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Transactions with Related Parties (Tables) | 12 Months Ended
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Dec. 31, 2017
Related Party Transactions [Abstract] |
Schedule of Transactions With Related Parties | ransactions with related parties were as follows:
| Year Ended December 31,
| 2017 |  | 2016 |  | 2015
Revenues: |  |  |  |  |
Sales of CO 2 to Sandhill Group, LLC (1) | $ | 2,820 |  |  | $ | 3,097 |  |  | $ | 3,259 |
Revenues from services and fees to Poseidon Oil Pipeline Company, LLC (2) | 12,357 |  |  | 10,844 |  |  | 4,536 |
Revenues from product sales to ANSAC | 124,536 |  |  | — |  |  | — |
Expenses: |  |  |  |  |
Amounts paid to our CEO in connection with the use of his aircraft | $ | 660 |  |  | $ | 660 |  |  | $ | 690 |
Charges for products purchased from Poseidon Oil Pipeline Company, LLC (2) | 986 |  |  | 1,007 |  |  | 464 |
Charges for services from ANSAC | 2,242 |  |  | — |  |  | — |
(1) | We own a 50% interest in Sandhill Group, LLC.
(2) | We own a 64% interest in Poseidon Oil Pipeline Company, LLC.
As of December 31, 2017, our receivables from and payables to ANSAC were:
| December 31
| 2017
Receivables: |
ANSAC | $ | 74,490 |
Payables: |
ANSAC | $ | 1,223 |
ANSAC is considered a variable interest entity (VIE) as we do experience certain risks and rewards from our relationship with them. As we do not exercise control over ANSAC and are not considered its primary beneficiary, we do not consolidate ANSAC.

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- Definition Tabular disclosure of related party transactions. Examples of related party transactions include, but are not limited to, transactions between (a) a parent company and its subsidiary; (b) subsidiaries of a common parent; (c) and entity and its principal owners and (d) affiliates. + References No definition available. + Details
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