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Subsequent Events	3 Months Ended
	Mar. 31, 2018
Subsequent Events [Abstract]
Subsequent Events	SUBSEQUENT EVENTS: On April 30, 2018, CNX's board of directors approved and on May 2, 2018 CNX closed on an Asset Exchange Agreement, (the “AEA”), with HG Energy II Appalachia, LLC (“HG Energy”), pursuant to which, among other things, HG Energy (i) paid to CNX approximately $7,000 in cash proceeds and (ii) contributed to CNX certain undeveloped Marcellus and Utica acreage in Southwest Pennsylvania. In exchange for the foregoing, CNX (x) assigned its indirectly held 95% interest in certain non-core midstream assets and surface acreage and (y) released its indirectly held interest in certain dedicated acreage. In connection with the transactions contemplated by the AEA, CNX also agreed to certain transactions with CNXM, including the amendment of the existing gas gathering agreement between CNX and CNXM to include a forty-well minimum commitment with CNXM. The AEA could have an impact on the future cash flows that were used in determining the fair value of certain of CNX’s customer relationship intangible assets that were acquired in connection with the Midstream acquisition (see Note 6 - Acquisition and Dispositions and Note 19 - Goodwill and Other Intangible Assets). If CNX determines that the carrying value of the other intangible asset exceeds its fair value, the difference will be recognized as an impairment charge during the second quarter.

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- Definition

The entire disclosure for significant events or transactions that occurred after the balance sheet date through the date the financial statements were issued or the date the financial statements were available to be issued. Examples include: the sale of a capital stock issue, purchase of a business, settlement of litigation, catastrophic loss, significant foreign exchange rate changes, loans to insiders or affiliates, and transactions not in the ordinary course of business.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 855
-URI http://asc.fasb.org/topic&trid=2122774

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