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Vectren Fuels Acquisition (Narrative) (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Aug. 29, 2014 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  | $ 64,853 | $ 82,013 | $ 95,253 | $ 98,001 | $ 100,622 | $ 66,322 | $ 38,460 | $ 35,767 | $ 340,120 | $ 241,171 | $ 153,870
Income before income taxes |  |  |  |  |  |  |  |  |  | $ 27,570 | 10,701 | $ 29,598
Business acquisition purchase price |  |  |  |  |  |  |  |  |  |  | $ 311,453 |
Vectren Fuels [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Business acquisition purchase price | $ 311,000 |  |  |  |  |  |  |  |  |  |  |

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