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Debt (Maturities of Outstanding Debt) (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Debt Disclosure [Abstract]    
2021 $ 216,303  
2022 238,471  
2023 391,955  
2024 750,181  
2025 552,495  
Thereafter 460,841  
Total $ 2,610,246 $ 2,765,949