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Fair Value (Details 4) - Recurring basis - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
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Estimate of Fair Value Measurement |  |
Financial Instruments Measured/Discussed at Fair Value |  |
DownREIT units | $ (1,359) | $ (1,338)
Total | (7,202,827) | (7,299,937)
Estimate of Fair Value Measurement | Unsecured notes |  |
Financial Instruments Measured/Discussed at Fair Value |  |
Indebtedness | (5,499,043) | (5,446,604)
Estimate of Fair Value Measurement | Secured Debt and Variable Rate Unsecured Indebtedness |  |
Financial Instruments Measured/Discussed at Fair Value |  |
Indebtedness | (1,699,182) | (1,849,851)
Estimate of Fair Value Measurement | Interest Rate Cap | Not Designated as Hedging Instrument |  |
Financial Instruments Measured/Discussed at Fair Value |  |
Derivative assets | 2 | 2
Estimate of Fair Value Measurement | Interest Rate Swap | Cash Flow Hedges |  |
Financial Instruments Measured/Discussed at Fair Value |  |
Derivative assets |  | 2,270
Derivative liability |  | (1,171)
Estimate of Fair Value Measurement | Put Option |  |
Financial Instruments Measured/Discussed at Fair Value |  |
Fair value of remaining outstanding Puts | (3,245) | (3,245)
Fair Value, Inputs, Level 1 |  |
Financial Instruments Measured/Discussed at Fair Value |  |
DownREIT units | (1,359) | (1,338)
Total | (5,500,402) | (5,447,942)
Fair Value, Inputs, Level 1 | Unsecured notes |  |
Financial Instruments Measured/Discussed at Fair Value |  |
Indebtedness | (5,499,043) | (5,446,604)
Fair Value, Inputs, Level 2 |  |
Financial Instruments Measured/Discussed at Fair Value |  |
Total | (1,699,180) | (1,848,750)
Fair Value, Inputs, Level 2 | Secured Debt and Variable Rate Unsecured Indebtedness |  |
Financial Instruments Measured/Discussed at Fair Value |  |
Indebtedness | (1,699,182) | (1,849,851)
Fair Value, Inputs, Level 2 | Interest Rate Cap | Not Designated as Hedging Instrument |  |
Financial Instruments Measured/Discussed at Fair Value |  |
Derivative assets | 2 | 2
Fair Value, Inputs, Level 2 | Interest Rate Swap | Cash Flow Hedges |  |
Financial Instruments Measured/Discussed at Fair Value |  |
Derivative assets |  | 2,270
Derivative liability |  | (1,171)
Fair Value, Inputs, Level 3 |  |
Financial Instruments Measured/Discussed at Fair Value |  |
Total | (3,245) | (3,245)
Fair Value, Inputs, Level 3 | Put Option |  |
Financial Instruments Measured/Discussed at Fair Value |  |
Fair value of remaining outstanding Puts | $ (3,245) | $ (3,245)

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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://fasb.org/us-gaap/role/ref/legacyRef -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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13433-108611 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -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 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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 Reference 2: 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=109250915&loc=d3e13433-108611 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -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 + 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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- Definition The aggregate fair value as of the reporting date 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section S99 -Paragraph 3A -Subparagraph 14 -URI http://asc.fasb.org/extlink&oid=65877616&loc=SL6540498-122764 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section S99 -Paragraph 3A -Subparagraph (16)(c) -URI http://asc.fasb.org/extlink&oid=65877616&loc=SL6540498-122764 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section S99 -Paragraph 3A -Subparagraph (12)(c) -URI http://asc.fasb.org/extlink&oid=65877616&loc=SL6540498-122764 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section S99 -Paragraph 3A -Subparagraph 15 -URI http://asc.fasb.org/extlink&oid=65877616&loc=SL6540498-122764 + Details
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