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Segment Data (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Mar. 01, 2018 | Dec. 31, 2017
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Affiliates |  | $ 53,080 |  | $ 39,824 | $ 114,724 |  | $ 76,443 |  |
Third party |  | 113,200 |  | 86,945 | 219,477 |  | 179,799 |  |
Total revenue |  | 166,280 |  | 126,769 | 334,201 |  | 256,242 |  |
Cost of Goods and Services Sold |  | 106,016 |  | 85,039 | 225,048 |  | 177,629 |  |
Operating costs and expenses: |  |  |  |  |  |  |  |  |
Operating expenses |  | 14,917 |  | 9,966 | 27,494 |  | 20,324 |  |
Segment contribution margin |  | 45,347 |  | 31,764 | 81,659 |  | 58,289 |  |
General and administrative expenses |  | 3,747 |  | 2,656 | 6,722 |  | 5,504 |  |
Depreciation and amortization |  | 7,019 |  | 5,742 | 13,019 |  | 10,935 |  |
Loss (gain) on asset disposals |  | (129) |  | (5) | (69) |  | 7 |  |
Operating income |  | 34,710 |  | 23,371 | 61,987 |  | 41,843 |  |
Capital spending (1) | [1] | 2,252 |  | 2,119 | 4,449 |  | 4,910 |  |
Total assets |  | 650,349 |  |  | 650,349 |  |  |  | $ 443,530
Pipelines and transportation |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Affiliates |  | 34,030 |  | 27,668 | 63,492 |  | 54,168 |  |
Third party |  | 3,714 |  | 2,555 | 7,965 |  | 4,732 |  |
Total revenue |  | 37,744 |  | 30,223 | 71,457 |  | 58,900 |  |
Cost of Goods and Services Sold |  | 5,195 |  | 4,403 | 9,636 |  | 8,808 |  |
Operating costs and expenses: |  |  |  |  |  |  |  |  |
Operating expenses |  | 9,933 |  | 7,933 | 19,555 |  | 16,088 |  |
Segment contribution margin |  | 22,616 |  | 17,887 | 42,266 |  | 34,004 |  |
Capital spending (1) |  | 826 | [1] | 1,660 | 2,234 | [1] | 3,797 |  |
Total assets |  | 439,311 |  |  | 439,311 |  |  |  | 349,351
Wholesale marketing and terminalling |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Affiliates | [2] | 19,050 |  | 12,156 | 51,232 |  | 22,275 |  |
Third party |  | 109,486 |  | 84,390 | 211,512 |  | 175,067 |  |
Total revenue |  | 128,536 |  | 96,546 | 262,744 |  | 197,342 |  |
Cost of Goods and Services Sold |  | 100,821 |  | 80,636 | 215,412 |  | 168,821 |  |
Operating costs and expenses: |  |  |  |  |  |  |  |  |
Operating expenses |  | 4,984 |  | 2,033 | 7,939 |  | 4,236 |  |
Segment contribution margin |  | 22,731 |  | 13,877 | 39,393 |  | 24,285 |  |
Capital spending (1) |  | 1,426 | [2] | $ 459 | 2,215 | [2] | $ 1,113 |  |
Total assets |  | $ 211,038 |  |  | $ 211,038 |  |  |  | $ 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 Logistic Assets Acquisition for the six months ended June 30, 2018. No costs were capitalized during the three months ended June 30, 2018.
[2] | Affiliate revenue for the wholesale marketing and terminalling segment is presented net of amortization expense pertaining to the Marketing Contract Intangible Acquisition. See Note 3 for additional information.

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