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Consolidated Statements Of Operations (USD $)
In Thousands, except Per Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Consolidated Statements Of Operations [Abstract]      
Net sales $ 304,429 $ 226,859 $ 205,801
Cost of sales 181,361 140,538 148,903
Gross profit 123,068 86,321 56,898
Operating expenses 83,842 67,130 63,227
Operating income (loss) 39,226 19,191 (6,329)
Interest expense 3,569 3,171 3,253
Interest income (3)    
Interest capitalized (109) (154) (44)
Extinguishment of Debt 546    
Income (loss) before provision for income taxes 35,223 16,174 (9,538)
Income taxes expense (benefit) 13,155 5,190 (3,749)
Net income (loss) $ 22,068 $ 10,984 $ (5,789)
Earnings (loss) per common share-basic $ 0.80 $ 0.40 $ (0.21)
Earnings (loss) per common share-assuming dilution $ 0.79 $ 0.40 $ (0.21)
Weighted average shares outstanding-basic 27,559 27,385 27,120
Weighted average shares outstanding-assuming dilution 27,875 27,652 27,120