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Fair Value of Financial Instruments - Investment in Securities and Debt (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
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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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