| Schedule of Segment Reporting Information, by Segment [Table Text Block] |
Results of operations for the reportable segments were as follows: | | | | | | | | | | Three Months Ended March 31, | | 2014 | | 2013 | | (Thousands of Dollars) | Revenues: | | | | Pipeline | $ | 102,959 |
| | $ | 93,277 |
| Storage: | | | | Third parties | 124,354 |
| | 130,660 |
| Intersegment | 7,283 |
| | 9,776 |
| Related party | 929 |
| | 1,241 |
| Total storage | 132,566 |
| | 141,677 |
| Fuels marketing | 620,971 |
| | 773,008 |
| Consolidation and intersegment eliminations | (7,283 | ) | | (9,776 | ) | Total revenues | $ | 849,213 |
| | $ | 998,186 |
| | | | | Operating income: | | | | Pipeline | $ | 52,990 |
| | $ | 39,881 |
| Storage | 42,007 |
| | 53,956 |
| Fuels marketing | 9,558 |
| | (1,593 | ) | Consolidation and intersegment eliminations | (17 | ) | | 1,106 |
| Total segment operating income | 104,538 |
| | 93,350 |
| General and administrative expenses | 20,856 |
| | 27,494 |
| Other depreciation and amortization expense | 2,579 |
| | 2,498 |
| Total operating income | $ | 81,103 |
| | $ | 63,358 |
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| Reconciliation of Assets from Segment to Consolidated [Table Text Block] |
Total assets by reportable segment were as follows: | | | | | | | | | | March 31,
2014 | | December 31,
2013 | | (Thousands of Dollars) | Pipeline | $ | 1,805,749 |
| | $ | 1,797,698 |
| Storage | 2,265,530 |
| | 2,275,183 |
| Fuels marketing | 385,421 |
| | 445,882 |
| Total segment assets | 4,456,700 |
| | 4,518,763 |
| Other partnership assets | 457,934 |
| | 513,423 |
| Total consolidated assets | $ | 4,914,634 |
| | $ | 5,032,186 |
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