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Notes Payable and Unsecured Credit Facilities - Schedule of Maturities of Long-term Debt (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Debt Instrument [Line Items]    
2022 $ 17,237  
2023 74,071  
2024 345,591  
2025 293,732  
2026 291,922  
Beyond 5 Years 2,719,895  
Unamortized debt premium/(discount) and issuance costs (23,504)  
Total 3,718,944 $ 3,923,084
Unsecured Debt [Member]    
Debt Instrument [Line Items]    
Total 3,243,991 $ 3,239,609
Scheduled Principal Payments [Member] | Mortgages [Member]    
Debt Instrument [Line Items]    
2022 11,389  
2023 9,695  
2024 4,849  
2025 3,732  
2026 3,922  
Beyond 5 Years 6,661  
Total 40,248  
Mortgage Loan Maturities [Member] | Mortgages [Member]    
Debt Instrument [Line Items]    
2022 5,848  
2023 64,376  
2024 90,742  
2025 40,000  
2026 88,000  
Beyond 5 Years 138,234  
Unamortized debt premium/(discount) and issuance costs 7,505  
Total 434,705  
Unsecured Maturities [Member] | Unsecured Debt [Member]    
Debt Instrument [Line Items]    
2024 [1] 250,000  
2025 [1] 250,000  
2026 [1] 200,000  
Beyond 5 Years [1] 2,575,000  
Unamortized debt premium/(discount) and issuance costs [1] (31,009)  
Total [1] $ 3,243,991  
[1] Includes unsecured public and private debt and unsecured credit facilities