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UNCONSOLIDATED AFFILIATES (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Schedule of Equity Method Investments [Line Items] |  |  |
Net ownership percentage | 50.00% |  |
Investments in unconsolidated affiliates | $ 861,844 | $ 969,150 | $ 1,003,156
Equity method goodwill | 38,800 | 38,800 |
Equity in net earnings from investments | 154,541 | 158,383 | 159,278
Impairment of equity investments | 0 | 0 | (4,270)
Balance Sheet [Abstract] |  |  |
Current assets | 149,564 | 158,723 |
Property, plant and equipment, net | 2,314,631 | 2,413,662 |
Other noncurrent assets | 13,252 | 16,273 |
Current liabilities | 88,142 | 83,057 |
Long-term debt | 581,327 | 480,731 |
Other noncurrent liabilities | 76,685 | 47,826 |
Accumulated other comprehensive income (loss) | (28,373) | 2,053 |
Owners’ equity | 1,759,666 | 1,974,991 |
Income Statement [Abstract] |  |  |
Revenues | 634,135 | 637,762 | 639,102
Operating expenses | 291,210 | 276,373 | 277,121
Net income | 315,274 | 337,694 | 347,692
Distributions paid to us | 257,644 | 197,285 | 196,114
Accounts Payable, Related Parties, Current | 13,500 | 14,700 |
Unconsolidated Affiliates [Member] |  |  |
Income Statement [Abstract] |  |  |
Related Party Transaction, Expenses from Transactions with Related Party | $ 164,700 | $ 153,900 | 156,100
Northern Border Pipeline [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Net ownership percentage | 50.00% | 50.00% |
Investments in unconsolidated affiliates | $ 307,209 | $ 381,623 |
Equity in net earnings from investments | 68,871 | 67,854 | 68,153
Income Statement [Abstract] |  |  |
Distributions paid to us | 50,000 |  |
Payments to Acquire Equity Method Investments | $ 0 | $ 0 | 83,000
Overland Pass Pipeline Company [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Net ownership percentage | 50.00% | 50.00% |
Investments in unconsolidated affiliates | $ 417,473 | $ 429,295 |
Equity in net earnings from investments | $ 63,698 | $ 65,887 | 60,067
Roadrunner Gas Transmission [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Net ownership percentage | 50.00% | 50.00% |
Investments in unconsolidated affiliates | $ 80,816 | $ 93,857 |
Equity in net earnings from investments | 26,839 | 22,993 | 19,150
Other Unconsolidated Affiliates [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Investments in unconsolidated affiliates | 56,346 | 64,375 |
Equity in net earnings from investments | $ (4,867) | $ 1,649 | $ 11,908

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