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Interim Financial Data (Unaudited) (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Interim Financial Data [Abstract]                      
Net sales $ 46,155 $ 70,819 $ 94,279 $ 96,100 $ 51,462 $ 67,916 $ 78,405 $ 69,006 $ 307,354 $ 266,789 $ 317,690
Gross profit (loss) 13,426 2,146 33,590 35,419 (1,052) 17,272 23,542 23,029 84,582 62,791 72,815
Net income (loss) $ (3,619) $ (14,312) $ 8,339 $ 12,311 $ (18,255) $ (496) $ 2,106 $ 5,057 $ 2,720 $ (11,588) $ (10,066)
Basic net income (loss) per share $ (0.22) $ (0.86) $ 0.54 $ 0.80 $ (1.18) $ (0.03) $ 0.14 $ 0.33 $ 0.17 $ (0.75) $ (0.66)
Diluted net income (loss) per share $ (0.22) $ (0.86) $ 0.48 $ 0.74 $ (1.18) $ (0.03) $ 0.12 $ 0.30 $ 0.16 $ (0.75) $ (0.66)