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Mortgage and Other Indebtedness - Consolidated Indebtedness by Type of Debt (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Participating Mortgage Loans [Line Items] |  |
Principal | $ 1,298,980 | $ 1,176,076
Unamortized Net Premiums | 1,400 | 1,732
Unamortized Debt Issuance Costs | (11,386) | (7,014)
Total | 1,288,994 | 1,170,794
Unsecured revolving credit facility |  |
Participating Mortgage Loans [Line Items] |  |
Principal | 0 | 25,000
Unamortized Net Premiums | 0 | 0
Unamortized Debt Issuance Costs | (1,253) | (1,672)
Total |  | 23,328
Senior unsecured notes—fixed rate | Fixed rate debt |  |
Participating Mortgage Loans [Line Items] |  |
Principal | 550,000 | 550,000
Unamortized Net Premiums | 0 | 0
Unamortized Debt Issuance Costs | (3,556) | (3,595)
Total | 546,444 | 546,405
Unsecured term loan |  |
Participating Mortgage Loans [Line Items] |  |
Principal | 250,000 | 250,000
Unamortized Net Premiums | 0 | 0
Unamortized Debt Issuance Costs | (1,488) | (1,647)
Total | 248,512 | 248,353
Exchangeable senior notes - fixed rate | Fixed rate debt |  |
Participating Mortgage Loans [Line Items] |  |
Principal | 175,000 |
Unamortized Net Premiums | 0 |
Unamortized Debt Issuance Costs | (5,052) |
Total | 169,948 |
Mortgages notes payable | Fixed rate debt |  |
Participating Mortgage Loans [Line Items] |  |
Principal | 294,787 | 295,966
Unamortized Net Premiums | 1,400 | 1,732
Unamortized Debt Issuance Costs | (14) | (25)
Total | 296,173 | 297,673
Mortgages notes payable | Variable rate debt |  |
Participating Mortgage Loans [Line Items] |  |
Principal | 29,193 | 55,110
Unamortized Net Premiums | 0 | 0
Unamortized Debt Issuance Costs | (23) | (75)
Total | $ 29,170 | $ 55,035

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