SEGMENT INFORMATION (Tables)
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12 Months Ended |
Dec. 31, 2017 |
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| Segment Reporting [Abstract] |
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| Schedule of Segment Reporting Information, by Segment [Text Block] |
Results of operations for the reportable segments were as follows: | | | | | | | | | | | | | | Year Ended December 31, | | 2017 |
| 2016 | | 2015 | | (Thousands of Dollars) | Revenues: | | | | | | Pipeline | $ | 516,288 |
| | $ | 485,650 |
| | $ | 508,522 |
| Storage: | | | | | | Third parties | 604,847 |
| | 589,098 |
| | 599,302 |
| Intersegment | 12,106 |
| | 20,944 |
| | 25,606 |
| Total storage | 616,953 |
| | 610,042 |
| | 624,908 |
| Fuels marketing | 692,884 |
| | 681,934 |
| | 976,216 |
| Consolidation and intersegment eliminations | (12,106 | ) | | (20,944 | ) | | (25,606 | ) | Total revenues | $ | 1,814,019 |
| | $ | 1,756,682 |
| | $ | 2,084,040 |
| | | | | | | Depreciation and amortization expense: | | | | | | Pipeline | $ | 128,061 |
| | $ | 89,554 |
| | $ | 84,951 |
| Storage | 127,473 |
| | 118,663 |
| | 116,768 |
| Total segment depreciation and amortization expense | 255,534 |
| | 208,217 |
| | 201,719 |
| Other depreciation and amortization expense | 8,698 |
| | 8,519 |
| | 8,491 |
| Total depreciation and amortization expense | $ | 264,232 |
| | $ | 216,736 |
| | $ | 210,210 |
| | | | | | | Operating income: | | | | | | Pipeline | $ | 231,795 |
| | $ | 248,238 |
| | $ | 270,349 |
| Storage | 219,439 |
| | 214,801 |
| | 217,818 |
| Fuels marketing | 5,983 |
| | 3,406 |
| | 13,507 |
| Consolidation and intersegment eliminations | (1 | ) | | — |
| | 42 |
| Total segment operating income | 457,216 |
| | 466,445 |
| | 501,716 |
| General and administrative expenses | 112,240 |
| | 98,817 |
| | 102,521 |
| Other depreciation and amortization expense | 8,698 |
| | 8,519 |
| | 8,491 |
| Total operating income | $ | 336,278 |
| | $ | 359,109 |
| | $ | 390,704 |
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| 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, | | 2017 | | 2016 | | 2015 | | (Thousands of Dollars) | United States | $ | 1,406,626 |
| | $ | 1,352,936 |
| | $ | 1,599,088 |
| Netherlands | 322,251 |
| | 313,395 |
| | 386,282 |
| Other | 85,142 |
| | 90,351 |
| | 98,670 |
| Consolidated revenues | $ | 1,814,019 |
| | $ | 1,756,682 |
| | $ | 2,084,040 |
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| 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, | | 2017 | | 2016 | | (Thousands of Dollars) | United States | $ | 3,519,965 |
| | $ | 3,086,337 |
| Netherlands | 572,817 |
| | 469,061 |
| Other | 208,151 |
| | 166,885 |
| Consolidated long-lived assets | $ | 4,300,933 |
| | $ | 3,722,283 |
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| Schedule of Segment Reporting Information Assets By Segment [Text Block] |
Total assets by reportable segment were as follows: | | | | | | | | | | December 31, | | 2017 | | 2016 | | (Thousands of Dollars) | Pipeline | $ | 3,492,417 |
| | $ | 2,024,633 |
| Storage | 2,735,563 |
| | 2,522,586 |
| Fuels marketing | 118,746 |
| | 168,347 |
| Total segment assets | 6,346,726 |
| | 4,715,566 |
| Other partnership assets | 188,507 |
| | 314,979 |
| Total consolidated assets | $ | 6,535,233 |
| | $ | 5,030,545 |
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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, | | 2017 | | 2016 | | 2015 | | (Thousands of Dollars) | Pipeline | $ | 1,596,311 |
| | $ | 88,373 |
| | $ | 175,657 |
| Storage | 244,398 |
| | 206,641 |
| | 285,258 |
| Other partnership assets | 5,648 |
| | 5,001 |
| | 9,957 |
| Total capital expenditures | $ | 1,846,357 |
| | $ | 300,015 |
| | $ | 470,872 |
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