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Long-Term Debt - Nitrogen Fertilizer Partnership Credit Facility (Details) - Line of Credit - CRNF - CRNF credit facility - USD ($)
Dec. 31, 2017
Mar. 31, 2016
Term Loan    
Debt Instrument [Line Items]    
Debt instrument face amount $ 125,000,000.0  
Revolving Credit Facility    
Debt Instrument [Line Items]    
Borrowing capacity 25,000,000.0  
Uncommitted incremental facility $ 50,000,000.0  
Effective percentage rate   3.98%