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Segment Data (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Affiliate | [1] |  |  |  |  |  |  |  |  | $ 156,280 | $ 149,564 | $ 152,564
Third party |  |  |  |  |  |  |  |  |  | 381,795 | 298,495 | 437,105
Total pipelines and transportation |  | $ 151,207 | $ 130,626 | $ 126,769 | $ 129,473 | $ 124,680 | $ 107,470 | $ 111,853 | $ 104,056 | 538,075 | 448,059 | 589,669
Operating costs and expenses: |  |  |  |  |  |  |  |  |  |  |  |
Cost of goods sold |  |  |  |  |  |  |  |  |  | 372,890 | 302,158 | 436,304
Operating expenses |  |  |  |  |  |  |  |  |  | 43,274 | 37,198 | 44,923
Segment contribution margin |  |  |  |  |  |  |  |  |  | 121,911 | 108,703 | 108,442
General and administrative expenses |  |  |  |  |  |  |  |  |  | 11,840 | 10,256 | 11,384
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 21,914 | 20,813 | 19,692
(Gain) loss on asset disposals |  |  |  |  |  |  |  |  |  | (20) | (16) | 104
Operating income |  | 23,698 | $ 22,636 | $ 23,371 | $ 18,472 | 19,163 | $ 17,001 | $ 22,512 | $ 18,974 | 88,177 | 77,650 | 77,262
Capital spending (excluding business combinations) |  |  |  |  |  |  |  |  |  | 18,403 | 11,767 | 22,427
Total assets |  | 443,530 |  |  |  | 415,547 |  |  |  | 443,530 | 415,547 |
Pipelines and Transportation |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Affiliate |  |  |  |  |  |  |  |  |  | 109,298 | 103,749 | 102,551
Third party |  |  |  |  |  |  |  |  |  | 12,431 | 18,423 | 28,828
Total pipelines and transportation |  |  |  |  |  |  |  |  |  | 121,729 | 122,172 | 131,379
Operating costs and expenses: |  |  |  |  |  |  |  |  |  |  |  |
Cost of goods sold |  |  |  |  |  |  |  |  |  | 18,210 | 19,425 | 19,607
Operating expenses |  |  |  |  |  |  |  |  |  | 33,240 | 29,235 | 33,751
Segment contribution margin |  |  |  |  |  |  |  |  |  | 70,279 | 73,512 | 78,021
Capital spending (excluding business combinations) |  |  |  |  |  |  |  |  |  | 14,262 | 8,478 | 16,030
Total assets |  | 349,351 |  |  |  | 337,349 |  |  |  | 349,351 | 337,349 |
Wholesale Marketing and Terminalling |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Affiliate |  |  |  |  |  |  |  |  |  | 46,982 | 45,815 | 50,013
Third party |  |  |  |  |  |  |  |  |  | 369,364 | 280,072 | 408,277
Total pipelines and transportation |  |  |  |  |  |  |  |  |  | 416,346 | 325,887 | 458,290
Operating costs and expenses: |  |  |  |  |  |  |  |  |  |  |  |
Cost of goods sold |  |  |  |  |  |  |  |  |  | 354,680 | 282,733 | 416,697
Operating expenses |  |  |  |  |  |  |  |  |  | 10,034 | 7,963 | 11,172
Segment contribution margin |  |  |  |  |  |  |  |  |  | 51,632 | 35,191 | 30,421
Capital spending (excluding business combinations) |  |  |  |  |  |  |  |  |  | 4,141 | 3,289 | $ 6,397
Total assets |  | $ 94,179 |  |  |  | $ 78,198 |  |  |  | $ 94,179 | $ 78,198 |
[1] | See Note 4 for a description of our material affiliate revenue transactions.

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