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Acquisitions and Dispositions Post Acquisition Operating Results (Details) - CNXM [Member] - Midstream Acquisition [Member] - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2018 | Jun. 30, 2018
Business Acquisition [Line Items] |  |
Midstream Revenue | $ 61,325 | $ 125,503
Earnings From Continuing Operations Before Income Tax | $ 27,795 | $ 63,329

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