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Vectren Fuels Acquisition (Schedule of Business Acquisition Pro Forma Information) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013
Revenues [Abstract] |  |  |  |
As reported | $ 64,764 | $ 34,985 | $ 133,910 | $ 103,129
Net income applicable to common shareholders |  |  |  |
As reported | (5,768) |  | 803 |
Net Income (Loss) per Share [Abstract] |  |  |  |
As reported | $ (0.20) | $ 0.17 | $ 0.03 | $ 0.65
Vectren Fuels [Member] |  |  |  |
Revenues [Abstract] |  |  |  |
As reported |  |  | 140,549 | 116,058
Pro forma |  |  | 361,464 | 335,625
Net income applicable to common shareholders |  |  |  |
As reported |  |  | 826 | 18,463
Pro forma |  |  | $ 33,843 | $ 34,877
Net Income (Loss) per Share [Abstract] |  |  |  |
As reported |  |  | $ 0.03 | $ 0.65
Pro forma |  |  | $ 1.18 | $ 1.22

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- Definition The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2)-(3) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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- Definition Revenue derived from sale of coal and related products. Also includes rendering of services and selling of products for exploration, development, mining, and processing, as well as supporting activities. + 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 210.5-03.1(a),(d)) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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