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Transactions with Related Parties (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018
Poseidon Oil Pipeline Company |  |  |
Related Party Transaction [Line Items] |  |  |
Due from related parties | $ 3,200 |  | $ 2,400
Related party transaction, revenues | 3,165 | $ 3,200 |
Related party transaction, costs and expenses | 247 | 249 |
ANSAC |  |  |
Related Party Transaction [Line Items] |  |  |
Due from related parties | 66,194 |  | $ 60,594
Related party transaction, revenues | 90,679 | 90,796 |
Related party transaction, costs and expenses | 1,057 | 1,778 |
Management Service | Poseidon Oil Pipeline Company |  |  |
Related Party Transaction [Line Items] |  |  |
Related party transaction, revenues | $ 2,200 | $ 2,200 |

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