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Derivative Instruments
 9 Months Ended
Sep. 30, 2012
Derivative Instruments and Hedges, Assets [Abstract]  
Derivative Instruments
Derivative Instruments
From time to time, we enter into forward fuel contracts with major financial institutions that fix the purchase price of finished grade fuel for a predetermined number of units at a future date and have fulfillment terms of less than 90 days. During the three and nine months ended September 30, 2012 and September 30, 2011, we did not elect to apply hedging treatment to our derivative positions and, therefore, all changes in fair value are reflected in the statements of operations. We recognized gains (losses) of a nominal amount and $0.2 million on forward fuel contracts during the three and nine months ended September 30, 2012, respectively, and $(0.1) million and $0.4 million during the three and nine months ended September 30, 2011, respectively, which are included as an adjustment to cost of goods sold in the accompanying condensed combined statements of operations. There were no unrealized gains or losses related to these forward fuel contracts held on the condensed combined balance sheet as of September 30, 2012. There were nominal unrealized gains held on the condensed combined balance sheet as of December 31, 2011