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Debt Financing - Maturities of Debt (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Maturities    
2020 $ 295,789  
2021 1,948,697  
2022 2,730,561  
2023 2,502,123  
2024 1,544,791  
Thereafter 5,786,910  
Total $ 14,808,871 $ 13,721,295