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Acquisitions and Dispositions - Post Acquisition Operating Results (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Business Acquisition [Line Items] |  |  |  |
Earnings (Loss) Before Income Tax | $ 233,485 | $ 30,292 | $ 157,275 | $ 789,532
Operating Segments |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Revenues | 380,528 | 367,930 | 851,138 | 817,862
Earnings (Loss) Before Income Tax | 232,674 | 69,920 | 158,828 | 205,264
CNXM | Operating Segments | Midstream Acquisition |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Earnings (Loss) Before Income Tax | 44,414 | 27,795 | 76,998 | 63,329
Midstream Revenue |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Revenues | 18,895 | 23,483 | 37,338 | 49,737
Midstream Revenue | CNXM | Operating Segments | Midstream Acquisition |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Revenues | $ 78,450 | $ 61,325 | $ 151,019 | $ 125,503

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