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Commitments and Contingencies - Joint Venture Agreement (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2016
Sep. 30, 2016
Sep. 30, 2015
Related Party Transaction [Line Items]      
Investment in joint venture   $ 3.2 $ 0.0
Coffeyville Resources Pipeline, LLC | Velocity Pipeline Partners, LLC      
Related Party Transaction [Line Items]      
Joint venture interest 40.00% 40.00%  
Investment in joint venture $ 3.2    
Total expected investment in joint venture $ 9.3 $ 9.3  
Velocity Central Oklahoma Pipeline LLC | Velocity Pipeline Partners, LLC      
Related Party Transaction [Line Items]      
Joint venture interest held by others 60.00% 60.00%