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Debt - Maturities of Debt (Details)
$ in Thousands
Dec. 31, 2017
USD ($)
Debt Maturities [Abstract]  
2018 $ 92,807
2019 43,528
2020 61,663
2021 96,184
2022 1,224,536
Thereafter 2,908,704
Debt $ 4,427,422