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UNCONSOLIDATED AFFILIATES (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Equity in net earnings (loss) from investments | $ 39,313 | $ 40,058 | $ 116,070 | $ 118,985 |
Impairment of equity investments | 0 | (4,270) | 0 | (4,270) |
Accounts Payable, Related Parties, Current | 12,600 |  | 12,600 |  | $ 13,600
Income Statement [Abstract] |  |  |  |  |
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 |
Unconsolidated Affiliates [Member] |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Related Party Transaction, Expenses from Transactions with Related Parties | 37,500 | 39,900 | 113,200 | 116,000 |
Northern Border Pipeline |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Equity in net earnings (loss) from investments | 16,486 | 16,440 | 48,863 | 50,879 |
Income Statement [Abstract] |  |  |  |  |
Payments to Acquire Equity Method Investments |  |  | 0 | 83,000 |
Overland Pass Pipeline Company |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Equity in net earnings (loss) from investments | 16,081 | 15,793 | 48,714 | 44,243 |
Roadrunner Gas Transmission |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Equity in net earnings (loss) from investments | 6,303 | 4,898 | 16,803 | 14,192 |
Income Statement [Abstract] |  |  |  |  |
Payments to Acquire Equity Method Investments |  |  | 500 | 4,000 |
Other Unconsolidated Affiliates |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Equity in net earnings (loss) from investments | $ 443 | $ 2,927 | $ 1,690 | $ 9,671 |

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