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Condensed Consolidated Statements of Operations (USD $)
In Thousands, except Per Share data
3 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Condensed Consolidated Statements of Operations [Abstract]        
Sales $ 733,770 $ 514,652 $ 1,339,010 $ 999,269
Cost of sales 683,205 465,033 1,241,581 917,974
Gross profit 50,565 49,619 97,429 81,295
Operating costs and expenses:        
Selling, general and administrative 10,467 8,321 20,995 15,491
Transportation 22,691 19,956 45,766 40,202
Taxes other than income taxes 1,203 1,098 2,563 2,123
Insurance recoveries (7,910)   (8,698)  
Other 703 480 1,238 808
Operating income 23,411 19,764 35,565 22,671
Other income (expense):        
Interest expense (10,544) (7,277) (18,025) (14,711)
Debt extinguishment costs (15,130)   (15,130)  
Realized loss on derivative instruments (2,370) (5,297) (1,984) (5,858)
Unrealized loss on derivative instruments (3,124) (8,008) (3,541) (15,766)
Other 274 9 103 (50)
Total other expense (30,894) (20,573) (38,577) (36,385)
Net loss before income taxes (7,483) (809) (3,012) (13,714)
Income tax expense 168 98 438 260
Net loss (7,651) (907) (3,450) (13,974)
Allocation of net loss:        
Net loss (7,651) (907) (3,450) (13,974)
Less:General partner's interest in net loss (153) (18) (69) (279)
Less:Holders of incentive distribution rights        
Net loss available to limited partners $ (7,498) $ (889) $ (3,381) $ (13,695)
Weighted average limited partner units outstanding - basic and diluted 39,886 35,359 38,373 35,355
Limited partners' interest basic and diluted net loss per unit $ (0.19) $ (0.03) $ (0.09) $ (0.39)
Cash distributions declared per limited partner unit $ 0.495 $ 0.455 $ 0.97 $ 0.91