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Other Employee Benefits (Tables) | 12 Months Ended
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Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items] |
Schedule of Defined Benefit Plans Disclosures [Table Text Block] | The components of net periodic benefit costs are as follows:
| Pension Benefits |  | Other Postretirement Benefits
| For the Years Ended December 31, |  | For the Years Ended December 31,
| 2014 |  | 2013 |  | 2012 |  | 2014 |  | 2013 |  | 2012
Components of net periodic benefit cost: |  |  |  |  |  |  |  |  |  |  |
Service cost | $ | 17,187 |  |  | $ | 20,865 |  |  | $ | 20,466 |  |  | $ | 7,089 |  |  | $ | 18,680 |  |  | $ | 18,817 |
Interest cost | 35,363 |  |  | 36,829 |  |  | 37,586 |  |  | 44,177 |  |  | 111,687 |  |  | 135,695 |
Expected return on plan assets | (51,400 | ) |  | (51,814 | ) |  | (46,157 | ) |  | — |  |  | — |  |  | — |
Amortization of prior service (credits) | (1,217 | ) |  | (1,611 | ) |  | (1,630 | ) |  | (21,163 | ) |  | (30,552 | ) |  | (51,828 | )
Recognized net actuarial loss | 23,927 |  |  | 37,853 |  |  | 47,834 |  |  | 28,682 |  |  | 66,417 |  |  | 80,875 |
Curtailment gain | (549 | ) |  | (374 | ) |  | — |  |  | (35,633 | ) |  | (39,650 | ) |  | — |
Settlement loss (gain) | 29,095 |  |  | 39,482 |  |  | — |  |  | — |  |  | (1,348,129 | ) |  | — |
Net periodic benefit cost (credit) | $ | 52,406 |  |  | $ | 81,230 |  |  | $ | 58,099 |  |  | $ | 23,152 |  |  | $ | (1,221,547 | ) |  | $ | 183,559 |
Long term disability [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Schedule of Defined Benefit Plans Disclosures [Table Text Block] | CONSOL Energy has a Long-Term Disability Plan available to all eligible full-time salaried employees. The benefits for this plan are based on a percentage of monthly earnings, offset by all other income benefits available to the disabled.
|  | For the Years Ended
|  | December 31,
|  | 2014 |  | 2013 |  | 2012
Benefit cost (credit) |  | $ | 2,213 |  |  | $ | (687 | ) |  | $ | 6,122 |
Discount rate assumption used to determine net periodic benefit costs |  | 3.53 | % |  | 3.04 | % |  | 3.62 | %

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- Definition Tabular disclosure of one or more of the entity's defined benefit pension plans or one or more other defined benefit postretirement plans, separately for pension plans and other postretirement benefit plans including the entity's schedule of fair value of plan assets for defined benefit or other postretirement plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e2417-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=32704760&loc=d3e4179-114921 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e2439-114920 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e2410-114920 + Details
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