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Debt - Mortgage Maturities (Details) - Mortgages - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Debt Instrument [Line Items]    
2021 $ 0  
2022 22,834  
2023 40,097  
2024 15,700  
2025 28,630  
Thereafter 0  
Total $ 107,261 $ 176,051