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Long-Term Debt - Nitrogen Fertilizer Partnership Credit Facility (Details) - CRNF credit facility - USD ($)
12 Months Ended
Apr. 01, 2016
Dec. 31, 2016
Term Loan | Line of Credit    
Debt Instrument [Line Items]    
Payment of accrued interest $ 300,000  
CRNF    
Debt Instrument [Line Items]    
Effective percentage rate   4.60%
CRNF | Eurodollar    
Debt Instrument [Line Items]    
Basis spread on variable rate (as a percent)   3.50%
CRNF | Prime Rate    
Debt Instrument [Line Items]    
Basis spread on variable rate (as a percent)   2.50%
CRNF | Term Loan | Line of Credit    
Debt Instrument [Line Items]    
Debt instrument face amount   $ 125,000,000.0
CRNF | Revolving Credit Facility | Line of Credit    
Debt Instrument [Line Items]    
Borrowing capacity   25,000,000.0
Uncommitted incremental facility   $ 50,000,000.0