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Condensed Consolidated Statements Of Operations (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Condensed Consolidated Statements Of Operations [Abstract]    
Net sales $ 142,175 $ 111,458
Cost of sales 125,675 96,690
Gross profit 16,500 14,768
Selling, general and administrative expense 7,321 7,289
Operating income 9,179 7,479
Other expense 36 113
Interest income (41)  
Interest expense 1,640 2,618
Income before income taxes 7,544 4,748
Provision for income taxes 2,810 1,816
Net income $ 4,734 $ 2,932
Basic earnings per share $ 0.51 $ 0.32
Diluted earnings per share $ 0.50 $ 0.31
Shares used in per share calculations:    
Basic 9,369 9,304
Diluted 9,412 9,344