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Acquisition - Merger Related Indebtedness (Details) - USD ($)		12 Months Ended
	Apr. 01, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Business Acquisition [Line Items]
Payment of revolving debt		$ 49,100,000	$ 0	$ 0
Senior Notes | Second Lien Notes due 2021
Business Acquisition [Line Items]
Debt instrument face amount	$ 320,000,000.0
Debt instrument, percentage rate (as a percent)	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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-Publisher FASB
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-SubTopic 30
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