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Derivative Instruments
 12 Months Ended
Dec. 31, 2012
Derivative Instruments and Hedges, Assets [Abstract]  
Derivative Instruments
Derivative Instruments

From time to time, we enter into forward fuel contracts to limit the exposure to price fluctuations for physical purchases of finished products in the normal course of business.
We use derivatives to reduce normal operating and market risks with a primary objective in derivative instrument use being the reduction of the impact of market price volatility on our results of operations. The following discussion provides additional details regarding the types of derivative contracts held during the years ended December 31, 2012, 2011 and 2010.
Forward Fuel Contracts
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 years ended December 31, 2012 and 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 of $0.1 million, $0.7 million and $0.6 million on forward fuel contracts during the years ended December 31, 2012, 2011 and 2010, respectively, which are included as an adjustment to cost of goods sold in the accompanying consolidated statements of operations. There were nominal unrealized gains related to these forward fuel contracts held on the consolidated balance sheets as of December 31, 2012 and 2011.