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Business Acquisitions (Details) - Eagle Ford Midstream Assets [Member] - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
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Sep. 30, 2015 | Sep. 30, 2015
Business Acquisition |  |
Description of acquisition |  | The EFS Midstream system includes approximately 460 miles of natural gas and condensate gathering pipelines, ten central gathering plants, 780 MMcf/d of natural gas treating capacity and 119 MBPD of condensate stabilization capacity.
Revenues from acquired assets | $ 56.7 |
Net income from acquired assets | $ 23.8 |

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