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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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