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Consolidated Statements of Operations (USD $)
In Thousands, except Share data
 3 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Consolidated Statements of Operations        
Net sales $ 80,374 $ 52,172 $ 147,770 $ 98,884
Cost of sales 48,381 32,939 87,504 60,727
Gross profit 31,993 19,233 60,266 38,157
Operating expenses 21,310 15,683 40,396 30,712
Operating income 10,683 3,550 19,870 7,445
Interest expense 978 906 1,785 1,806
Interest capitalized (16) (39) (74) (49)
Extinguishment of debt     546  
Income before income tax 9,721 2,683 17,613 5,688
Income tax expense 3,714 1,040 6,594 2,218
Net income $ 6,007 $ 1,643 $ 11,019 $ 3,470
Earnings per common share-basic $ 0.22 $ 0.06 $ 0.40 $ 0.13
Earnings per common share-assuming dilution $ 0.22 $ 0.06 $ 0.40 $ 0.13
Weighted average shares outstanding-basic 27,548 27,343 27,538 27,344
Weighted average shares outstanding-assuming dilution 27,838 27,650 27,813 27,633