SEGMENT INFORMATION (Tables)
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12 Months Ended |
Dec. 31, 2019 |
| 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, | | 2019 |
| 2018 | | 2017 | | (Thousands of Dollars) | Revenues: | | | | | | Pipeline | $ | 701,830 |
| | $ | 611,065 |
| | $ | 516,288 |
| Storage: | | | | | | Third parties | 453,976 |
| | 443,546 |
| | 438,677 |
| Intersegment | 25 |
| | 42 |
| | 4,339 |
| Total storage | 454,001 |
| | 443,588 |
| | 443,016 |
| Fuels marketing | 342,215 |
| | 465,651 |
| | 489,807 |
| Consolidation and intersegment eliminations | (25 | ) | | (42 | ) | | (4,339 | ) | Total revenues | $ | 1,498,021 |
| | $ | 1,520,262 |
| | $ | 1,444,772 |
| | | | | | | Depreciation and amortization expense: | | | | | | Pipeline | $ | 166,991 |
| | $ | 153,943 |
| | $ | 128,061 |
| Storage | 97,573 |
| | 93,345 |
| | 91,696 |
| Total segment depreciation and amortization expense | 264,564 |
| | 247,288 |
| | 219,757 |
| Other depreciation and amortization expense | 8,360 |
| | 8,604 |
| | 8,435 |
| Total depreciation and amortization expense | $ | 272,924 |
| | $ | 255,892 |
| | $ | 228,192 |
| | | | | | | Operating income: | | | | | | Pipeline | $ | 332,480 |
| | $ | 272,695 |
| | $ | 231,795 |
| Storage | 154,105 |
| | 155,708 |
| | 172,720 |
| Fuels marketing | 20,578 |
| | 15,964 |
| | 1,987 |
| Consolidation and intersegment eliminations | (32 | ) | | 32 |
| | (1 | ) | Total segment operating income | 507,131 |
| | 444,399 |
| | 406,501 |
| General and administrative expenses | 107,855 |
| | 100,067 |
| | 107,556 |
| Other depreciation and amortization expense | 8,360 |
| | 8,604 |
| | 8,435 |
| Total operating income | $ | 390,916 |
| | $ | 335,728 |
| | $ | 290,510 |
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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, | | 2019 | | 2018 | | 2017 | | (Thousands of Dollars) | United States | $ | 1,465,135 |
| | $ | 1,481,844 |
| | $ | 1,406,776 |
| Foreign | 32,886 |
| | 38,418 |
| | 37,996 |
| Consolidated revenues | $ | 1,498,021 |
| | $ | 1,520,262 |
| | $ | 1,444,772 |
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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, | | 2019 | | 2018 | | (Thousands of Dollars) | United States | $ | 4,000,647 |
| | $ | 3,688,631 |
| Foreign | 118,332 |
| | 86,171 |
| Consolidated property, plant and equipment, net | $ | 4,118,979 |
| | $ | 3,774,802 |
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| Schedule of Segment Reporting Information Assets By Segment [Text Block] |
Total assets by reportable segment were as follows: | | | | | | | | | | December 31, | | 2019 | | 2018 | | (Thousands of Dollars) | Pipeline | $ | 3,884,819 |
| | $ | 3,637,226 |
| Storage | 2,082,832 |
| | 1,902,764 |
| Fuels marketing | 31,064 |
| | 37,252 |
| Total segment assets | 5,998,715 |
| | 5,577,242 |
| Assets held for sale | — |
| | 599,347 |
| Other partnership assets | 187,277 |
| | 172,551 |
| Total consolidated assets | $ | 6,185,992 |
| | $ | 6,349,140 |
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| Schedule of Capital Expenditures, by Segment [Table Text Block] |
Capital expenditures, including acquisitions, by reportable segment were as follows: | | | | | | | | | | | | | | Year Ended December 31, | | 2019 | | 2018 | | 2017 | | (Thousands of Dollars) | Pipeline | $ | 387,702 |
| | $ | 288,035 |
| | $ | 1,596,311 |
| Storage | 141,972 |
| | 202,782 |
| | 244,398 |
| Other partnership assets | 3,894 |
| | 4,137 |
| | 5,648 |
| Total capital expenditures | $ | 533,568 |
| | $ | 494,954 |
| | $ | 1,846,357 |
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