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Other Accrued Liabilities (Tables) | 12 Months Ended
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Dec. 31, 2016
Other Liabilities Disclosure [Abstract] |
Schedule of Accrued Liabilities [Table Text Block] |
|  | December 31,
|  | 2016 |  | 2015
Gas derivatives |  | $ | 231,573 |  |  | $ | 12,206 |
Subsidence liability |  | 104,437 |  |  | 86,860 |
Royalties |  | 44,657 |  |  | 38,707 |
Accrued interest |  | 37,366 |  |  | 38,406 |
Accrued payroll & benefits |  | 24,649 |  |  | 24,952 |
Accrued other taxes |  | 20,679 |  |  | 10,927 |
Short-term incentive compensation |  | 19,497 |  |  | 6,802 |
Deferred Revenue |  | 18,211 |  |  | 11,557 |
Equipment leases |  | 15,286 |  |  | 15,286 |
Other |  | 59,025 |  |  | 60,052 |
Current portion of long-term liabilities: |  |  |  |
Postretirement benefits other than pensions |  | 42,001 |  |  | 46,105 |
Gas well closing |  | 17,285 |  |  | 15,648 |
Mine closing |  | 14,276 |  |  | 22,599 |
Workers' compensation |  | 13,874 |  |  | 14,803 |
Pneumoconiosis benefits |  | 10,763 |  |  | 9,382 |
Long-term disability |  | 3,865 |  |  | 4,248 |
Salary retirement |  | 2,904 |  |  | 2,772 |
Reclamation |  | — |  |  | 515 |
Total Other Accrued Liabilities |  | $ | 680,348 |  |  | $ | 421,827 |

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