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Equity Method Investments - Summarized Financial Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Red River |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Current Assets | $ 8,783 |  | $ 8,783 |  | $ 6,594
Non-current Assets | 375,416 |  | 375,416 |  | 375,618
Current liabilities | 3,319 |  | 3,319 |  | 4,945
Revenues | 14,391 | $ 10,112 | 26,017 | $ 19,190 |
Gross profit | 9,191 | 5,064 | 14,466 | 9,348 |
Net income | 8,942 | 4,628 | 13,652 | 8,513 |
Andeavor Logistics |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Current Assets | 23,031 |  | 23,031 |  | 15,450
Non-current Assets | 255,690 |  | 255,690 |  | 240,852
Current liabilities | 8,103 |  | 8,103 |  | 4,362
Non-current liabilities | 11 |  | 11 |  | $ 0
Revenues | 10,077 | 9,886 | 19,191 | 17,876 |
Gross profit | 5,688 | 5,245 | 10,584 | 8,479 |
Net income | $ 5,249 | $ 4,800 | $ 9,666 | $ 7,512 |

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