Subsequent Events (Details) (USD $) Share data in Thousands, unless otherwise specified	9 Months Ended		0 Months Ended		0 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Oct. 07, 2014 Auburn Bean and Grain Subsequent event	Oct. 07, 2014 Auburn Bean and Grain Subsequent event bu T gal	Oct. 17, 2014 United Grain and Keller Grain Subsequent event company	Oct. 07, 2014 Grain operations Auburn Bean and Grain Subsequent event location	Oct. 07, 2014 Agronomy operations Auburn Bean and Grain Subsequent event location
Subsequent Event [Line Items]
Number of locations acquired						6	4
Number of companies acquired					2
Percentage of shares outstanding acquired				100.00%
Purchase price			$ 39,500,000		$ 7,200,000
Cash payments to acquire businesses	0	11,148,000	5,000,000
Number of shares in stock for stock merger transaction			556
Cash paid to acquire additional facilities			20,400,000
Long-term debt assumed as part of the acquisition				$ 11,500,000
Additional grain storage capacity acquired (bushels)				18,100,000
Dry grain storage acquired (tons)				16,000
Grain storage acquired, liquid nutrient capacity (gallons)				3,700,000