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Transactions with Related Parties (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Poseidon Oil Pipeline Company |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Due from related parties | $ 2,000 |  | $ 2,000 |  | $ 2,200
Related party transaction, revenues | 3,021 | $ 3,170 | 9,260 | $ 9,236 |
Related party transaction, costs and expenses | 247 | 254 | 746 | 744 |
ANSAC |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Due from related parties | 63,431 |  | 63,431 |  | $ 74,490
Related party transaction, revenues | 90,433 | 31,774 | 275,167 | 31,774 |
Related party transaction, costs and expenses | 1,393 | $ 454 | 4,427 | $ 454 |
Management Service | Poseidon Oil Pipeline Company |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Related party transaction, revenues | $ 2,200 |  | $ 6,500 |  |

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