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Condensed Consolidated Statements of Operations (Unaudited) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Condensed Consolidated Statements of Operations [Abstract]        
Net sales $ 115,099 $ 139,265 $ 388,315 $ 394,524
Cost of sales 103,499 122,751 346,638 346,571
Gross profit 11,600 16,514 41,677 47,953
Selling, general and administrative expense 7,571 6,467 21,499 19,359
Operating income 4,029 10,047 20,178 28,594
Other expense 49 950 51 1,347
Interest income (35) (4) (122) (27)
Interest expense 1,305 2,247 4,471 7,440
Income before income taxes 2,710 6,854 15,778 19,834
(Benefit from) Provision for income taxes (686) 3,570 4,044 8,641
Net income $ 3,396 $ 3,284 $ 11,734 $ 11,193
Basic earnings per share $ 0.36 $ 0.35 $ 1.25 $ 1.20
Diluted earnings per share $ 0.36 $ 0.35 $ 1.24 $ 1.20
Shares used in per share calculations:        
Basic 9,383 9,346 9,375 9,326
Diluted 9,499 9,373 9,458 9,359