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Indebtedness - Summary of Indebtedness at Estimated Fair Value (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Debt Instrument [Line Items] |  |  |
Mortgage Loans Payable, Net |  | $ 146,770 | $ 148,770
Senior Unsecured Notes, Net |  | 1,069,826 | 1,096,262
Unsecured Term Loans |  | 460,946 | 458,207
Total |  | 1,677,542 | 1,703,239
Carrying Amount (A) |  |  |
Debt Instrument [Line Items] |  |  |
Mortgage Loans Payable, Net | [1] | 142,941 | 144,214
Senior Unsecured Notes, Net | [1] | 998,508 | 998,506
Unsecured Term Loans | [1] | 460,000 | 460,000
Total | [1] | $ 1,601,449 | $ 1,602,720
[1] | The carrying amounts include unamortized premiums and discounts and exclude unamortized debt issuance costs.

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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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