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UNCONSOLIDATED AFFILIATES (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2018 | Dec. 31, 2018
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Net ownership percentage |  |  |  | 50.00% |
Investments | $ 969,150 | $ 1,003,156 |  |  |
Equity Method Goodwill | 38,800 |  |  |  |
Equity in net earnings from investments | 158,383 | 159,278 | $ 139,690 |  |
Impairment of equity investments | 0 | (4,270) | 0 |  |
Balance Sheet [Abstract] |  |  |  |  |
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 |  |  |
Income Statement [Abstract] |  |  |  |  |
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 |  |
Accounts Payable, Related Parties, Current | 14,700 | 13,600 |  |  |
Unconsolidated Affiliates [Member] |  |  |  |  |
Income Statement [Abstract] |  |  |  |  |
Related Party Transaction, Expenses from Transactions with Related Party | 153,900 | $ 156,100 | 140,300 |  |
Northern Border Pipeline [Member] |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Net ownership percentage |  | 50.00% |  | 50.00% | 50.00%
Investments | 381,623 | $ 396,800 |  |  |
Equity in net earnings from investments | 67,854 | 68,153 | 69,990 |  |
Income Statement [Abstract] |  |  |  |  |
Payments to Acquire Equity Method Investments | 0 | $ 83,000 |  |  |
Overland Pass Pipeline Company [Member] |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Net ownership percentage |  | 50.00% |  | 50.00% |
Investments | 429,295 | $ 436,111 |  |  |
Equity in net earnings from investments | 65,887 | $ 60,067 | 53,984 |  |
Roadrunner Gas Transmission [Member] |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Net ownership percentage |  | 50.00% |  | 50.00% |
Investments | 93,857 | $ 93,048 |  |  |
Equity in net earnings from investments | 22,993 | 19,150 | 4,445 |  |
Income Statement [Abstract] |  |  |  |  |
Payments to Acquire Equity Method Investments |  |  | 65,000 |  |
Other Unconsolidated Affiliates [Member] |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Investments | 64,375 | 77,197 |  |  |
Equity in net earnings from investments | $ 1,649 | $ 11,908 | $ 11,271 |  |

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