Goodwill and Other Intangible Assets (Details Textual) - USD ($) $ in Thousands	1 Months Ended		3 Months Ended		12 Months Ended
	Dec. 31, 2016	Dec. 31, 2014	Dec. 31, 2015	Sep. 30, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]
Goodwill impairment charge					$ 0	$ 56,166	$ 0
Goodwill	$ 63,934	$ 72,365	$ 63,934		$ 63,934	63,934	72,365	$ 58,554
Long term earnings growth percentage	2.50%				2.50%
Weighted average cost of capital percentage	8.80%				8.80%
Amortization expense for intangible assets					$ 16,800	14,500	8,800
Expected future annual amortization expense, 2017	$ 16,100				16,100
Expected future annual amortization expense, 2018	15,600				15,600
Expected future annual amortization expense, 2019	14,800				14,800
Expected future annual amortization expense, 2020	13,600				13,600
Expected future annual amortization expense, 2021	12,900				12,900
Grain
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]
Goodwill impairment charge			54,200			46,422
Goodwill	0	46,422	0		0	0	46,422	38,165
Retail
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]
Impairment charges related to software	500
Plant Nutrient
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]
Goodwill impairment charge				$ 2,000		9,744
Goodwill	59,767	21,776	$ 59,767		59,767	$ 59,767	$ 21,776	$ 16,222
Plant Nutrient | Wholesale
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]
Goodwill	$ 59,100				$ 59,100
Reporting unit, percentage of fair value in excess of carrying amount	8.00%				8.00%
Customer list | Grain
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]
Goodwill impairment charge		$ 1,500