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Stock Repurchase (Notes) | 12 Months Ended
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Dec. 31, 2016
Stock Repurchase [Abstract] |
Repurchase Agreements, Valuation, Policy [Policy Text Block] | NOTE 5— STOCK REPURCHASE: In December 2014, CONSOL Energy’s Board of Directors approved a stock repurchase program under which CONSOL Energy could have purchased up to $250,000 of its common stock over a two year period. Under the terms of the program, CONSOL Energy was permitted to make repurchases in the open market, in privately negotiated transactions, accelerated repurchase programs or in structured share repurchase programs. Any repurchases of common stock were to be funded from available cash on hand or short-term borrowings. The program did not obligate CONSOL Energy to acquire any particular amount of common stock, and could have been modified or suspended at any time at the Company’s discretion. The program was conducted in compliance with applicable legal requirements and within the limits imposed by any credit agreement, receivables purchase agreement or indenture and was subject to market conditions and other factors. No shares were repurchased under this program during the year ended December 31, 2016. During the year ended December 31, 2015, 2,213,100 shares were repurchased and retired at an average price of $32.37 per share.

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- Definition Stock Repurchase [Abstract] + References No definition available. + Details
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- Definition Disclosure of the accounting policy for determining which carrying amount is used for securities sold under repurchase agreements and the method used to determine that amount. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 25 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=35750457&loc=d3e12762-108607 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13433-108611 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14064-108612 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 + Details
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