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Subsequent Event (Notes)	3 Months Ended
	Mar. 31, 2017
Subsequent Event [Line Items]
Subsequent Events [Text Block]	SUBSEQUENT EVENTS: On April 3, 2017, CONSOL Energy finalized the sale of its Knox Energy LLC and Coalfield Pipeline Company subsidiaries that were previously classified as Held for Sale. At closing, CONSOL Energy received net cash proceeds of $18,944. Due to various post closing adjustments, the estimated gain on the sale of these assets was approximately $500. On May 1, 2017 CONSOL Energy finalized the sale of approximately 6,300 net undeveloped acres of the Utica-Point Pleasant Shale in Jefferson, Belmont and Guernsey counties, Ohio that were previously classified as Held for Sale. CONSOL Energy received total cash proceeds of $76,696. The estimated gain on the sale of these assets was approximately $72,000.

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Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

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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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