Indebtedness Unsecured Debt (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2021	Jan. 31, 2021
Debt Instrument [Line Items]
Debt Instrument, Face Amount		$ 450,000
Debt Instrument, Interest Rate, Stated Percentage		1.75%
Debt Instrument, Interest Rate, Effective Percentage		1.83%
Non-cash distribution of properties from Unconsolidated Joint Ventues
Debt Instrument [Line Items]
Repayments of Assumed Debt	$ 40,200
Unsecured Debt [Member]
Debt Instrument [Line Items]
Debt Instrument, Estimated Trading Values, Percent of Face Value, Minimum	92.00%
Debt Instrument, Estimated Trading Values, Percent of Face Value, Maximum	127.00%
Debt Instrument, Covenant Compliance	We were in compliance with all such financial covenants at

Debt Instrument, Estimated Trading Values, Percent of Face Value, Maximum

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- Definition

Debt Instrument, Estimated Trading Values, Percent of Face Value, Minimum

+ References

No definition available.

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- Definition

States whether the entity was in compliance with the debt covenants throughout the reporting period, and describes facts and circumstances of any compliance failure.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
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- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 6
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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

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-Publisher FASB
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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.

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- Definition

The cash outflow from the repayments of a long-term debt originally issued by another party but is assumed by the entity.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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