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Long-Term Obligations - Maturities of Long-term Debt (Details)
$ in Thousands
Dec. 31, 2020
USD ($)
DKL Credit Facility | Revolving Credit Facility | Fifth Third Bank | Line of Credit  
Debt Instrument [Line Items]  
2021 $ 0
2022 0
2023 746,600
2024 0
2025 0
Thereafter 0
Total 746,600
2025 Notes | Senior Notes  
Debt Instrument [Line Items]  
2021 0
2022 0
2023 0
2024 0
2025 250,000
Thereafter 0
Total $ 250,000