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Transactions With Related Parties (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016 | Dec. 31, 2016
Sandhill Group LLC |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Due from related parties | $ 200 |  | $ 200 |  | $ 200
Revenue from Related Parties |  |  | 1,403 | $ 1,488 |
Poseidon Oil Pipeline Company |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Due from related parties | 1,900 |  | 1,900 |  | $ 1,600
Revenue from Related Parties | 3,044 | $ 1,980 | 6,066 | $ 3,956 |
Management Fees Revenue | $ 2,100 |  | $ 4,200 |  |

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