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Concentrations of Credit Risk | 12 Months Ended
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Dec. 31, 2016
CONCENTRATION OF CREDIT RISK AND MAJOR CUSTOMERS: [Abstract] |
Concentration Risk Disclosure [Text Block] | NOTE 19—CONCENTRATION OF CREDIT RISK AND MAJOR CUSTOMERS: CONSOL Energy markets natural gas primarily to gas wholesalers and thermal coal principally to electric utilities in the United States. Concentration of credit risk is summarized below:
|  | December 31,
|  | 2016 |  | 2015
Gas wholesalers |  | $ | 124,509 |  |  | $ | 72,664 |
Thermal coal utilities |  | 62,525 |  |  | 58,281 |
Coal brokers and distributors |  | 28,955 |  |  | 14,435 |
Other |  | 4,233 |  |  | 6,003 |
Total Accounts Receivable Trade |  | $ | 220,222 |  |  | $ | 151,383 |
No sales to any E&P or coal customer exceeded 10% of the Company's revenues during the year ended December 31, 2016. During the year ended December 31, 2015, coal sales to Duke Energy were $242,020, which comprised over 10% of the Company's revenues. During the year ended December 31, 2014, E&P sales to NJR Energy Services Company were $295,779, which comprised over 10% of the Company's revenues.

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- Definition The entire disclosure for any concentrations existing at the date of the financial statements that make an entity vulnerable to a reasonably possible, near-term, severe impact. This disclosure informs financial statement users about the general nature of the risk associated with the concentration, and may indicate the percentage of concentration risk as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=51801978&loc=d3e6327-108592 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13531-108611 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=51801978&loc=d3e6404-108592 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 21 -URI http://asc.fasb.org/extlink&oid=51801978&loc=d3e6442-108592 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=51801978&loc=d3e6351-108592 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13537-108611 + Details
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