| Property, Plant and Equipment [Table Text Block] |
Property, plant and equipment, at cost, consisted of the following: | | | | | | | | | | | | | | Estimated Useful Lives | | December 31, | | | 2017 | | 2016 | | (Years) | | (Thousands of Dollars) | Land | | - | | | $ | 143,527 |
| | $ | 138,224 |
| Land and leasehold improvements | 5 | - | 40 | | 203,085 |
| | 187,930 |
| Buildings | 15 | - | 40 | | 151,702 |
| | 144,773 |
| Pipelines, storage and terminals | 20 | - | 40 | | 5,080,795 |
| | 4,647,718 |
| Rights-of-way | 20 | - | 40 | | 264,170 |
| | 202,311 |
| Construction in progress | | - | | | 400,202 |
| | 114,322 |
| Total | | | | | 6,243,481 |
| | 5,435,278 |
| Less accumulated depreciation and amortization | | | | | (1,942,548 | ) | | (1,712,995 | ) | Property, plant and equipment, net | | | | | $ | 4,300,933 |
| | $ | 3,722,283 |
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