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Segment Data (Tables) | 12 Months Ended
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Dec. 31, 2016
Segment Reporting Information [Line Items] |
Schedule of Segment Reporting Information, by Segment [Table Text Block] | The following is a summary of business segment operating performance as measured by contribution margin for the period indicated (in thousands):
|  | Year Ended December 31,
|  | 2016 |  | 2015 |  | 2014
Pipelines and Transportation |  |  |  |  |  |
Net sales: |  |  |  |  |  |
Affiliate |  | 103,749 |  |  | $ | 102,551 |  |  | 80,683 |
Third party |  | 18,423 |  |  | 28,828 |  |  | 10,665 |
Total pipelines and transportation |  | 122,172 |  |  | 131,379 |  |  | 91,348 |
Operating costs and expenses: |  |  |  |  |  |
Cost of goods sold |  | 19,425 |  |  | 19,607 |  |  | 4,294 |
Operating expenses |  | 29,235 |  |  | 33,751 |  |  | 31,979 |
Segment contribution margin |  | $ | 73,512 |  |  | $ | 78,021 |  |  | $ | 55,075 |
Capital spending (excluding business combinations) |  | $ | 8,478 |  |  | $ | 16,030 |  |  | $ | 5,804 |
Wholesale Marketing and Terminalling |  |  |  |  |  |
Net sales: |  |  |  |  |  |
Affiliate |  | 45,815 |  |  | 50,013 |  |  | 33,900 |
Third party |  | 280,072 |  |  | 408,277 |  |  | 716,005 |
Total wholesale marketing and terminalling |  | 325,887 |  |  | 458,290 |  |  | 749,905 |
Operating costs and expenses: |  |  |  |  |  |
Cost of goods sold |  | 282,733 |  |  | 416,697 |  |  | 692,927 |
Operating expenses |  | 7,963 |  |  | 11,172 |  |  | 7,486 |
Segment contribution margin |  | $ | 35,191 |  |  | $ | 30,421 |  |  | $ | 49,492 |
Capital spending (excluding business combinations) |  | $ | 3,289 |  |  | $ | 6,397 |  |  | $ | 3,364 |
Consolidated |  |  |  |  |  |
Net sales: |  |  |  |  |  |
Affiliate |  | $ | 149,564 |  |  | $ | 152,564 |  |  | $ | 114,583 |
Third party |  | 298,495 |  |  | 437,105 |  |  | 726,670 |
Total Consolidated |  | 448,059 |  |  | 589,669 |  |  | 841,253 |
Operating costs and expenses: |  |  |  |  |  |
Cost of goods sold |  | 302,158 |  |  | 436,304 |  |  | 697,221 |
Operating expenses |  | 37,198 |  |  | 44,923 |  |  | 39,465 |
Contribution margin |  | 108,703 |  |  | 108,442 |  |  | 104,567 |
General and administrative expenses |  | 10,256 |  |  | 11,384 |  |  | 10,616 |
Depreciation and amortization |  | 20,813 |  |  | 19,692 |  |  | 15,022 |
(Gain) loss on asset disposals |  | (16 | ) |  | 104 |  |  | 83 |
Operating income |  | $ | 77,650 |  |  | $ | 77,262 |  |  | $ | 78,846 |
Capital spending (excluding business combinations) |  | $ | 11,767 |  |  | $ | 22,427 |  |  | $ | 9,168 |
The following table summarizes the total assets for each segment as of December 31, 2016 and 2015 (in thousands).
|  | Year Ended December 31,
|  | 2016 |  | 2015
Pipelines and transportation |  | $ | 337,349 |  |  | $ | 283,553 |
Wholesale marketing and terminalling |  | 78,198 |  |  | 91,735 |
Total Assets |  | $ | 415,547 |  |  | $ | 375,288 |

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- Definition Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e8906-108599 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e8813-108599 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e8721-108599 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e8736-108599 + Details
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