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Segment Data (Details) - USD ($) $ in Thousands | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Mar. 01, 2018 | Dec. 31, 2017
Net Sales: |  |  |  |  |
Affiliate |  | $ 61,644 | $ 36,619 |  |
Third party |  | 106,277 | 92,854 |  |
Net revenues |  | 167,921 | 129,473 |  |
Operating costs and expenses: |  |  |  |  |
Cost of goods sold |  | 119,032 | 92,590 |  |
Operating expenses |  | 12,577 | 10,358 |  |
Segment contribution margin |  | 36,312 | 26,525 |  |
General and administrative expenses |  | 2,975 | 2,848 |  |
Depreciation and amortization |  | 6,000 | 5,193 |  |
Loss on asset disposals |  | 60 | 12 |  |
Operating income |  | 27,277 | 18,472 |  |
Capital spending (excluding business combinations) (1) | [1] | 2,197 | 2,791 |  |
Total assets |  | 665,946 |  |  | $ 443,530
Pipelines and transportation |  |  |  |  |
Net Sales: |  |  |  |  |
Affiliate |  | 29,462 | 26,500 |  |
Third party |  | 4,251 | 2,177 |  |
Net revenues |  | 33,713 | 28,677 |  |
Operating costs and expenses: |  |  |  |  |
Cost of goods sold |  | 4,441 | 4,405 |  |
Operating expenses |  | 9,622 | 8,155 |  |
Segment contribution margin |  | 19,650 | 16,117 |  |
Capital spending (excluding business combinations) (1) |  | 1,408 | 2,137 |  |
Total assets |  | 417,781 |  |  | 349,351
Wholesale marketing and terminalling |  |  |  |  |
Net Sales: |  |  |  |  |
Affiliate |  | 32,182 | 10,119 |  |
Third party |  | 102,026 | 90,677 |  |
Net revenues |  | 134,208 | 100,796 |  |
Operating costs and expenses: |  |  |  |  |
Cost of goods sold |  | 114,591 | 88,185 |  |
Operating expenses |  | 2,955 | 2,203 |  |
Segment contribution margin |  | 16,662 | 10,408 |  |
Capital spending (excluding business combinations) (1) |  | 789 | $ 654 |  |
Total assets |  | $ 248,165 |  |  | $ 94,179
Big Spring Pipeline |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Business Acquisition, Transaction Costs |  |  |  | $ 400 |
[1] | Capital spending excludes transaction costs capitalized in the amount of $0.4 million that relate to the Big Spring Assets Acquisition.

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