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Indebtedness - Schedule of Secured and Other Debt (Details) $ in Thousands | Dec. 31, 2021 USD ($) property | Dec. 31, 2020 USD ($)
--- | --- | ---
Debt Instrument |  |
Principal Balance | $ 69,713 | $ 691,573
Net book value of collateral | 5,075,749 | 5,715,829
Unamortized discount (premium) and debt issuance costs, net | 3,676,524 |
Secured Debt |  |
Debt Instrument |  |
Principal Balance | $ 69,135 | 692,294
Number of Properties as Collateral | property | 8 |
Net book value of collateral | $ 118,342 | 822,153
Secured Debt | Mortgage notes 6.28% maturing July 2022 |  |
Debt Instrument |  |
Principal Balance | $ 11,120 | 11,838
Interest rate (as a percent) | 6.28% |
Number of Properties as Collateral | property | 1 |
Net book value of collateral | $ 23,525 | 23,500
Secured Debt | Mortgage notes 4.85% maturing October 2022 |  |
Debt Instrument |  |
Principal Balance | $ 10,479 | 10,724
Interest rate (as a percent) | 4.85% |
Number of Properties as Collateral | property | 1 |
Net book value of collateral | $ 19,211 | 19,675
Secured Debt | Mortgage notes 5.75% maturing October 2022 |  |
Debt Instrument |  |
Principal Balance | $ 15,456 | 15,805
Interest rate (as a percent) | 5.75% |
Number of Properties as Collateral | property | 2 |
Net book value of collateral | $ 19,099 | 19,180
Secured Debt | Mortgage notes 6.64% maturing June 2023 |  |
Debt Instrument |  |
Principal Balance | $ 15,204 | 15,646
Interest rate (as a percent) | 6.64% |
Number of Properties as Collateral | property | 1 |
Net book value of collateral | $ 24,593 | 23,023
Secured Debt | Mortgage notes 3.53% maturing in August 2026 |  |
Debt Instrument |  |
Principal Balance | $ 0 | 620,000
Interest rate (as a percent) | 3.53% |
Number of Properties as Collateral | property | 0 |
Net book value of collateral | $ 0 | 705,096
Secured Debt | Mortgage notes 4.44% maturing July 2043 |  |
Debt Instrument |  |
Principal Balance | $ 10,240 | 10,470
Interest rate (as a percent) | 4.44% |
Number of Properties as Collateral | property | 1 |
Net book value of collateral | $ 13,387 | 13,582
Secured Debt | Capital leases 7.70% maturing in April 2026 |  |
Debt Instrument |  |
Principal Balance | $ 6,636 | 7,811
Interest rate (as a percent) | 7.70% |
Number of Properties as Collateral | property | 2 |
Net book value of collateral | $ 18,527 | 18,097
Secured Debt | Mortgage notes 7.49% maturing in January 2022 |  |
Debt Instrument |  |
Unamortized discount (premium) and debt issuance costs, net | $ (578) | $ 721
Joint Venture | Secured Debt | Mortgage notes 3.53% maturing in August 2026 |  |
Debt Instrument |  |
Ownership interest by parent | 20.00% |

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