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Long-term Debt - Debt Maturities (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Year ending December 31:    
2019 $ 62,140  
2020 63,114  
2021 81,474  
2022 99,919  
2023 655,069  
Thereafter 1,491,672  
Total minimum payments $ 2,453,388 $ 1,280,201