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Long-Term Debt - 2021 Notes (Details) - Senior Notes - 6.5% Senior Notes due 2021 - USD ($)
Mar. 31, 2017
Mar. 31, 2016
Debt Instrument [Line Items]    
Stated interest rate 6.50%  
CVR Partners, LP    
Debt Instrument [Line Items]    
Debt instrument face amount   $ 320,000,000
Stated interest rate   6.50%
Outstanding debt $ 2,200,000  
Interest payable $ 0