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Acquisitions Acquisitions from Delek Narrative (Details) - USD ($)
$ in Millions
Mar. 31, 2015
Feb. 10, 2014
El Dorado Assets [Member]    
Business Acquisition [Line Items]    
Purchase price for acquisition $ 42.5  
Historical carrying value of assets 7.6  
Tyler Assets [Member]    
Business Acquisition [Line Items]    
Purchase price for acquisition 19.4  
Historical carrying value of assets $ 11.6  
El Dorado [Member]    
Business Acquisition [Line Items]    
Purchase price for acquisition   $ 95.9
Historical carrying value of assets   $ 25.2