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Acquisitions and Dispositions - Post Acquisition Operating Results (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Business Acquisition [Line Items] |  |  |  |
Earnings (Loss) Before Income Tax | $ 192,862 | $ 203,434 | $ 350,137 | $ 992,965
Operating Segments |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Revenues | 312,768 | 375,218 | 1,163,906 | 1,193,081
Earnings (Loss) Before Income Tax | 192,971 | 85,604 | 351,799 | 290,868
CNXM | Operating Segments |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Earnings (Loss) Before Income Tax | 41,741 | 31,173 | 118,739 | 94,502
CNXM | Operating Segments | Midstream Acquisition |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Earnings (Loss) Before Income Tax | 41,741 | 31,173 | 118,739 | 94,502
Midstream Revenue |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Revenues | 18,525 | 19,946 | 55,863 | 69,684
Midstream Revenue | CNXM | Operating Segments | Midstream Acquisition |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Revenues | $ 74,261 | $ 61,372 | $ 225,280 | $ 186,875

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