Vectren Fuels Acquisition (Narrative) (Details) (USD $)	3 Months Ended		9 Months Ended		1 Months Ended	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014 Vectren Fuels [Member]	Sep. 30, 2014 Vectren Fuels [Member]	Aug. 29, 2014 Vectren Fuels [Member]
Business Acquisition [Line Items]
Revenues	$ 66,322,000	$ 37,660,000	$ 140,549,000	$ 116,058,000	$ 26,600,000
Income before income taxes	(7,209,000)	6,498,000	1,003,000	24,675,000	2,500,000
Closing expenses							7,900,000
Business acquisition purchase price					$ 320,000,000	$ (319,762,000)