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Debt - Summary of Debt Maturities (Details) - Scheduled Principal
$ in Thousands
Mar. 31, 2019
USD ($)
Debt Instrument [Line Items]  
2019 $ 446,164
2020 196,996
2021 658,853
2022 408,599
2023 529,139
Thereafter 1,168,690
Total debt $ 3,408,441