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UNCONSOLIDATED AFFILIATES (Tables) | 12 Months Ended
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Dec. 31, 2018
Schedule of Equity Method Investments [Line Items] |
Schedule of Equity Method Investments | Investments in Unconsolidated Affiliates - The following table sets forth our investments in unconsolidated affiliates for the periods indicated:
|  | Net Ownership Interest |  | December 31, 2018 |  | December 31, 2017
|  |  |  | (Thousands of dollars)
Northern Border Pipeline |  | 50% |  | $ | 381,623 |  |  | $ | 396,800 |
Overland Pass Pipeline Company |  | 50% |  | 429,295 |  |  | 436,111 |
Roadrunner Gas Transmission |  | 50% |  | 93,857 |  |  | 93,048 |
Other |  | Various |  | 64,375 |  |  | 77,197 |
Investments in unconsolidated affiliates (a) |  | $ | 969,150 |  |  | $ | 1,003,156 |
(a) - Equity-method goodwill (Note A) was $38.8 million at December 31, 2018 and 2017.
Equity In Net Earnings From Investments |
Schedule of Equity Method Investments [Line Items] |
Schedule of Equity Method Investments | Equity in Net Earnings from Investments and Impairments - The following table sets forth our equity in net earnings from investments for the periods indicated:
|  | Years Ended December 31,
|  | 2018 |  | 2017 |  | 2016
|  | (Thousands of dollars)
Northern Border Pipeline |  | $ | 67,854 |  |  | $ | 68,153 |  |  | $ | 69,990 |
Overland Pass Pipeline Company |  | 65,887 |  |  | 60,067 |  |  | 53,984 |
Roadrunner Gas Transmission |  | 22,993 |  |  | 19,150 |  |  | 4,445 |
Other |  | 1,649 |  |  | 11,908 |  |  | 11,271 |
Equity in net earnings from investments |  | $ | 158,383 |  |  | $ | 159,278 |  |  | $ | 139,690 |
Impairment of equity investments |  | $ | — |  |  | $ | (4,270 | ) |  | $ | — |
Unconsolidated Affiliates Financial Information |
Schedule of Equity Method Investments [Line Items] |
Schedule of Equity Method Investments | Unconsolidated Affiliates Financial Information - The following tables set forth summarized combined financial information of our unconsolidated affiliates for the periods indicated:
|  | December 31, 2018 |  | December 31, 2017
|  | (Thousands of dollars)
Balance Sheet |  |  |  |
Current assets |  | $ | 158,723 |  |  | $ | 151,907 |
Property, plant and equipment, net |  | $ | 2,413,662 |  |  | $ | 2,490,692 |
Other noncurrent assets |  | $ | 16,273 |  |  | $ | 14,793 |
Current liabilities |  | $ | 83,057 |  |  | $ | 70,434 |
Long-term debt |  | $ | 480,731 |  |  | $ | 479,050 |
Other noncurrent liabilities |  | $ | 47,826 |  |  | $ | 53,830 |
Accumulated other comprehensive loss |  | $ | 2,053 |  |  | $ | (9,946 | )
Owners’ equity |  | $ | 1,974,991 |  |  | $ | 2,064,024 |
|  | Years Ended December 31,
|  | 2018 |  | 2017 |  | 2016
|  | (Thousands of dollars)
Income Statement |  |  |  |  |  |
Operating revenues |  | $ | 637,762 |  |  | $ | 639,102 |  |  | $ | 578,542 |
Operating expenses |  | $ | 276,373 |  |  | $ | 277,121 |  |  | $ | 260,753 |
Net income |  | $ | 337,694 |  |  | $ | 347,692 |  |  | $ | 293,921 |
Distributions paid to us |  | $ | 197,285 |  |  | $ | 196,114 |  |  | $ | 196,717 |

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