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Condensed Consolidated Statements of Income (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Income Statement [Abstract]        
Net sales $ 103,022 $ 115,099 $ 360,357 $ 388,315
Cost of sales 94,210 103,499 314,673 346,638
Gross profit 8,812 11,600 45,684 41,677
Selling, general and administrative expense 5,972 7,571 18,644 21,499
Operating income 2,840 4,029 27,040 20,178
Other expense 242 49 279 51
Interest income (141) (35) (384) (122)
Interest expense 977 1,305 2,982 4,471
Income before income taxes 1,762 2,710 24,163 15,778
Provision for (benefit from) income taxes 746 (686) 8,080 4,044
Net income $ 1,016 $ 3,396 $ 16,083 $ 11,734
Basic earnings per share $ 0.11 $ 0.36 $ 1.70 $ 1.25
Diluted earnings per share $ 0.11 $ 0.36 $ 1.69 $ 1.24
Shares used in per share calculations:        
Basic 9,449 9,383 9,443 9,375
Diluted 9,517 9,499 9,498 9,458