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Consolidated Statements of Operations (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Sales    
Trade $ 744,878 $ 586,986
Costs and expenses    
Materials, labor, and other operating expenses, including related party (excluding depreciation) 644,847 510,124
Depreciation and amortization 8,477 8,119
Selling and distribution expenses 57,004 53,814
General and administrative expenses 10,046 9,048
Other (income) expense, net (134) (368)
Total costs and expenses 720,240 580,737
Income (loss) from operations 24,638 6,249
Foreign exchange gain (loss) (80) 186
Interest expense (4,891) (4,813)
Interest income 62 107
Total nonoperating income (expense) (4,909) (4,520)
Income before income taxes 19,729 1,729
Income tax provision (benefit) 61,107 (61)
Net income $ 80,836 $ 1,668
Weighted average common shares outstanding:    
Basic 37,569 29,700
Diluted 37,569 29,700
Net income per common share    
Basic $ 2.15 $ 0.06
Diluted $ 2.15 $ 0.06