEstate	393316000	USD
CY2017	us-gaap	Payments To Acquire Other Real Estate PaymentsToAcquireOtherRealEstate	462317000	USD
CY2015	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	7695000	USD
CY2016	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	5881000	USD
CY2017	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	8809000	USD
CY2015	us-gaap	Payments To Develop Real Estate Assets PaymentsToDevelopRealEstateAssets	1569326000	USD
CY2016	us-gaap	Payments To Develop Real Estate Assets PaymentsToDevelopRealEstateAssets	1201026000	USD
CY2017	us-gaap	Payments To Develop Real Estate Assets PaymentsToDevelopRealEstateAssets	979947000	USD
CY2015	us-gaap	Payments To Minority Shareholders PaymentsToMinorityShareholders	1088000	USD
CY2016	us-gaap	Payments To Minority Shareholders PaymentsToMinorityShareholders	0	USD
CY2017	us-gaap	Payments To Minority Shareholders PaymentsToMinorityShareholders	0	USD
CY2017Q4	us-gaap	Pledged Assets Not Separately Reported Real Estate PledgedAssetsNotSeparatelyReportedRealEstate	2293583000	USD
CY2016Q4	us-gaap	Preferred Stock Liquidation Preference PreferredStockLiquidationPreference	25
CY2017Q4	us-gaap	Preferred Stock Liquidation Preference PreferredStockLiquidationPreference	25
CY2016Q4	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	0.01
CY2017Q4	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	0.01
CY2016Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	50000000	shares
CY2017Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	50000000	shares
CY2016Q4	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	0	shares
CY2017Q4	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	0	shares
CY2016Q4	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	0	shares
CY2017Q4	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	0	shares
CY2016Q4	us-gaap	Preferred Stock Value PreferredStockValue	0	USD
CY2017Q4	us-gaap	Preferred Stock Value PreferredStockValue	0	USD
CY2016Q4	us-gaap	Prepaid Expense And Other Assets PrepaidExpenseAndOtherAssets	256934000	USD
CY2017Q4	us-gaap	Prepaid Expense And Other Assets PrepaidExpenseAndOtherAssets	253378000	USD
CY2015	us-gaap	Proceeds From Distributions Received From Real Estate Partnerships ProceedsFromDistributionsReceivedFromRealEstatePartnerships	0	USD
CY2016	us-gaap	Proceeds From Distributions Received From Real Estate Partnerships ProceedsFromDistributionsReceivedFromRealEstatePartnerships	0	USD
CY2017	us-gaap	Proceeds From Distributions Received From Real Estate Partnerships ProceedsFromDistributionsReceivedFromRealEstatePartnerships	1038000	USD
CY2015	us-gaap	Proceeds From Insurance Settlement Investing Activities ProceedsFromInsuranceSettlementInvestingActivities	44142000	USD
CY2016	us-gaap	Proceeds From Insurance Settlement Investing Activities ProceedsFromInsuranceSettlementInvestingActivities	17196000	USD
CY2017	us-gaap	Proceeds From Insurance Settlement Investing Activities ProceedsFromInsuranceSettlementInvestingActivities	16233000	USD
CY2015	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	690184000	USD
CY2016	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	15526000	USD
CY2017	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	111093000	USD
CY2015	us-gaap	Proceeds From Legal Settlements ProceedsFromLegalSettlements	417000	USD
CY2016	us-gaap	Proceeds From Legal Settlements ProceedsFromLegalSettlements	0	USD
CY2017	us-gaap	Proceeds From Legal Settlements ProceedsFromLegalSettlements	6118000	USD
CY2015	us-gaap	Proceeds From Notes Payable ProceedsFromNotesPayable	0	USD
CY2016	us-gaap	Proceeds From Notes Payable ProceedsFromNotesPayable	0	USD
CY2017	us-gaap	Proceeds From Notes Payable ProceedsFromNotesPayable	206800000	USD
CY2015	us-gaap	Proceeds From Sale Of Equity Method Investments ProceedsFromSaleOfEquityMethodInvestments	109181000	USD
CY2016	us-gaap	Proceeds From Sale Of Equity Method Investments ProceedsFromSaleOfEquityMethodInvestments	111598000	USD
CY2017	us-gaap	Proceeds From Sale Of Equity Method Investments ProceedsFromSaleOfEquityMethodInvestments	89305000	USD
CY2015	us-gaap	Proceeds From Sale Of Real Estate Heldforinvestment ProceedsFromSaleOfRealEstateHeldforinvestment	282163000	USD
CY2016	us-gaap	Proceeds From Sale Of Real Estate Heldforinvestment ProceedsFromSaleOfRealEstateHeldforinvestment	532717000	USD
CY2017	us-gaap	Proceeds From Sale Of Real Estate Heldforinvestment ProceedsFromSaleOfRealEstateHeldforinvestment	503039000	USD
CY2017Q1	us-gaap	Profit Loss ProfitLoss	235781000	USD
CY2017Q2	us-gaap	Profit Loss ProfitLoss	165194000	USD
CY2017Q3	us-gaap	Profit Loss ProfitLoss	238199000	USD
CY2017Q4	us-gaap	Profit Loss ProfitLoss	237486000	USD
CY2017	us-gaap	Profit Loss ProfitLoss	876660000	USD
CY2014Q4	us-gaap	Real Estate Accumulated Depreciation RealEstateAccumulatedDepreciation	2913576000	USD
CY2015Q4	us-gaap	Real Estate Accumulated Depreciation RealEstateAccumulatedDepreciation	3325790000	USD
CY2016Q4	us-gaap	Real Estate Accumulated Depreciation RealEstateAccumulatedDepreciation	3743632000	USD
CY2017Q4	us-gaap	Real Estate Accumulated Depreciation RealEstateAccumulatedDepreciation	4218379000	USD
CY2015	us-gaap	Real Estate Accumulated Depreciation Real Estate Sold RealEstateAccumulatedDepreciationRealEstateSold	65709000	USD
CY2016	us-gaap	Real Estate Accumulated Depreciation Real Estate Sold RealEstateAccumulatedDepreciationRealEstateSold	113592000	USD
CY2017	us-gaap	Real Estate Accumulated Depreciation Real Estate Sold RealEstateAccumulatedDepreciationRealEstateSold	109403000	USD
CY2017Q4	us-gaap	Real Estate And Accumulated Depreciation Amount Of Encumbrances RealEstateAndAccumulatedDepreciationAmountOfEncumbrances	7404313000	USD
CY2017Q4	us-gaap	Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements	17630254000	USD
CY2017Q4	us-gaap	Real Estate And Accumulated Depreciation Carrying Amount Of Land RealEstateAndAccumulatedDepreciationCarryingAmountOfLand	4305682000	USD
CY2015	us-gaap	Proceeds From Unsecured Notes Payable ProceedsFromUnsecuredNotesPayable	873088000	USD
CY2016	us-gaap	Proceeds From Unsecured Notes Payable ProceedsFromUnsecuredNotesPayable	1122488000	USD
CY2017	us-gaap	Proceeds From Unsecured Notes Payable ProceedsFromUnsecuredNotesPayable	1696826000	USD
CY2015	us-gaap	Profit Loss ProfitLoss	741733000	USD
CY2016Q1	us-gaap	Profit Loss ProfitLoss	237877000	USD
CY2016Q2	us-gaap	Profit Loss ProfitLoss	197319000	USD
CY2016Q3	us-gaap	Profit Loss ProfitLoss	356329000	USD
CY2016Q4	us-gaap	Profit Loss ProfitLoss	242183000	USD
CY2016	us-gaap	Profit Loss ProfitLoss	1033708000	USD
CY2017Q4	us-gaap	Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Carrying Costs RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts	2946017000	USD
CY2017Q4	us-gaap	Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements	14684237000	USD
CY2017Q4	us-gaap	Real Estate And Accumulated Depreciation Initial Cost Of Land RealEstateAndAccumulatedDepreciationInitialCostOfLand	4305682000	USD
CY2017Q4	us-gaap	Real Estate Federal Income Tax Basis RealEstateFederalIncomeTaxBasis	21271000	USD
CY2014Q4	us-gaap	Real Estate Gross At Carrying Value RealEstateGrossAtCarryingValue	17849316000	USD
CY2015Q4	us-gaap	Real Estate Gross At Carrying Value RealEstateGrossAtCarryingValue	19268099000	USD
CY2016Q4	us-gaap	Real Estate Gross At Carrying Value RealEstateGrossAtCarryingValue	20776626000	USD
CY2017Q4	us-gaap	Real Estate Gross At Carrying Value RealEstateGrossAtCarryingValue	21935936000	USD
CY2015Q4	us-gaap	Real Estate Heldforsale RealEstateHeldforsale	39528000	USD
CY2016Q4	us-gaap	Real Estate Heldforsale RealEstateHeldforsale	20846000	USD
CY2016Q4	us-gaap	Real Estate Investment Property Accumulated Depreciation RealEstateInvestmentPropertyAccumulatedDepreciation	3743632000	USD
CY2017Q4	us-gaap	Real Estate Investment Property Accumulated Depreciation RealEstateInvestmentPropertyAccumulatedDepreciation	4218379000	USD
CY2016Q4	us-gaap	Real Estate Investment Property At Cost RealEstateInvestmentPropertyAtCost	18789225000	USD
CY2017Q4	us-gaap	Real Estate Investment Property At Cost RealEstateInvestmentPropertyAtCost	20561272000	USD
CY2016Q4	us-gaap	Real Estate Investment Property Net RealEstateInvestmentPropertyNet	15045593000	USD
CY2017Q4	us-gaap	Real Estate Investment Property Net RealEstateInvestmentPropertyNet	16342893000	USD
CY2016Q4	us-gaap	Real Estate Investments RealEstateInvestments	17032994000	USD
CY2017Q4	us-gaap	Real Estate Investments RealEstateInvestments	17717557000	USD
CY2015	us-gaap	Real Estate Tax Expense RealEstateTaxExpense	193499000	USD
CY2016	us-gaap	Real Estate Tax Expense RealEstateTaxExpense	204837000	USD
CY2017	us-gaap	Real Estate Tax Expense RealEstateTaxExpense	221375000	USD
CY2016Q4	us-gaap	Redeemable Noncontrolling Interest Equity Common Carrying Amount RedeemableNoncontrollingInterestEquityCommonCarryingAmount	7766000	USD
CY2017Q4	us-gaap	Redeemable Noncontrolling Interest Equity Common Carrying Amount RedeemableNoncontrollingInterestEquityCommonCarryingAmount	6056000	USD
CY2015	us-gaap	Repayments Of Long Term Capital Lease Obligations RepaymentsOfLongTermCapitalLeaseObligations	0	USD
CY2016	us-gaap	Repayments Of Long Term Capital Lease Obligations RepaymentsOfLongTermCapitalLeaseObligations	0	USD
CY2017	us-gaap	Repayments Of Long Term Capital Lease Obligations RepaymentsOfLongTermCapitalLeaseObligations	18951000	USD
CY2015	us-gaap	Repayments Of Notes Payable RepaymentsOfNotesPayable	853604000	USD
CY2016	us-gaap	Repayments Of Notes Payable RepaymentsOfNotesPayable	168076000	USD
CY2017	us-gaap	Repayments Of Notes Payable RepaymentsOfNotesPayable	1313025000	USD
CY2015	us-gaap	Repayments Of Unsecured Debt RepaymentsOfUnsecuredDebt	0	USD
CY2016	us-gaap	Repayments Of Unsecured Debt RepaymentsOfUnsecuredDebt	504403000	USD
CY2017	us-gaap	Repayments Of Unsecured Debt RepaymentsOfUnsecuredDebt	300000000	USD
CY2015Q4	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	104821000	USD
CY2016Q4	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	114983000	USD
CY2017Q4	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	134818000	USD
CY2016Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	94899000	USD
CY2017Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	188609000	USD
CY2015	us-gaap	Revenues Revenues	1856028000	USD
CY2016Q1	us-gaap	Revenues Revenues	508498000	USD
CY2016Q2	us-gaap	Revenues Revenues	502307000	USD
CY2016Q3	us-gaap	Revenues Revenues	516211000	USD
CY2016Q4	us-gaap	Revenues Revenues	518240000	USD
CY2016	us-gaap	Revenues Revenues	2045255000	USD
CY2017Q1	us-gaap	Revenues Revenues	522326000	USD
CY2017Q2	us-gaap	Revenues Revenues	530512000	USD
CY2017Q3	us-gaap	Revenues Revenues	550500000	USD
CY2017Q4	us-gaap	Revenues Revenues	555292000	USD
CY2017	us-gaap	Revenues Revenues	2158628000	USD
CY2015	us-gaap	Sec Schedule Iii Real Estate Accumulated Depreciation Depreciation Expense SECScheduleIIIRealEstateAccumulatedDepreciationDepreciationExpense	477923000	USD
CY2016	us-gaap	Sec Schedule Iii Real Estate Accumulated Depreciation Depreciation Expense SECScheduleIIIRealEstateAccumulatedDepreciationDepreciationExpense	531434000	USD
CY2017	us-gaap	Sec Schedule Iii Real Estate Accumulated Depreciation Depreciation Expense SECScheduleIIIRealEstateAccumulatedDepreciationDepreciationExpense	584150000	USD
CY2016Q4	us-gaap	Secured Debt SecuredDebt	2567578000	USD
CY2017Q4	us-gaap	Secured Debt SecuredDebt	1476706000	USD
CY2016Q4	us-gaap	Security Deposit SecurityDeposit	32071000	USD
CY2017Q4	us-gaap	Security Deposit SecurityDeposit	32686000	USD
CY2016Q4	us-gaap	Security Deposit Liability SecurityDepositLiability	57023000	USD
CY2017Q4	us-gaap	Security Deposit Liability SecurityDepositLiability	58473000	USD
CY2015	us-gaap	Share Based Compensation ShareBasedCompensation	15321000	USD
CY2016	us-gaap	Share Based Compensation ShareBasedCompensation	15082000	USD
CY2017	us-gaap	Share Based Compensation ShareBasedCompensation	17920000	USD
CY2015	us-gaap	Shares Paid For Tax Withholding For Share Based Compensation SharesPaidForTaxWithholdingForShareBasedCompensation	45090	shares
CY2016	us-gaap	Shares Paid For Tax Withholding For Share Based Compensation SharesPaidForTaxWithholdingForShareBasedCompensation	53453	shares
CY2017	us-gaap	Shares Paid For Tax Withholding For Share Based Compensation SharesPaidForTaxWithholdingForShareBasedCompensation	60319	shares
CY2015	us-gaap	Stock Issued During Period Shares Dividend Reinvestment Plan StockIssuedDuringPeriodSharesDividendReinvestmentPlan	2142	shares
CY2016	us-gaap	Stock Issued During Period Shares Dividend Reinvestment Plan StockIssuedDuringPeriodSharesDividendReinvestmentPlan	2396	shares
CY2017	us-gaap	Stock Issued During Period Shares Dividend Reinvestment Plan StockIssuedDuringPeriodSharesDividendReinvestmentPlan	3058	shares
CY2017	us-gaap	Stock Issued During Period Shares Employee Stock Purchase Plans StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans	11528	shares
CY2017	us-gaap	Stock Issued During Period Shares Share Based Compensation Forfeited StockIssuedDuringPeriodSharesShareBasedCompensationForfeited	3388	shares
CY2017	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	42123	shares
CY2015	us-gaap	Stock Issued During Period Value Dividend Reinvestment Plan StockIssuedDuringPeriodValueDividendReinvestmentPlan	372000	USD
CY2016	us-gaap	Stock Issued During Period Value Dividend Reinvestment Plan StockIssuedDuringPeriodValueDividendReinvestmentPlan	424000	USD
CY2017	us-gaap	Stock Issued During Period Value Dividend Reinvestment Plan StockIssuedDuringPeriodValueDividendReinvestmentPlan	558000	USD
CY2015	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	687402000	USD
CY2016	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	10695000	USD
CY2017	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	100304000	USD
CY2015	us-gaap	Stock Issued During Period Value Share Based Compensation Forfeited StockIssuedDuringPeriodValueShareBasedCompensationForfeited	726000	USD
CY2016	us-gaap	Stock Issued During Period Value Share Based Compensation Forfeited StockIssuedDuringPeriodValueShareBasedCompensationForfeited	694000	USD
CY2017	us-gaap	Stock Issued During Period Value Share Based Compensation Forfeited StockIssuedDuringPeriodValueShareBasedCompensationForfeited	588000	USD
CY2014Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	9046405000	USD
CY2015Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	9840526000	USD
CY2016Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	10171416000	USD
CY2017Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	10388046000	USD
CY2015	us-gaap	Undistributed Earnings UndistributedEarnings	740264000	USD
CY2016	us-gaap	Undistributed Earnings UndistributedEarnings	1031392000	USD
CY2017	us-gaap	Undistributed Earnings UndistributedEarnings	874458000	USD
CY2015	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Basic UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic	1774000	USD
CY2016	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Basic UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic	2610000	USD
CY2017	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Basic UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic	2463000	USD
CY2016Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	0	USD
CY2017Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	0	USD
CY2016Q4	us-gaap	Unsecured Debt UnsecuredDebt	4463302000	USD
CY2017Q4	us-gaap	Unsecured Debt UnsecuredDebt	5852764000	USD
CY2015	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	1019966	shares
CY2016	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	525886	shares
CY2017	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	535415	shares
CY2015	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	134593177	shares
CY2016	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	137461637	shares
CY2017	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	138066686	shares
CY2015	us-gaap	Weighted Average Number Of Limited Partnership And General Partnership Unit Outstanding Basic And Diluted WeightedAverageNumberOfLimitedPartnershipAndGeneralPartnershipUnitOutstandingBasicAndDiluted	7500	shares
CY2016	us-gaap	Weighted Average Number Of Limited Partnership And General Partnership Unit Outstanding Basic And Diluted WeightedAverageNumberOfLimitedPartnershipAndGeneralPartnershipUnitOutstandingBasicAndDiluted	7500	shares
CY2017	us-gaap	Weighted Average Number Of Limited Partnership And General Partnership Unit Outstanding Basic And Diluted WeightedAverageNumberOfLimitedPartnershipAndGeneralPartnershipUnitOutstandingBasicAndDiluted	7500	shares
CY2015	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	133565711	shares
CY2016	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	136928251	shares
CY2017	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	137523771	shares
CY2017	us-gaap	Prior Period Reclassification Adjustment Description PriorPeriodReclassificationAdjustmentDescription	<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;text-align:justify;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-style:italic;">Reclassifications</font></div><div style="line-height:120%;text-align:justify;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div><div style="line-height:120%;text-align:justify;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Certain reclassifications have been made to amounts in prior years' notes to financial statements to conform to current year presentations as a result of changes in held for sale classification and disposition activity.</font></div></div>
CY2017	us-gaap	Use Of Estimates UseOfEstimates	<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;text-align:justify;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-style:italic;">Use of Estimates</font></div><div style="line-height:120%;text-align:justify;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div><div style="line-height:120%;text-align:justify;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">The preparation of financial statements in conformity with GAAP requires management to make certain estimates and assumptions. These estimates and assumptions affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the dates of the financial statements and the reported amounts of revenue and expenses during the reporting periods. Actual results could differ from those estimates.</font></div></div>

Files In Submission

Name	View Source	Status
0000915912-18-000004-index-headers.html	Edgar Link	pending
0000915912-18-000004-index.html	Edgar Link	pending
0000915912-18-000004.txt	Edgar Link	pending
0000915912-18-000004-xbrl.zip	Edgar Link	pending
a201710-k.htm	Edgar Link	pending
avb-20171231.xml	Edgar Link	completed
avb-20171231.xsd	Edgar Link	pending
avb-20171231_cal.xml	Edgar Link	unprocessable
avb-20171231_def.xml	Edgar Link	unprocessable
avb-20171231_lab.xml	Edgar Link	unprocessable
avb-20171231_pre.xml	Edgar Link	unprocessable
ex-1212017.htm	Edgar Link	pending
ex-2112017.htm	Edgar Link	pending
ex-2312017.htm	Edgar Link	pending
ex-3112017.htm	Edgar Link	pending
ex-3122017.htm	Edgar Link	pending
ex-322017.htm	Edgar Link	pending
FilingSummary.xml	Edgar Link	unprocessable
Financial_Report.xlsx	Edgar Link	pending
R1.htm	Edgar Link	pending
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report.css	Edgar Link	pending
Show.js	Edgar Link	pending

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2016 Q4 Form 10-K Financial Statement

#000091591218000004 Filed on February 23, 2018

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$AVB AVALONBAY COMMUNITIES INC Stock $avb

2016 Q4 Form 10-K Financial Statement

#000091591218000004 Filed on February 23, 2018

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

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AVALONBAY COMMUNITIES INC Stock $avb