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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, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Condensed Consolidated Statements of Operations [Abstract]        
Net sales $ 131,041 $ 143,801 $ 273,216 $ 255,259
Cost of sales 117,464 127,130 243,139 223,820
Gross profit 13,577 16,671 30,077 31,439
Selling, general and administrative expense 6,607 5,603 13,928 12,892
Operating income 6,970 11,068 16,149 18,547
Other expense (income) (34) 284 2 397
Interest income (46) (23) (87) (23)
Interest expense 1,526 2,575 3,166 5,193
Income before income taxes 5,524 8,232 13,068 12,980
Provision for income taxes 1,920 3,255 4,730 5,071
Net income $ 3,604 $ 4,977 $ 8,338 $ 7,909
Basic earnings per share $ 0.38 $ 0.53 $ 0.89 $ 0.85
Diluted earnings per share $ 0.38 $ 0.53 $ 0.88 $ 0.85
Shares used in per share calculations:        
Basic 9,374 9,327 9,372 9,316
Diluted 9,433 9,355 9,423 9,348