| Segment Reporting [Abstract] | Period [Axis] |
|---|
2016-01-01 - 2016-12-31 |
|---|
Segment Reporting [Abstract] | |
Schedule of Segment Reporting Information, by Segment [Text Block] | Results of operations for the reportable segments were as follows: | | | | | | | | | | | | | | Year Ended December 31, | | 2016 |
| 2015 | | 2014 | | (Thousands of Dollars) | Revenues: | | | | | | Pipeline | $ | 485,650 |
| | $ | 508,522 |
| | $ | 477,030 |
| Storage: | | | | | | Third parties | 589,098 |
| | 599,302 |
| | 537,142 |
| Intersegment | 20,944 |
| | 25,606 |
| | 26,435 |
| Related party | — |
| | — |
| | 929 |
| Total storage | 610,042 |
| | 624,908 |
| | 564,506 |
| Fuels marketing | 681,934 |
| | 976,216 |
| | 2,060,017 |
| Consolidation and intersegment eliminations | (20,944 | ) | | (25,606 | ) | | (26,435 | ) | Total revenues | $ | 1,756,682 |
| | $ | 2,084,040 |
| | $ | 3,075,118 |
| | | | | | | Depreciation and amortization expense: | | | | | | Pipeline | $ | 89,554 |
| | $ | 84,951 |
| | $ | 77,691 |
| Storage | 118,663 |
| | 116,768 |
| | 103,848 |
| Fuels marketing | — |
| | — |
| | 16 |
| Total segment depreciation and amortization expense | 208,217 |
| | 201,719 |
| | 181,555 |
| Other depreciation and amortization expense | 8,519 |
| | 8,491 |
| | 10,153 |
| Total depreciation and amortization expense | $ | 216,736 |
| | $ | 210,210 |
| | $ | 191,708 |
| | | | | | | Operating income: | | | | | | Pipeline | $ | 248,238 |
| | $ | 270,349 |
| | $ | 245,233 |
| Storage | 214,801 |
| | 217,818 |
| | 183,104 |
| Fuels marketing | 3,406 |
| | 13,507 |
| | 24,805 |
| Consolidation and intersegment eliminations | — |
| | 42 |
| | (32 | ) | Total segment operating income | 466,445 |
| | 501,716 |
| | 453,110 |
| General and administrative expenses | 98,817 |
| | 102,521 |
| | 96,056 |
| Other depreciation and amortization expense | 8,519 |
| | 8,491 |
| | 10,153 |
| Total operating income | $ | 359,109 |
| | $ | 390,704 |
| | $ | 346,901 |
|
|
Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area [Table Text Block] | Revenues by geographic area are shown in the table below. | | | | | | | | | | | | | | Year Ended December 31, | | 2016 | | 2015 | | 2014 | | (Thousands of Dollars) | United States | $ | 1,352,936 |
| | $ | 1,599,088 |
| | $ | 2,276,609 |
| Netherlands | 313,395 |
| | 386,282 |
| | 705,207 |
| Other | 90,351 |
| | 98,670 |
| | 93,302 |
| Consolidated revenues | $ | 1,756,682 |
| | $ | 2,084,040 |
| | $ | 3,075,118 |
|
|
Schedule of Disclosure on Geographic Areas, Long-Lived Assets in Individual Foreign Countries by Country [Table Text Block] | Total amounts of property, plant and equipment, net by geographic area were as follows: | | | | | | | | | | December 31, | | 2016 | | 2015 | | (Thousands of Dollars) | United States | $ | 3,086,337 |
| | $ | 3,049,334 |
| Netherlands | 469,061 |
| | 449,406 |
| Other | 166,885 |
| | 184,831 |
| Consolidated long-lived assets | $ | 3,722,283 |
| | $ | 3,683,571 |
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Schedule of Segment Reporting Information Assets By Segment [Text Block] | Total assets by reportable segment were as follows: | | | | | | | | | | December 31, | | 2016 | | 2015 | | (Thousands of Dollars) | Pipeline | $ | 2,024,633 |
| | $ | 2,014,098 |
| Storage | 2,522,586 |
| | 2,476,389 |
| Fuels marketing | 168,347 |
| | 156,866 |
| Total segment assets | 4,715,566 |
| | 4,647,353 |
| Other partnership assets | 314,979 |
| | 478,172 |
| Total consolidated assets | $ | 5,030,545 |
| | $ | 5,125,525 |
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|
Schedule of Capital Expenditures, by Segment [Table Text Block] | Capital expenditures, including acquisitions and investments in other noncurrent assets, by reportable segment were as follows: | | | | | | | | | | | | | | Year Ended December 31, | | 2016 | | 2015 | | 2014 | | (Thousands of Dollars) | Pipeline | $ | 88,373 |
| | $ | 175,657 |
| | $ | 244,713 |
| Storage | 206,641 |
| | 285,258 |
| | 108,457 |
| Other partnership assets | 5,001 |
| | 9,957 |
| | 3,795 |
| Total capital expenditures | $ | 300,015 |
| | $ | 470,872 |
| | $ | 356,965 |
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