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Business Acquisition (Details Textual) - USD ($)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
May 18, 2015
Dec. 31, 2014
Business Acquisition [Line Items]          
Goodwill $ 6,024,000 $ 63,934,000 $ 63,934,000   $ 72,365,000
Grain          
Business Acquisition [Line Items]          
Goodwill 1,171,000 0 0   46,422,000
Plant Nutrient          
Business Acquisition [Line Items]          
Goodwill 686,000 $ 59,767,000 $ 59,767,000   $ 21,776,000
Insignificant Acquisition in 2017 | Grain          
Business Acquisition [Line Items]          
Purchase price of acquisition 3,500,000        
Kay Flow Industries, Inc.          
Business Acquisition [Line Items]          
Percentage of shares outstanding acquired       100.00%  
Contingent consideration, minimum       $ 0  
Contingent consideration, maximum       24,000,000  
Fair value of consideration for acquisition $ 0     129,429,000  
Contingent consideration       400,000  
Goodwill       47,735,000  
Kay Flow Industries, Inc. | Plant Nutrient          
Business Acquisition [Line Items]          
Goodwill       $ 47,700,000