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Sale of Assets (Details)
$ in Thousands
12 Months Ended
Mar. 31, 2017
USD ($)
location
May 02, 2016
USD ($)
location
Dec. 31, 2017
USD ($)
location
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Business Acquisition [Line Items]          
Gain on sale of fixtures     $ 14,401 $ 667 $ 20,802
Other Income          
Business Acquisition [Line Items]          
Gain on sale of fixtures     $ 1,200    
Retail Site          
Business Acquisition [Line Items]          
Number of locations sold | location     3    
Cash received from sale of assets     $ 14,700    
Retail Site | Other Income          
Business Acquisition [Line Items]          
Gain on sale of businesses     $ 8,600    
Farm Center | FLORIDA          
Business Acquisition [Line Items]          
Number of locations sold | location 4        
Cash received from sale of assets $ 17,400        
Working Capital Adjustment Receivable 3,600        
Farm Center | FLORIDA | Other Income          
Business Acquisition [Line Items]          
Gain on sale of businesses $ 4,700        
Grain and Agronomy | IOWA          
Business Acquisition [Line Items]          
Number of locations sold | location   8      
Cash received from sale of assets   $ 54,300