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Supplemental Quarterly Info (Unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015
SUPPLEMENTAL QUARTER INFORMATION: [Abstract] |  |
Schedule of Quarterly Financial Information [Table Text Block] | Supplemental Quarterly Information (unaudited): (Dollars in thousands, except per share data)
|  | Three Months Ended
|  | March 31, |  | June 30, |  | September 30, |  | December 31,
|  | 2016 |  | 2016 |  | 2016 |  | 2016
Sales (A) |  | $ | 478,864 |  |  | $ | 235,251 |  |  | $ | 688,590 |  |  | $ | 390,398 |
Freight Revenue |  | $ | 13,110 |  |  | $ | 11,447 |  |  | $ | 9,392 |  |  | $ | 12,519 |
Costs and Expenses (B) |  | $ | 329,071 |  |  | $ | 369,392 |  |  | $ | 361,551 |  |  | $ | 415,224 |
Freight Expense |  | $ | 13,110 |  |  | $ | 11,447 |  |  | $ | 9,392 |  |  | $ | 12,519 |
(Loss) Income from Continuing Operations |  | $ | (43,291 | ) |  | $ | (234,044 | ) |  | $ | 62,568 |  |  | $ | (321,198 | )
(Loss) Income from Discontinued Operations |  | $ | (53,167 | ) |  | $ | (234,605 | ) |  | $ | (34,975 | ) |  | $ | 19,564 |
Net (Loss) Income Attributable to CONSOL Energy Shareholders |  | $ | (97,572 | ) |  | $ | (469,828 | ) |  | $ | 25,345 |  |  | $ | (306,047 | )
Earnings Per Share |  |  |  |  |  |  |  |
Basic: |  |  |  |  |  |  |  |
(Loss) Income from Continuing Operations |  | $ | (0.19 | ) |  | $ | (1.03 | ) |  | $ | 0.26 |  |  | $ | (1.42 | )
(Loss) Income from Discontinued Operations |  | $ | (0.24 | ) |  | $ | (1.02 | ) |  | $ | (0.15 | ) |  | $ | 0.09 |
Net (Loss) Income |  | $ | (0.43 | ) |  | $ | (2.05 | ) |  | $ | 0.11 |  |  | $ | (1.33 | )
Dilutive: |  |  |  |  |  |  |  |
(Loss) Income from Continuing Operations |  | $ | (0.19 | ) |  | $ | (1.03 | ) |  | $ | 0.26 |  |  | $ | (1.42 | )
(Loss) Income from Discontinued Operations |  | $ | (0.24 | ) |  | $ | (1.02 | ) |  | $ | (0.15 | ) |  | $ | 0.09 |
Net (Loss) Income |  | $ | (0.43 | ) |  | $ | (2.05 | ) |  | $ | 0.11 |  |  | $ | (1.33 | )
|  | Three Months Ended
|  | March 31, |  | June 30, |  | September 30, |  | December 31,
|  | 2015 |  | 2015 |  | 2015 |  | 2015
Sales (A) |  | $ | 715,740 |  |  | $ | 503,825 |  |  | $ | 631,979 |  |  | $ | 602,772 |
Freight Revenue |  | $ | 5,018 |  |  | $ | 2,750 |  |  | $ | 2,436 |  |  | $ | 10,295 |
Costs and Expenses (B) |  | $ | 399,281 |  |  | $ | 351,200 |  |  | $ | 267,826 |  |  | $ | 243,267 |
Freight Expense |  | $ | 5,018 |  |  | $ | 2,750 |  |  | $ | 2,436 |  |  | $ | 10,295 |
Income (Loss) from Continuing Operations (C) |  | $ | 52,964 |  |  | $ | (577,884 | ) |  | $ | 129,312 |  |  | $ | 45,342 |
Income (Loss) from Discontinued Operations |  | $ | 26,067 |  |  | $ | (25,417 | ) |  | $ | (3,842 | ) |  | $ | (11,017 | )
Net Income (Loss) Attributable to CONSOL Energy Shareholders |  | $ | 79,031 |  |  | $ | (603,301 | ) |  | $ | 118,980 |  |  | $ | 30,405 |
Earnings Per Share |  |  |  |  |  |  |  |
Basic: |  |  |  |  |  |  |  |
Income (Loss) from Continuing Operations |  | $ | 0.23 |  |  | $ | (2.52 | ) |  | $ | 0.54 |  |  | $ | 0.18 |
Income (Loss) from Discontinued Operations |  | $ | 0.11 |  |  | $ | (0.12 | ) |  | $ | (0.02 | ) |  | $ | (0.05 | )
Net Income (Loss) |  | $ | 0.34 |  |  | $ | (2.64 | ) |  | $ | 0.52 |  |  | $ | 0.13 |
Dilutive: |  |  |  |  |  |  |  |
Income (Loss) from Continuing Operations |  | $ | 0.23 |  |  | $ | (2.52 | ) |  | $ | 0.54 |  |  | $ | 0.18 |
Income (Loss) from Discontinued Operations |  | $ | 0.11 |  |  | $ | (0.12 | ) |  | $ | (0.02 | ) |  | $ | (0.05 | )
Net Income (Loss) |  | $ | 0.34 |  |  | $ | (2.64 | ) |  | $ | 0.52 |  |  | $ | 0.13 |

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- Definition Tabular disclosure of the quarterly financial data in the annual financial statements. The disclosure includes financial information for each fiscal quarter for the current and previous year, including revenues, gross profit, income (loss) before extraordinary items and cumulative effect of a change in accounting principle and earnings per share data. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a)-(j) -URI http://asc.fasb.org/extlink&oid=51825399&loc=d3e1280-108306 + Details
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