| **SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Significant Accounting Policies (Tables)** | 12 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |
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| **Accounting Policies [Abstract]**                                                      |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |
| Property, Plant and Equipment, Estimated Useful Lives [Table Text Block]                | Other Property and Equipment.Other property and equipment is carried at cost. Depreciation is provided principally on the straight-line method over the assets' estimated useful lives. We review these long-lived assets for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. Recoverability of assets to be held and used is measured by a comparison of the carrying amount of the asset to estimated undiscounted future cash flows expected to be generated by the asset. If the carrying amount of the asset exceeds our estimated future cash flows, an impairment charge is recognized in the amount by which the carrying amount of the asset exceeds the fair value of the asset. Total impairments to other property and equipment was $0.8 million in 2014. There were no impairments to other property and equipment in 2013 or 2012.The following table presents the estimated useful lives of our other property and equipment:Pipelines and related facilities10 - 17 yearsTransportation and other equipment3 - 20 yearsBuildings20 - 30 years |

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Property, Plant and Equipment, Estimated Useful Lives [Table Text Block]
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