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Segment Data (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Affiliate | [1] |  |  |  |  |  |  |  |  | $ 240,809 | $ 156,280 | $ 149,564
Third party |  |  |  |  |  |  |  |  |  | 416,800 | 381,795 | 298,495
Net revenues |  | $ 159,298 | $ 164,110 | $ 166,280 | $ 167,921 | $ 151,207 | $ 130,626 | $ 126,769 | $ 129,473 | 657,609 | 538,075 | 448,059
Cost of materials and other |  |  |  |  |  |  |  |  |  | 429,061 | 372,890 | 302,158
Operating expenses (excluding depreciation and amortization) |  |  |  |  |  |  |  |  |  | 58,744 | 43,274 | 37,198
Segment contribution margin |  |  |  |  |  |  |  |  |  | 169,804 | 121,911 | 108,703
General and administrative expenses |  |  |  |  |  |  |  |  |  | 17,166 | 11,840 | 10,256
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 25,990 | 21,914 | 20,813
Loss (gain) on asset disposals |  |  |  |  |  |  |  |  |  | 891 | (20) | (16)
Operating income |  | 31,147 | $ 32,624 | $ 34,710 | $ 27,277 | 23,698 | $ 22,636 | $ 23,371 | $ 18,472 | 125,757 | 88,177 | 77,650
Capital spending | [2] |  |  |  |  |  |  |  |  | 11,565 | 18,403 | 11,767
Total assets |  | 624,593 |  |  |  | 443,530 |  |  |  | 624,593 | 443,530 |
Pipelines and Transportation |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Affiliate |  |  |  |  |  |  |  |  |  | 138,418 | 109,298 | 103,749
Third party |  |  |  |  |  |  |  |  |  | 15,149 | 12,431 | 18,423
Net revenues |  |  |  |  |  |  |  |  |  | 153,567 | 121,729 | 122,172
Cost of materials and other |  |  |  |  |  |  |  |  |  | 19,878 | 18,210 | 19,425
Operating expenses (excluding depreciation and amortization) |  |  |  |  |  |  |  |  |  | 39,934 | 33,240 | 29,235
Segment contribution margin |  |  |  |  |  |  |  |  |  | 93,755 | 70,279 | 73,512
Capital spending | [2] |  |  |  |  |  |  |  |  |  | 14,262 | 8,478
Total assets |  | 387,333 |  |  |  | 349,351 |  |  |  | 387,333 | 349,351 |
Wholesale Marketing and Terminalling |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Affiliate | [3] |  |  |  |  |  |  |  |  | 102,391 | 46,982 | 45,815
Third party |  |  |  |  |  |  |  |  |  | 401,651 | 369,364 | 280,072
Net revenues |  |  |  |  |  |  |  |  |  | 504,042 | 416,346 | 325,887
Cost of materials and other |  |  |  |  |  |  |  |  |  | 409,183 | 354,680 | 282,733
Operating expenses (excluding depreciation and amortization) |  |  |  |  |  |  |  |  |  | 18,810 | 10,034 | 7,963
Segment contribution margin |  |  |  |  |  |  |  |  |  | 76,049 | 51,632 | 35,191
Capital spending | [2] |  |  |  |  |  |  |  |  | 6,840 | 4,141 | $ 3,289
Total assets |  | 237,260 |  |  |  | $ 94,179 |  |  |  | 237,260 | $ 94,179 |
Big Spring Logistic Assets |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Capitalized acquisition costs |  | $ 400 |  |  |  |  |  |  |  | $ 400 |  |
[1] | See Note 4 for a description of our material affiliate revenue transactions.
[2] | Capital spending excludes transaction costs capitalized in the amount of $0.4 million that relate to the Big Spring Logistic Assets Acquisition for the year ended December 31, 2018.
[3] | 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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