Derivative, Notional Amounts Entered into During Period

No definition available.

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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

Amount of net assets (liabilities).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 225
-Section S99
-Paragraph 3
-Subparagraph (SX 210.6-09.6,7)
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-Section 50
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-Name Accounting Standards Codification
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-Subparagraph (SX 210.6-05.4)
-URI http://asc.fasb.org/extlink&oid=6488278&loc=d3e604008-122996

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 09
-Paragraph 19
-Article 6

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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/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (c)
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-Publisher FASB
-Name Accounting Standards Codification
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-Name Accounting Standards Codification
-Topic 825
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-Topic 825
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-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 55
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=51825145&loc=SL20226008-175313

+ Details

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Period Type:	instant

- Definition

The effective portion of loss reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624171-113959

+ Details

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Period Type:	duration

- 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

Amount after tax and reclassification adjustments, of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss), attributable to parent entity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 45
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=51664549&loc=SL4569643-111683

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-Publisher FASB
-Name Accounting Standards Codification
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (c)(3)
-URI http://asc.fasb.org/extlink&oid=18733093&loc=SL4573702-111684

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- Definition

Amount after tax of reclassification adjustment from accumulated other comprehensive income of accumulated gain (loss) realized from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's deferred hedging gain (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
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-Paragraph 15
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e637-108580

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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://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 480
-SubTopic 10
-Section S99
-Paragraph 3A
-Subparagraph 14
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-Name Accounting Standards Codification
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-Subparagraph 15
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 480
-SubTopic 10
-Section S99
-Paragraph 3A
-Subparagraph (16)(c)
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 480
-SubTopic 10
-Section S99
-Paragraph 3A
-Subparagraph (12)(c)
-URI http://asc.fasb.org/extlink&oid=27011957&loc=SL6540498-122764

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Fair Value (Details 2) - USD ($) $ in Thousands	3 Months Ended
Fair Value (Details 2) - USD ($) $ in Thousands	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Financial Instruments Measured/Discussed at Fair Value
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax, Portion Attributable to Parent	$ (47,757)	$ (30)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax	(1,374)	(1,595)
Derivative Instruments, Loss Reclassified from Accumulated OCI into Income, Effective Portion	1,374	$ 1,565
Recurring basis \| Fair Value, Inputs, Level 1 [Member]
Financial Instruments Measured/Discussed at Fair Value
DownREIT units	(1,427)		$ (1,381)
Total	(3,719,413)		(3,669,798)
Recurring basis \| Fair Value, Inputs, Level 2 [Member]
Financial Instruments Measured/Discussed at Fair Value
Total	(2,800,230)		(2,694,888)
Recurring basis \| Fair Value, Inputs, Level 3 [Member]
Financial Instruments Measured/Discussed at Fair Value
Total	(8,265)		(8,181)
Recurring basis \| Fair Value, Inputs, Level 3 [Member] \| Puts
Financial Instruments Measured/Discussed at Fair Value
Fair value of remaining outstanding Puts	(8,265)		(8,181)
Cash Flow Hedges \| Interest Rate Swap [Member]
Financial Instruments Measured/Discussed at Fair Value
Notional amounts entered into during period	450,000
Cash Flow Hedges \| Recurring basis \| Fair Value, Inputs, Level 2 [Member] \| Interest Rate Cap [Member]
Financial Instruments Measured/Discussed at Fair Value
Derivative assets	1		5
Unsecured notes \| Recurring basis \| Fair Value, Inputs, Level 1 [Member]
Financial Instruments Measured/Discussed at Fair Value
Indebtedness	(3,717,986)		(3,668,417)
Secured Debt and Variable Rate Unsecured Term Loan [Member] \| Recurring basis \| Fair Value, Inputs, Level 2 [Member]
Financial Instruments Measured/Discussed at Fair Value
Indebtedness	(2,757,911)		(2,700,341)
Not Designated as Hedging Instrument [Member] \| Recurring basis \| Fair Value, Inputs, Level 2 [Member] \| Interest Rate Cap [Member]
Financial Instruments Measured/Discussed at Fair Value
Derivative assets	64		26
Estimate of Fair Value Measurement [Member] \| Recurring basis
Financial Instruments Measured/Discussed at Fair Value
DownREIT units	(1,427)		(1,381)
Total	(6,527,908)		(6,372,867)
Estimate of Fair Value Measurement [Member] \| Recurring basis \| Puts
Financial Instruments Measured/Discussed at Fair Value
Fair value of remaining outstanding Puts	(8,265)		(8,181)
Estimate of Fair Value Measurement [Member] \| Cash Flow Hedges \| Recurring basis \| Interest Rate Cap [Member]
Financial Instruments Measured/Discussed at Fair Value
Derivative assets	1		5
Estimate of Fair Value Measurement [Member] \| Cash Flow Hedges \| Recurring basis \| Interest Rate Swap [Member]
Financial Instruments Measured/Discussed at Fair Value
Derivative assets	(42,384)		5,422
Estimate of Fair Value Measurement [Member] \| Unsecured notes \| Recurring basis
Financial Instruments Measured/Discussed at Fair Value
Indebtedness	(3,717,986)		3,668,417
Estimate of Fair Value Measurement [Member] \| Secured Debt and Variable Rate Unsecured Term Loan [Member] \| Recurring basis
Financial Instruments Measured/Discussed at Fair Value
Indebtedness	(2,757,911)		(2,700,341)
Estimate of Fair Value Measurement [Member] \| Not Designated as Hedging Instrument [Member] \| Recurring basis \| Interest Rate Cap [Member]
Financial Instruments Measured/Discussed at Fair Value
Derivative assets	$ 64		$ 26