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Long-Term Debt - 2021 Notes (Details) - USD ($)
3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Apr. 01, 2016
Debt Instrument [Line Items]                
Gain (loss) on extinguishment of debt $ 200,000 $ 0 $ (5,100,000) $ 0 $ 0 $ (4,900,000) $ 0  
Notes Payable | CVR Partners, LP | 6.5% Notes due 2021                
Debt Instrument [Line Items]                
Debt instrument face amount               $ 320,000,000
Stated interest rate               6.50%
Gain (loss) on extinguishment of debt           (4,900,000)    
Debt $ 0       $ 2,200,000 $ 0