SEGMENT INFORMATION (Tables)
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12 Months Ended |
Dec. 31, 2020 |
| 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, | | | 2020 | | 2019 | | 2018 | | | (Thousands of Dollars) | | Revenues: | | | | | | | Pipeline | $ | 718,823 | | | $ | 701,830 | | | $ | 611,065 | | | | | | | | | Storage: | | | | | | | Third parties | 494,396 | | | 453,976 | | | 443,546 | | | Intersegment | 46 | | | 25 | | | 42 | | | Total storage | 494,442 | | | 454,001 | | | 443,588 | | | | | | | | | Fuels marketing | 268,345 | | | 342,215 | | | 465,651 | | | Consolidation and intersegment eliminations | (46) | | | (25) | | | (42) | | | Total revenues | $ | 1,481,564 | | | $ | 1,498,021 | | | $ | 1,520,262 | | | | | | | | | Depreciation and amortization expense: | | | | | | | Pipeline | $ | 177,384 | | | $ | 166,991 | | | $ | 153,943 | | | Storage | 99,092 | | | 97,573 | | | 93,345 | | | | | | | | | Total segment depreciation and amortization expense | 276,476 | | | 264,564 | | | 247,288 | | | Other depreciation and amortization expense | 8,625 | | | 8,360 | | | 8,604 | | | Total depreciation and amortization expense | $ | 285,101 | | | $ | 272,924 | | | $ | 255,892 | | | | | | | | | Operating income: | | | | | | | Pipeline | $ | 118,429 | | | $ | 332,480 | | | $ | 272,695 | | | Storage | 189,781 | | | 154,105 | | | 155,708 | | | Fuels marketing | 12,233 | | | 20,578 | | | 15,964 | | | Consolidation and intersegment eliminations | — | | | (32) | | | 32 | | | Total segment operating income | 320,443 | | | 507,131 | | | 444,399 | | | General and administrative expenses | 102,716 | | | 107,855 | | | 100,067 | | | Other depreciation and amortization expense | 8,625 | | | 8,360 | | | 8,604 | | | | | | | | | | | | | | | Total operating income | $ | 209,102 | | | $ | 390,916 | | | $ | 335,728 | |
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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, | | | 2020 | | 2019 | | 2018 | | | (Thousands of Dollars) | | United States | $ | 1,441,892 | | | $ | 1,465,135 | | | $ | 1,481,844 | | | Foreign | 39,672 | | | 32,886 | | | 38,418 | | | Consolidated revenues | $ | 1,481,564 | | | $ | 1,498,021 | | | $ | 1,520,262 | |
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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, | | | 2020 | | 2019 | | | (Thousands of Dollars) | | United States | $ | 3,837,550 | | | $ | 4,000,647 | | | Foreign | 119,962 | | | 118,332 | | | Consolidated property, plant and equipment, net | $ | 3,957,512 | | | $ | 4,118,979 | |
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| Schedule of Segment Reporting Information Assets By Segment [Text Block] |
Total assets by reportable segment were as follows: | | | | | | | | | | | | | | December 31, | | | 2020 | | 2019 | | | (Thousands of Dollars) | | Pipeline | $ | 3,609,508 | | | $ | 3,884,819 | | | Storage | 1,897,167 | | | 2,082,832 | | | Fuels marketing | 31,967 | | | 31,064 | | | Total segment assets | 5,538,642 | | | 5,998,715 | | | | | | | Other partnership assets | 278,376 | | | 187,277 | | | Total consolidated assets | $ | 5,817,018 | | | $ | 6,185,992 | |
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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, | | | 2020 | | 2019 | | 2018 | | | (Thousands of Dollars) | | Pipeline | $ | 122,512 | | | $ | 387,702 | | | $ | 288,035 | | | Storage | 71,788 | | | 141,972 | | | 202,782 | | | | | | | | | Other partnership assets | 3,779 | | | 3,894 | | | 4,137 | | | Total capital expenditures | $ | 198,079 | | | $ | 533,568 | | | $ | 494,954 | |
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