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Fair Value - Classification Between the Three Levels of the Fair Value Hierarchy (Details) - Recurring basis - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
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Estimate of Fair Value Measurement |  |
Financial Instruments Measured/Discussed at Fair Value |  |
DownREIT units | $ (1,863) | $ (1,895)
Total | (7,869,314) | (8,563,805)
Fixed rate unsecured notes | Estimate of Fair Value Measurement |  |
Financial Instruments Measured/Discussed at Fair Value |  |
Indebtedness | (7,040,472) | (7,624,560)
Mortgage notes payable, variable rate unsecured notes and Term Loans | Estimate of Fair Value Measurement |  |
Financial Instruments Measured/Discussed at Fair Value |  |
Indebtedness | (841,293) | (940,779)
Interest Rate Caps | Not Designated as Hedging Instrument | Estimate of Fair Value Measurement |  |
Financial Instruments Measured/Discussed at Fair Value |  |
Derivative assets | 955 | 225
Interest Rate Swaps | Cash Flow Hedges | Estimate of Fair Value Measurement |  |
Financial Instruments Measured/Discussed at Fair Value |  |
Derivative assets | 13,359 | 3,204
Quoted Prices in Active Markets for Identical Asset (Level 1) |  |
Financial Instruments Measured/Discussed at Fair Value |  |
DownREIT units | (1,863) | (1,895)
Total | (7,042,335) | (7,626,455)
Quoted Prices in Active Markets for Identical Asset (Level 1) | Fixed rate unsecured notes |  |
Financial Instruments Measured/Discussed at Fair Value |  |
Indebtedness | (7,040,472) | (7,624,560)
Significant Other Observable Inputs (Level 2) |  |
Financial Instruments Measured/Discussed at Fair Value |  |
Total | (826,979) | (937,350)
Significant Other Observable Inputs (Level 2) | Mortgage notes payable, variable rate unsecured notes and Term Loans |  |
Financial Instruments Measured/Discussed at Fair Value |  |
Indebtedness | (841,293) | (940,779)
Significant Other Observable Inputs (Level 2) | Interest Rate Caps | Not Designated as Hedging Instrument |  |
Financial Instruments Measured/Discussed at Fair Value |  |
Derivative assets | 955 | 225
Significant Other Observable Inputs (Level 2) | Interest Rate Swaps | Cash Flow Hedges |  |
Financial Instruments Measured/Discussed at Fair Value |  |
Derivative assets | 13,359 | 3,204
Significant Unobservable Inputs (Level 3) |  |
Financial Instruments Measured/Discussed at Fair Value |  |
Total | $ 0 | $ 0

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- Definition Units of limited partnership interest in DownREITs which provide the DownREITs limited partners the ability to present all or some of their units for redemption for cash in the amount equal to the fair value of the company's common stock on or about the date of redemption. In lieu of cash redemption, the company may elect to exchange such units for an equal number of shares in the company's common stock. + References No definition available. + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226052-175313 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=123594938&loc=d3e13433-108611 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 + Details
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- Definition 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. + References No definition available. + Details
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- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
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