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Debt - Summary of Aggregate Payments of Principal on All Debt (Details)
$ in Thousands
Dec. 31, 2017
USD ($)
Debt Disclosure [Abstract]  
2018 $ 446,969
2019 975,334
2020 1,678,992
2021 927,806
2022 265,741
Thereafter 4,776,232
Subtotal 9,071,074
Deferred Financing Costs and Unamortized (Discount) (113,783)
Total $ 8,957,291