| Schedule of Segment Reporting Information, by Segment [Text Block] |
Results of operations for the reportable segments were as follows: | | | | | | | | | | Three Months Ended March 31, | | 2012 | | 2011 | | (Thousands of Dollars) | Revenues: | | | | Storage: | | | | Third parties | $ | 127,687 |
| | $ | 125,253 |
| Intersegment | 17,045 |
| | 11,392 |
| Related party | 697 |
| | 130 |
| Total storage | 145,429 |
| | 136,775 |
| Transportation: | | | | Third parties | 77,761 |
| | 73,010 |
| Intersegment | — |
| | — |
| Total transportation | 77,761 |
| | 73,010 |
| Asphalt and fuels marketing: | | | | Third parties | 1,529,547 |
| | 1,036,223 |
| Intersegment | 129 |
| | 3,845 |
| Total asphalt and fuels marketing | 1,529,676 |
| | 1,040,068 |
| Consolidation and intersegment eliminations | (17,174 | ) | | (15,237 | ) | Total revenues | $ | 1,735,692 |
| | $ | 1,234,616 |
| | | | | Operating income: | | | | Storage | $ | 56,147 |
| | $ | 48,696 |
| Transportation | 36,951 |
| | 34,397 |
| Asphalt and fuels marketing | (15,775 | ) | | 118 |
| Consolidation and intersegment eliminations | (1 | ) | | 65 |
| Total segment operating income | 77,322 |
| | 83,276 |
| Less general and administrative expenses | 27,187 |
| | 25,983 |
| Less other depreciation and amortization expense | 1,814 |
| | 1,562 |
| Total operating income | $ | 48,321 |
| | $ | 55,731 |
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| Schedule of Segment Reporting Information Assets By Segment [Text Block] |
Total assets by reportable segment were as follows: | | | | | | | | | | March 31,
2012 | | December 31,
2011 | | (Thousands of Dollars) | Storage | $ | 2,622,491 |
| | $ | 2,597,904 |
| Transportation | 1,276,156 |
| | 1,251,474 |
| Asphalt and fuels marketing | 1,860,324 |
| | 1,717,960 |
| Total segment assets | 5,758,971 |
| | 5,567,338 |
| Other partnership assets | 324,457 |
| | 313,852 |
| Total consolidated assets | $ | 6,083,428 |
| | $ | 5,881,190 |
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