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Goodwill and Other Intangible Assets (Details) - USD ($)	1 Months Ended	3 Months Ended		6 Months Ended
	May 31, 2018	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Jan. 03, 2018	Dec. 31, 2017	Dec. 14, 2017
Goodwill [Line Items]
Goodwill		$ 796,359,000		$ 796,359,000			$ 0
Impairment of Other Intangible Assets		18,650,000	$ 0	18,650,000	$ 0
Amortization expense		$ 1,733,000	$ 0	$ 3,655,000	$ 0
Useful life, customer relationship intangible assets				17 years
Midstream Acquisition [Member]
Goodwill [Line Items]
Goodwill						$ 796,359,000
Other intangible assets						$ 128,781,000
CNX Gathering LLC [Member]
Goodwill [Line Items]
Ownership percentage in equity method investment		50.00%		50.00%				50.00%
Customer Relationships [Member] | Midstream [Member]
Goodwill [Line Items]
Impairment of Other Intangible Assets	$ 18,650,000			$ 18,650,000

X

- Definition

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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Amount of intangible assets, excluding goodwill, acquired at the acquisition date.

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- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of a finite-lived intangible asset to fair value.

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