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Notes Payable - Maturities (Details) - Notes and bonds payable - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Maturity of notes and bonds payable    
2023 $ 750,000  
2024 350,000  
2025 500,000  
Thereafter 5,760,000  
Totals $ 7,360,000 $ 8,303,000