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Mortgage Notes, Lines of Credit and Bonds Payable - Aggregate Maturities and Fair Value (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Aggregate maturities of long-term debt    
2022 $ 112,000  
2024 2,100  
2025 27,087  
Thereafter 347,022  
Total 488,209  
Level 3 | Mortgage notes payable | Fair value    
Aggregate maturities of long-term debt    
Fair value of debt $ 497,700 $ 535,100