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UNCONSOLIDATED AFFILIATES (Tables) | 9 Months Ended
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Sep. 30, 2018
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 from investments for the periods indicated:
| Three Months Ended |  | Nine Months Ended
| September 30, |  | September 30,
| 2018 |  | 2017 |  | 2018 |  | 2017
| (Thousands of dollars)
Northern Border Pipeline | $ | 16,486 |  |  | $ | 16,440 |  |  | $ | 48,863 |  |  | $ | 50,879 |
Overland Pass Pipeline Company | 16,081 |  |  | 15,793 |  |  | 48,714 |  |  | 44,243 |
Roadrunner Gas Transmission | 6,303 |  |  | 4,898 |  |  | 16,803 |  |  | 14,192 |
Other | 443 |  |  | 2,927 |  |  | 1,690 |  |  | 9,671 |
Equity in net earnings from investments | $ | 39,313 |  |  | $ | 40,058 |  |  | $ | 116,070 |  |  | $ | 118,985 |
Impairment of equity investments | $ | — |  |  | $ | (4,270 | ) |  | $ | — |  |  | $ | (4,270 | )
Unconsolidated Affiliates Financial Information |
Schedule of Equity Method Investments [Line Items] |
Schedule of Equity Method Investments [Table Text Block] | The following table sets forth summarized combined financial information of our unconsolidated affiliates for the periods indicated:
| Three Months Ended |  | Nine Months Ended
| September 30, |  | September 30,
| 2018 |  | 2017 |  | 2018 |  | 2017
| (Thousands of dollars)
Income Statement |  |  |  |  |  |  |
Operating revenues | $ | 160,962 |  |  | $ | 163,627 |  |  | $ | 471,641 |  |  | $ | 475,510 |
Operating expenses | $ | 69,004 |  |  | $ | 69,740 |  |  | $ | 205,525 |  |  | $ | 206,141 |
Net income | $ | 85,361 |  |  | $ | 87,330 |  |  | $ | 247,754 |  |  | $ | 260,533 |
Distributions paid to us | $ | 47,197 |  |  | $ | 49,414 |  |  | $ | 145,437 |  |  | $ | 146,094 |

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=66011266&loc=d3e33918-111571 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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