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Revenue (Disaggregation of Revenues) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Disaggregation of Revenue [Line Items]        
Total $ 273,945 $ 156,394 $ 1,083,383 $ 706,927
Specialty nutrients        
Disaggregation of Revenue [Line Items]        
Total 45,022 36,856 236,895 206,215
Primary nutrients        
Disaggregation of Revenue [Line Items]        
Total 71,343 60,460 322,130 313,967
Service        
Disaggregation of Revenue [Line Items]        
Total 16,688 15,567 53,324 48,717
Products and co-products        
Disaggregation of Revenue [Line Items]        
Total 82,813 29,282 255,029 88,390
Frac sand and propane        
Disaggregation of Revenue [Line Items]        
Total 47,188   184,418  
Other        
Disaggregation of Revenue [Line Items]        
Total 10,891 14,229 31,587 49,638
Trade        
Disaggregation of Revenue [Line Items]        
Total 114,462 2,477 441,263 9,133
Trade | Specialty nutrients        
Disaggregation of Revenue [Line Items]        
Total 9,840 0 45,648 0
Trade | Primary nutrients        
Disaggregation of Revenue [Line Items]        
Total 4,610 0 27,401 0
Trade | Service        
Disaggregation of Revenue [Line Items]        
Total 2,507 2,232 11,077 8,386
Trade | Products and co-products        
Disaggregation of Revenue [Line Items]        
Total 48,158 0 166,859 0
Trade | Frac sand and propane        
Disaggregation of Revenue [Line Items]        
Total 47,188   184,418  
Trade | Other        
Disaggregation of Revenue [Line Items]        
Total 2,159 245 5,860 747
Ethanol        
Disaggregation of Revenue [Line Items]        
Total 38,005 32,815 98,538 98,873
Ethanol | Specialty nutrients        
Disaggregation of Revenue [Line Items]        
Total 0 0 0 0
Ethanol | Primary nutrients        
Disaggregation of Revenue [Line Items]        
Total 0 0 0 0
Ethanol | Service        
Disaggregation of Revenue [Line Items]        
Total 3,187 3,533 10,170 10,483
Ethanol | Products and co-products        
Disaggregation of Revenue [Line Items]        
Total 34,655 29,282 88,170 88,390
Ethanol | Frac sand and propane        
Disaggregation of Revenue [Line Items]        
Total 0   0  
Ethanol | Other        
Disaggregation of Revenue [Line Items]        
Total 163 0 198 0
Plant Nutrient        
Disaggregation of Revenue [Line Items]        
Total 109,446 104,189 508,548 542,911
Plant Nutrient | Specialty nutrients        
Disaggregation of Revenue [Line Items]        
Total 35,182 36,856 191,247 206,215
Plant Nutrient | Primary nutrients        
Disaggregation of Revenue [Line Items]        
Total 66,733 60,460 294,729 313,967
Plant Nutrient | Service        
Disaggregation of Revenue [Line Items]        
Total 1,275 877 3,133 3,498
Plant Nutrient | Products and co-products        
Disaggregation of Revenue [Line Items]        
Total 0 0 0 0
Plant Nutrient | Frac sand and propane        
Disaggregation of Revenue [Line Items]        
Total 0   0  
Plant Nutrient | Other        
Disaggregation of Revenue [Line Items]        
Total 6,256 5,996 19,439 19,231
Rail        
Disaggregation of Revenue [Line Items]        
Total 12,032 16,913 35,034 56,010
Rail | Specialty nutrients        
Disaggregation of Revenue [Line Items]        
Total 0 0 0 0
Rail | Primary nutrients        
Disaggregation of Revenue [Line Items]        
Total 0 0 0 0
Rail | Service        
Disaggregation of Revenue [Line Items]        
Total 9,719 8,925 28,944 26,350
Rail | Products and co-products        
Disaggregation of Revenue [Line Items]        
Total 0 0 0 0
Rail | Frac sand and propane        
Disaggregation of Revenue [Line Items]        
Total 0   0  
Rail | Other        
Disaggregation of Revenue [Line Items]        
Total $ 2,313 $ 7,988 $ 6,090 $ 29,660