Fair Value Assets Measured On Recurring Basis.

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Fair Value Liabilities Measured On Recurring Basis Variable Rate Unsecured Debt Instruments.

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Secured debt including debt on real estate held for sale.

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Fair value transfers between the levels.

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Fair value of unsecured debt instruments as of the balance sheet date.

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Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Unsecured short-term debt instrument issued by corporations which are highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months.

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Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

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Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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Fair value, after offset of derivative liability, of financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, before offset against an obligation to return collateral under a master netting arrangement. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

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Fair value, after offset of derivative asset, of financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, elected not to be and before offset against a right to receive collateral under a master netting arrangement. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

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Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Fair value of financial and nonfinancial obligations.

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Amount, after allowance for credit loss, of financing receivable. Excludes financing receivable covered under loss sharing agreement.

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As of the reporting date, the aggregate carrying amount of all noncontrolling interests which are redeemable by the (parent) entity (1) at a fixed or determinable price on a fixed or determinable date, (2) at the option of the holder of the noncontrolling interest, or (3) upon occurrence of an event that is not solely within the control of the (parent) entity. This item includes noncontrolling interest holder's ownership (or holders' ownership) regardless of the type of equity interest (common, preferred, other) including all potential organizational (legal) forms of the investee entity.

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FAIR VALUE OF DERIVATIVES AND FINANCIAL INSTRUMENTS (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Nov. 30, 2019	Dec. 31, 2018	Dec. 31, 2017
Fair Value
Notes receivable, net	$ 153,650		$ 42,259
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis
Gross Amounts of Recognized Assets	6		4,757
Gross Amounts of Recognized Liabilities	142		356
Unsecured debt instruments
Redeemable Noncontrolling Interest, Equity, Carrying Amount	1,018,665		972,740	$ 948,138
Redeemable noncontrolling interests in the Operating Partnership and DownREIT Partnership	1,018,665		972,740
Transfer Between the Levels	0
Carrying Amount \| Fair Value, Measurements, Recurring
Fair Value
Notes receivable, net	153,650		42,259
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis
Total assets	153,656		47,016
Unsecured debt instruments
Total liabilities	4,731,595		3,566,018
Redeemable noncontrolling interests in the Operating Partnership and DownREIT Partnership	1,018,665		972,740
Carrying Amount \| Interest rate contracts \| Fair Value, Measurements, Recurring
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis
Derivative Asset Designated as Hedging Instrument, Fair Value	6		4,757
Derivatives - Interest rate contracts (b)	142		356
Carrying Amount \| Credit facilities \| Fair Value, Measurements, Recurring
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis
Secured debt including debt on real estate held for sale	218,490
Carrying Amount \| Commercial bank \| Fair Value, Measurements, Recurring
Unsecured debt instruments
Unsecured debt instruments	16,583		16
Commercial paper program	300,000		101,115
Carrying Amount \| Senior Unsecured Notes \| Fair Value, Measurements, Recurring
Unsecured debt instruments
Unsecured debt instruments	3,263,152		2,861,842
Fair Value \| Fair Value, Measurements, Recurring
Fair Value
Notes receivable, net	160,197		45,026
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis
Total assets	160,203		49,783
Unsecured debt instruments
Total liabilities	4,853,337		3,532,104
Redeemable noncontrolling interests in the Operating Partnership and DownREIT Partnership	1,018,665		972,740
Fair Value \| Interest rate contracts \| Fair Value, Measurements, Recurring
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis
Derivative Asset Designated as Hedging Instrument, Fair Value	6		4,757
Derivatives - Interest rate contracts (b)	142		356
Fair Value \| Tax-exempt secured notes payable \| Fair Value, Measurements, Recurring
Debt instruments - fair value
Fair value			94,700
Fair Value \| Credit facilities \| Fair Value, Measurements, Recurring
Debt instruments - fair value
Fair value	213,661
Fair Value \| Commercial bank \| Fair Value, Measurements, Recurring
Unsecured debt instruments
Unsecured debt instruments	16,583		16
Commercial paper program	300,000		101,115
Fair Value \| Senior Unsecured Notes \| Fair Value, Measurements, Recurring
Unsecured debt instruments
Unsecured debt instruments	3,397,622		2,829,390
Fair Value \| Level 2 \| Fair Value, Measurements, Recurring
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis
Total assets	6		4,757
Unsecured debt instruments
Total liabilities	142		356
Redeemable noncontrolling interests in the Operating Partnership and DownREIT Partnership	1,018,665		972,740
Fair Value \| Level 2 \| Interest rate contracts \| Fair Value, Measurements, Recurring
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis
Derivative Asset Designated as Hedging Instrument, Fair Value	6		4,757
Derivatives - Interest rate contracts (b)	142		356
Fair Value \| Level 3 \| Fair Value, Measurements, Recurring
Fair Value
Notes receivable, net	160,197		45,026
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis
Total assets	160,197		45,026
Unsecured debt instruments
Total liabilities	4,853,195		3,531,748
Fair Value \| Level 3 \| Credit facilities \| Fair Value, Measurements, Recurring
Debt instruments - fair value
Fair value	213,661
Fair Value \| Level 3 \| Commercial bank \| Fair Value, Measurements, Recurring
Unsecured debt instruments
Unsecured debt instruments	16,583		16
Commercial paper program	300,000		101,115
Fair Value \| Level 3 \| Senior Unsecured Notes \| Fair Value, Measurements, Recurring
Unsecured debt instruments
Unsecured debt instruments	3,397,622		2,829,390
Fixed Rate Debt \| Credit facilities
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis
Secured debt including debt on real estate held for sale	204,590		90,000
Fixed Rate Debt \| Carrying Amount \| Mortgages Notes Payable \| Fair Value, Measurements, Recurring
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis
Secured debt including debt on real estate held for sale	906,228		417,989
Fixed Rate Debt \| Fair Value \| Mortgages Notes Payable \| Fair Value, Measurements, Recurring
Debt instruments - fair value
Fair value	898,329		416,314
Fixed Rate Debt \| Fair Value \| Level 3 \| Mortgages Notes Payable \| Fair Value, Measurements, Recurring
Debt instruments - fair value
Fair value	898,329		416,314
Variable Rate Debt \| Carrying Amount \| Tax-exempt secured notes payable \| Fair Value, Measurements, Recurring
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis
Secured debt including debt on real estate held for sale	27,000		94,700
Variable Rate Debt \| Fair Value \| Tax-exempt secured notes payable \| Fair Value, Measurements, Recurring
Debt instruments - fair value
Fair value	27,000
Variable Rate Debt \| Fair Value \| Level 3 \| Tax-exempt secured notes payable \| Fair Value, Measurements, Recurring
Debt instruments - fair value
Fair value	27,000		94,700
Tax-exempt secured notes payable \| Variable Rate Debt
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis
Secured debt including debt on real estate held for sale	27,000		94,700
Credit facilities
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis
Secured debt including debt on real estate held for sale		$ 205,000
Fannie Mae \| Fixed Rate Debt \| Carrying Amount \| Credit facilities \| Fair Value, Measurements, Recurring
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis
Secured debt including debt on real estate held for sale			90,000
Fannie Mae \| Fixed Rate Debt \| Fair Value \| Credit facilities \| Fair Value, Measurements, Recurring
Debt instruments - fair value
Fair value			90,213
Fannie Mae \| Fixed Rate Debt \| Fair Value \| Level 3 \| Credit facilities \| Fair Value, Measurements, Recurring
Debt instruments - fair value
Fair value			90,213
Mortgages Notes Payable \| Fixed Rate Debt
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis
Secured debt including debt on real estate held for sale	$ 884,869	$ 313,400	$ 417,989