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Mine Closing, Reclamation, and Gas Well Closing ARO Accounting Policy (Policies) | 12 Months Ended
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Dec. 31, 2016
MINE CLOSING, RECLAMATION & GAS WELL CLOSING [Abstract] |
Asset Retirement Obligation Disclosure [Text Block] | NOTE 7—GAS WELL CLOSING and MINE CLOSING: CONSOL Energy accrues for dismantling and removing costs of natural gas related facilities, mine closing costs, perpetual water care costs, and surface reclamation using the accounting treatment prescribed by the Asset Retirement and Environmental Obligations Topic of the FASB Accounting Standards Codification. CONSOL Energy recognizes capitalized asset retirement costs by increasing the carrying amount of related long-lived assets. The obligation for asset retirements is included in Gas Well Closing, Mine Closing and Other Accrued Liabilities on the Consolidated Balance Sheets. The reconciliation of changes in the asset retirement obligations at December 31, 2016 and 2015 is as follows:
|  | As of December 31,
|  | 2016 |  | 2015
Balance at beginning of period |  | $ | 429,967 |  |  | $ | 454,832 |
Accretion expense |  | 23,924 |  |  | 32,438 |
Payments |  | (15,882 | ) |  | (18,033 | )
Revisions in estimated cash flows |  | 36,320 |  |  | (33,984 | )
Other |  | (785 | ) |  | (5,286 | )
Balance at end of period |  | $ | 473,544 |  |  | $ | 429,967 |
For the year ended December 31, 2015, Other includes ($2,133) related to the disposition of two Perpetual Care sites as part of the WAE sale (see Note 3 - Acquisitions and Dispositions for more information) and ($2,355) related to the disposition of a non-producing mine.
Asset Retirement Obligations, Policy [Policy Text Block] | : CONSOL Energy accrues for dismantling and removing costs of gas-related facilities, mine closing costs, perpetual water care costs, and surface reclamation using the accounting treatment prescribed by the Asset Retirement and Environmental Obligations Topic of the FASB Accounting Standards Codification. This topic requires the fair value of an asset retirement obligation be recognized in the period in which it is incurred if a reasonable estimate of fair value can be made. Accrued costs of dismantling and removing natural gas-related facilities, mine closing costs (including surface reclamation costs) and perpetual care costs are regularly reviewed by management and are revised for changes in future estimated costs and regulatory requirements. The present value of the estimated asset retirement costs is capitalized as part of the carrying amount of the long-lived asset. Amortization of the capitalized asset retirement cost is generally determined on a units-of-production basis. Accretion of the asset retirement obligation is recognized over time and generally will escalate over the life of the producing asset, typically as production declines. Accretion is included in Deprecation, Depletion and Amortization on the Consolidated Statements of Income. Asset retirement obligations primarily relate to the closure of natural gas wells and coal mines, which includes treatment of water and the reclamation of land upon exhaustion of coal and natural gas reserves. CONSOL Energy accrues for dismantling and removing costs of natural gas related facilities, mine closing costs, perpetual water care costs, and surface reclamation using the accounting treatment prescribed by the Asset Retirement and Environmental Obligations Topic of the FASB Accounting Standards Codification. CONSOL Energy recognizes capitalized asset retirement costs by increasing the carrying amount of related long-lived assets. The obligation for asset retirements is included in Gas Well Closing, Mine Closing and Other Accrued Liabilities on the Consolidated Balance Sheets.

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- Definition MINE CLOSING, RECLAMATION & GAS WELL CLOSING [Abstract] + References No definition available. + Details
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- Definition The entire disclosure for an asset retirement obligation and the associated long-lived asset. An asset retirement obligation is a legal obligation associated with the disposal or retirement from service of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7569-110849 + Details
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- Definition Disclosure of accounting policy for determining amounts to accrue and charge against earnings so as to satisfy legal obligations associated with the retirement (through sale, abandonment, recycling, or disposal in some other manner) of a tangible long-lived asset that result from the acquisition, construction, or development and (or) the normal operation of a long-lived asset. This accounting policy disclosure excludes obligations arising 1) in connection with leased property, whether imposed by a lease agreement or by a party other than the lessor, that meet the definition of either minimum lease payments or contingent rentals; 2) solely from a plan to sell or otherwise dispose of a long-lived asset and 3) from certain environmental remediation liabilities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=51655414&loc=d3e18780-107790 + Details
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