Goodwill and Intangible Assets (Details Textual) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Goodwill [Line Items]
Goodwill	$ 51,500,000
Goodwill increase	39,000,000
Goodwill and Intangible Assets (Textual) [Abstract]
Amortization expense for intangible assets	4,800,000	2,800,000	2,400,000
Expected future annual amortization expense, 2013	5,900,000
Expected future annual amortization expense, 2014	4,300,000
Expected future annual amortization expense, 2015	3,700,000
Expected future annual amortization expense, 2016	3,500,000
Expected future annual amortization expense, 2017	3,400,000
Grain
Goodwill [Line Items]
Goodwill	35,200,000
Plant Nutrient
Goodwill [Line Items]
Goodwill	13,600,000
Turf & Specialty
Goodwill [Line Items]
Goodwill	$ 2,700,000