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Other Income (Tables) | 12 Months Ended
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Dec. 31, 2016
Component of Operating Income [Abstract] |
Schedule of Other Nonoperating Income, by Component [Table Text Block] |
|  | For the Years Ended December 31,
|  | 2016 |  | 2015 |  | 2014
Equity in Earnings of Affiliates - CONE |  | $ | 48,260 |  |  | $ | 43,799 |  |  | $ | 29,807 |
Rental Income |  | 36,059 |  |  | 37,984 |  |  | 45,059 |
Right of Way Issuance |  | 27,343 |  |  | 13,289 |  |  | 7,333 |
Royalty Income - Non-Operated Coal |  | 20,083 |  |  | 15,402 |  |  | 19,653 |
Gathering Revenue |  | 10,834 |  |  | 9,530 |  |  | 23,520 |
Coal Contract Buyout |  | 6,288 |  |  | — |  |  | 30,000 |
Purchased Coal Sales |  | 5,757 |  |  | 1,596 |  |  | 9,029 |
Equity in Earnings of Affiliates - Other |  | 4,818 |  |  | 11,098 |  |  | 19,984 |
Interest Income |  | 1,507 |  |  | 2,299 |  |  | 2,303 |
Other |  | 6,357 |  |  | 9,354 |  |  | 20,772 |
Miscellaneous Other Income |  | $ | 167,306 |  |  | $ | 144,351 |  |  | $ | 207,460 |

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- References No definition available. + Details
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- Definition Tabular disclosure of the detailed components of other nonoperating income. May include methodology, assumptions and amounts for: (a) dividends, (b) interest on securities, (c) profits on securities (net of losses), and (d) miscellaneous other income items. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.7) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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