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Equity Method Investments - Summarized Financial Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Red River |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Current Assets | $ 11,618 |  | $ 11,618 |  | $ 6,594
Non-current Assets | 377,059 |  | 377,059 |  | 375,618
Current liabilities | 5,168 |  | 5,168 |  | 4,945
Revenues | 19,195 | $ 14,446 | 45,212 | $ 33,635 |
Gross profit | 14,469 | 9,110 | 28,935 | 18,457 |
Net income | 14,342 | 8,709 | 27,994 | 17,221 |
Andeavor Logistics |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Current Assets | 31,834 |  | 31,834 |  | 15,450
Non-current Assets | 260,427 |  | 260,427 |  | 240,852
Current liabilities | 8,060 |  | 8,060 |  | $ 4,362
Revenues | 14,602 | 8,384 | 33,793 | 26,260 |
Gross profit | 9,965 | 4,694 | 20,549 | 13,173 |
Net income | $ 9,458 | $ 4,055 | $ 19,124 | $ 11,567 |

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