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UNCONSOLIDATED AFFILIATES (Tables) | 6 Months Ended
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Jun. 30, 2020
Equity In Net Earnings From Investments |
Schedule of Equity Method Investments [Line Items] |
Schedule of Equity Method Investments [Table Text Block] | The following table sets forth our equity in net earnings (loss) from investments for the periods indicated:
| Three Months Ended |  | Six Months Ended
| June 30, |  | June 30,
| 2020 |  | 2019 |  | 2020 |  | 2019
| (Thousands of dollars)
Northern Border Pipeline | $ | 12,871 |  |  | $ | 13,689 |  |  | $ | 34,991 |  |  | $ | 34,491 |
Overland Pass Pipeline | 7,972 |  |  | 15,465 |  |  | 22,083 |  |  | 32,859 |
Roadrunner | 6,809 |  |  | 6,077 |  |  | 13,242 |  |  | 12,415 |
Other | (2,324 | ) |  | (1,113 | ) |  | (361 | ) |  | (2,166 | )
Equity in net earnings from investments | $ | 25,328 |  |  | $ | 34,118 |  |  | $ | 69,955 |  |  | $ | 77,599 |
Impairment of equity investments | $ | — |  |  | $ | — |  |  | $ | (37,730 | ) |  | $ | — |

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- Definition Tabular disclosure of equity method investments including, but not limited to, name of each investee or group of investments, percentage ownership, difference between recorded amount of an investment and the value of the underlying equity in the net assets, and summarized financial information. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571 + Details
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