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Consolidated Statement of Operations (Unaudited) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Consolidated Statement of Operations [Abstract]    
Net sales $ 382,052 $ 294,381
Costs and expenses    
Cost of materials sold (excludes items shown separately below) 306,678 230,962
Warehouse and processing 21,222 15,590
Administrative and general 18,374 13,211
Distribution 9,059 6,208
Selling 7,141 5,804
Occupancy 2,323 1,826
Depreciation 4,770 3,467
Amortization 222  
Total costs and expenses 369,789 277,068
Operating income 12,263 17,313
Other income, net 34  
Income before interest and income taxes 12,297 17,313
Interest and other expense on debt 2,108 805
Income before income taxes 10,189 16,508
Income tax provision 3,959 6,185
Net income $ 6,230 $ 10,323
Earnings per share:    
Net income per share - basic $ 0.57 $ 0.94
Weighted average shares outstanding - basic 10,988 10,935
Net income per share - diluted $ 0.57 $ 0.94
Weighted average shares outstanding - diluted 10,997 10,945