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Long-Term Debt - Scheduled Maturities of Long-term Debt (Details)
$ in Thousands
Dec. 31, 2018
USD ($)
Debt Disclosure [Abstract]  
2019 $ 1,929,369
2020 80,016
2021 3,314,149
2022 1,291,472
2023 37,881
Thereafter $ 3,501,329