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Condensed Consolidated Statements of Operations (Unaudited) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Condensed Consolidated Statements of Operations [Abstract]        
Net sales $ 116,738 $ 131,041 $ 257,335 $ 273,216
Cost of sales 101,070 117,464 220,463 243,139
Gross profit 15,668 13,577 36,872 30,077
Selling, general and administrative expense 6,288 6,607 12,672 13,928
Operating income 9,380 6,970 24,200 16,149
Other expense (income) (4) (34) 37 2
Interest income (60) (46) (243) (87)
Interest expense 956 1,526 2,005 3,166
Income before income taxes 8,488 5,524 22,401 13,068
Provision for income taxes 2,927 1,920 7,334 4,730
Net income $ 5,561 $ 3,604 $ 15,067 $ 8,338
Basic earnings per share $ 0.59 $ 0.38 $ 1.60 $ 0.89
Diluted earnings per share $ 0.59 $ 0.38 $ 1.59 $ 0.88
Shares used in per share calculations:        
Basic 9,443 9,374 9,440 9,372
Diluted 9,481 9,433 9,474 9,423