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Related Party Transactions - Railcar Lease Agreements and Maintenance (Details) - Railcar Lease Agreement - CVR Partners, LP - American Railcar Leasing LLC
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2017
USD ($)
railcar
Jun. 30, 2016
railcar
Jun. 30, 2017
USD ($)
Related Party Transaction [Line Items]      
Number of railcars leased | railcar   115  
Rent expense | $ $ 0.2   $ 0.4
Number of railcars to be leased | railcar 70    
Term of lease agreement 5 years    
Maintenance expense | $     $ 0.2