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Acquisitions and Dispositions - Narrative (Details)					3 Months Ended		6 Months Ended
	May 02, 2018 USD ($) well	Mar. 30, 2018 USD ($)	Jan. 03, 2018 USD ($)	Dec. 14, 2017 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)
Business Acquisition [Line Items]
Proceeds from Asset Exchange Agreement	$ 7,000,000
Minimum commitment of wells | well	40
Net gain (loss) on sale	$ 286,000				$ 387,000	$ 3,280,000	$ (2,699,000)	$ 14,622,000
Impairment of intangible asset					0	18,650,000	0	18,650,000
Gain on remeasurement of fair value of previously held equity interest					$ 0	0	$ 0	$ 623,663,000
Midstream Acquisition
Business Acquisition [Line Items]
Cash consideration transferred			$ 305,000,000	$ 305,000,000
Fair value of previously held equity interest			799,033,000
Gain on remeasurement of fair value of previously held equity interest			$ 623,663,000
Shallow Oil, Gas, and CBM Assets in Pennsylvania and West Virginia
Business Acquisition [Line Items]
Net gain (loss) on sale		$ 4,751,000
Cash consideration received in sale of oil and gas assets		89,296,000
Asset retirement obligations assumed		$ 196,514,000
CNX Gathering LLC
Business Acquisition [Line Items]
Ownership percentage in equity method investment				50.00%	50.00%		50.00%
CONE Midstream GP LLC
Business Acquisition [Line Items]
Ownership percentage by parent				100.00%
Customer Relationships
Business Acquisition [Line Items]
Impairment of intangible asset						18,650,000
Customer Relationships | Midstream Acquisition
Business Acquisition [Line Items]
Impairment of intangible asset					$ 0	$ 18,650,000

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