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Acquisition - Merger Related Indebtedness (Details) - USD ($) |  | 12 Months Ended
--- | --- | ---
Apr. 01, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Business Acquisition [Line Items] |  |  |  |
Payment of revolving debt |  | $ 0 | $ 49,100,000 | $ 0
Senior Notes | Second Lien Notes due 2021 |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Debt instrument face amount | $ 320,000,000.0 |  |  |
Stated interest rate | 6.50% |  |  |
Line of Credit | Wells Fargo Credit Agreement | Letter of Credit |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Borrowing capacity | $ 10,000,000.0 |  |  |
Line of Credit | Wells Fargo Credit Agreement | Term Loan |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Borrowing capacity | 50,000,000.0 |  |  |
CVR Partners, LP | Line of Credit | Wells Fargo Credit Agreement | East Dubuque Merger |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Payment of revolving debt | $ 49,400,000 |  |  |

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