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Segment Data (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2016
Net Sales: |  |  |  |  |
Affiliate | $ 40,131 | $ 36,360 | $ 116,574 | $ 111,814 |
Third party | 90,495 | 71,110 | 270,294 | 211,565 |
Net sales | 130,626 | 107,470 | 386,868 | 323,379 |
Operating costs and expenses: |  |  |  |  |
Cost of goods sold | 89,120 | 73,527 | 266,749 | 213,381 |
Operating expenses | 10,662 | 9,251 | 30,986 | 28,445 |
Segment contribution margin | 30,844 | 24,692 | 89,133 | 81,553 |
General and administrative expenses | 2,751 | 2,307 | 8,255 | 7,918 |
Depreciation and amortization | 5,462 | 5,356 | 16,397 | 15,164 |
(Gain) loss on asset disposals | (5) | 28 | 2 | (16) |
Operating income | 22,636 | 17,001 | 64,479 | 58,487 |
Capital spending (excluding business combinations) | 3,786 | 3,077 | 8,696 | 5,009 |
Total assets | 422,858 |  | 422,858 |  | $ 415,547
Pipelines and Transportation [Member] |  |  |  |  |
Net Sales: |  |  |  |  |
Affiliate | 27,805 | 25,238 | 81,972 | 77,680 |
Third party | 3,177 | 3,388 | 7,910 | 15,739 |
Net sales | 30,982 | 28,626 | 89,882 | 93,419 |
Operating costs and expenses: |  |  |  |  |
Cost of goods sold | 4,883 | 4,811 | 13,691 | 14,401 |
Operating expenses | 8,573 | 7,678 | 24,661 | 22,317 |
Segment contribution margin | 17,526 | 16,137 | 51,530 | 56,701 |
Capital spending (excluding business combinations) | 2,918 | 2,613 | 6,715 | 4,037 |
Total assets | 344,260 |  | 344,260 |  | 337,349
Wholesale Marketing and Terminalling [Member] |  |  |  |  |
Net Sales: |  |  |  |  |
Affiliate | 12,326 | 11,122 | 34,602 | 34,134 |
Third party | 87,318 | 67,722 | 262,384 | 195,826 |
Net sales | 99,644 | 78,844 | 296,986 | 229,960 |
Operating costs and expenses: |  |  |  |  |
Cost of goods sold | 84,237 | 68,716 | 253,058 | 198,980 |
Operating expenses | 2,089 | 1,573 | 6,325 | 6,128 |
Segment contribution margin | 13,318 | 8,555 | 37,603 | 24,852 |
Capital spending (excluding business combinations) | 868 | $ 464 | 1,981 | $ 972 |
Total assets | $ 78,598 |  | $ 78,598 |  | $ 78,198

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