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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

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