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Indebtedness - Summary of Indebtedness at Estimated Fair Value (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Debt Instrument [Line Items] |  |
Mortgage Loans Payable, Net | $ 148,770 | $ 179,287
Senior Unsecured Notes, Net | 1,096,262 | 756,351
Unsecured Term Loans | 458,207 | 460,902
Unsecured Credit Facility | 0 | 158,141
Total | 1,703,239 | 1,554,681
Carrying Amount (A) |  |
Debt Instrument [Line Items] |  |
Mortgage Loans Payable, Net | 144,214 | 174,360
Senior Unsecured Notes, Net | 998,506 | 698,500
Unsecured Term Loans | 460,000 | 460,000
Unsecured Credit Facility | 0 | 158,000
Total | $ 1,602,720 | $ 1,490,860

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