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Long-Term Obligations Maturities of Long-term Debt (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Jun. 30, 2018
DKL Credit Facility | Revolving Credit Facility | Fifth Third Bank | Line of Credit    
Debt Instrument [Line Items]    
2019   $ 0
2020   0
2021   0
2022   0
2023   456,700
Thereafter   0
Total $ 456,700 456,700
2025 Notes | Senior Notes    
Debt Instrument [Line Items]    
2019   0
2020   0
2021   0
2022   0
2023   0
Thereafter   250,000
Total $ 250,000 $ 250,000