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Fair Value of Financial Instruments - Investment in Securities and Debt (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Non-real estate investments measured at fair value	$ 130,103	$ 135,115
Carrying Value | Unsecured debt
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Debt	2,225,000	1,925,000
Carrying Value | Secured debt
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Debt	1,718,973	1,507,276
Carrying Value | In-substance defeased debt
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Debt	129,105	131,707
Carrying Value | Joint venture partner debt
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Debt	66,136	66,136
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Non-real estate investments measured at fair value	135,205	140,270
Fair Value | Unsecured debt
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Debt	2,352,998	2,072,833
Fair Value | Secured debt
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Debt	1,592,605	1,503,960
Fair Value | In-substance defeased debt
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Debt	129,319	131,633
Fair Value | Joint venture partner debt
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Debt	$ 69,771	$ 68,346

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- Definition

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+ References

No definition available.

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- Definition

Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258

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- Definition

Fair value portion of notes payable.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19,20,22)
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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