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Long-Term Debt - 2023 Senior Notes (Details)
Jun. 10, 2016
USD ($)
Mar. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Debt Instrument [Line Items]      
Unamortized debt discount   $ 13,000,000 $ 13,500,000
Senior Notes | 9.25% Senior Secured Notes due 2023      
Debt Instrument [Line Items]      
Stated interest rate   9.25%  
Senior Notes | 9.25% Senior Secured Notes due 2023 | CVR Partners, LP      
Debt Instrument [Line Items]      
Debt instrument face amount $ 645,000,000    
Stated interest rate 9.25%    
Unamortized debt discount $ 16,100,000    
Debt issuance costs $ 9,400,000    
Maximum fixed charge coverage ratio required to make restricted payments 1.75 1.75  
Maximum aggregated restricted payments basket permitted $ 75,000,000.0    
Debt instrument, remaining restricted payments permitted   $ 72,700,000  
Interest payable   17,600,000 2,700,000
Senior Notes | 9.25% Senior Secured Notes due 2023 | CVR Partners, LP | Level 2      
Debt Instrument [Line Items]      
Fair value of debt   $ 686,700,000 $ 694,200,000