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Unsecured Debt - Future Obligations (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Debt Instrument [Line Items]    
Total Debt $ 638,959 $ 643,550
Unsecured Debt    
Debt Instrument [Line Items]    
2022 0  
2023 300,000  
2024 400,000  
2025 500,000  
2026 450,000  
Thereafter 3,700,000  
Total Debt $ 5,350,000