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UNCONSOLIDATED AFFILIATES (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Equity in net earnings (loss) from investments | $ 36,570 | $ 39,363 | $ 76,757 | $ 78,927 |
Accounts Payable, Related Parties, Current | 12,300 |  | 12,300 |  | $ 13,600
Income Statement [Abstract] |  |  |  |  |
Operating revenues | 151,771 | 157,603 | 310,679 | 311,883 |
Operating expenses | 68,120 | 69,465 | 136,521 | 136,401 |
Net income | 77,913 | 92,072 | 162,393 | 173,203 |
Distributions paid to us | 48,424 | 49,760 | 98,240 | 96,680 |
Unconsolidated Affiliates [Member] |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Related Party Transaction, Expenses from Transactions with Related Parties | 38,200 | 39,400 | 75,700 | 76,100 |
Northern Border Pipeline |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Equity in net earnings (loss) from investments | 15,240 | 15,622 | 32,377 | 34,439 |
Overland Pass Pipeline Company |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Equity in net earnings (loss) from investments | 16,246 | 14,884 | 32,633 | 28,450 |
Roadrunner Gas Transmission |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Equity in net earnings (loss) from investments | 5,542 | 4,889 | 10,500 | 9,294 |
Income Statement [Abstract] |  |  |  |  |
Payments to Acquire Equity Method Investments |  |  | 0 | 4,000 |
Other Unconsolidated Affiliates |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Equity in net earnings (loss) from investments | $ (458) | $ 3,968 | $ 1,247 | $ 6,744 |

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