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Acquisitions and Dispositions Narrative (Details) - USD ($) $ in Thousands					1 Months Ended	3 Months Ended		6 Months Ended
	May 02, 2018	Mar. 30, 2018	Jan. 03, 2018	Dec. 14, 2017	May 31, 2018	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Business Acquisition [Line Items]
Cash proceeds from Asset Exchange Agreement	$ 7,000
Net gain on sale						$ 3,280	$ 134,581	$ 14,622	$ 138,577
Impairment of Other Intangible Assets						18,650	0	18,650	0
Gain on remeasurement of fair value of previously held equity interest						$ 0	$ 0	$ 623,663	$ 0
Midstream Acquisition [Member]
Business Acquisition [Line Items]
Cash consideration transferred			$ 305,000	$ 305,000
Fair value of previously held equity interest			799,033
Gain on remeasurement of fair value of previously held equity interest			$ 623,663
Asset Exchange Agreement with HG Energy [Member]
Business Acquisition [Line Items]
Net gain on sale	$ 286
Shallow Oil, Gas, and CBM Assets in Pennsylvania and West Virginia [Member]
Business Acquisition [Line Items]
Cash consideration received in sale of oil and gas assets		$ 89,296
Asset retirement obligations assumed		196,514
Net gain on sale		$ 4,751
CNX Gathering LLC [Member]
Business Acquisition [Line Items]
Ownership percentage in equity method investment				50.00%		50.00%		50.00%
CONE Midstream GP LLC [Member]
Business Acquisition [Line Items]
Ownership percentage by parent				100.00%
Customer Relationships [Member] | Midstream [Member]
Business Acquisition [Line Items]
Impairment of Other Intangible Assets					$ 18,650			$ 18,650

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