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Inventories (Details) (USD $)
Jun. 30, 2012
Dec. 31, 2011
Inventories    
Inventories $ 504,086,000 $ 664,144,000
Positive exchange balances on inventory exchange agreements accounted for as accounts receivable 45,600,000 65,300,000
Negative exchange balances on inventory exchange agreements accounted for as accounts payable 42,000,000 58,200,000
Inventories, excluding convenience store inventory
   
Inventories    
Inventories 497,158,000 661,531,000
Distillates: home heating oil, diesel and kerosene
   
Inventories    
Inventories 235,704,000 393,137,000
Gasoline
   
Inventories    
Inventories 95,921,000 154,303,000
Gasoline blendstocks
   
Inventories    
Inventories 96,969,000 57,970,000
Residual oil and crude oil
   
Inventories    
Inventories 68,564,000 56,121,000
Convenience store
   
Inventories    
Inventories $ 6,928,000 $ 2,613,000