Vectren Fuels Acquisition (Narrative) (Details) (USD $)	1 Months Ended	12 Months Ended		0 Months Ended	1 Months Ended		4 Months Ended
	Jan. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Aug. 31, 2014	Nov. 30, 2014	Sep. 30, 2014	Dec. 31, 2014	Aug. 29, 2014
Business Acquisition [Line Items]
Revenues		$ 241,171,000	$ 153,870,000
Income before income taxes		10,701,000	29,598,000
Business acquisition purchase price		311,453,000
Write off deferred financing costs	1,000,000
Vectren Fuels [Member]
Business Acquisition [Line Items]
Initial purchase price				319,000,000
Purchase price adjustment					(8,000,000)
Revenues							95,000,000
Income before income taxes							19,700,000
Closing expenses								9,000,000
Business acquisition purchase price						$ 311,000,000