Annual report pursuant to Section 13 and 15(d)

Quarterly Results of Operations (Unaudited) (Details)

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Quarterly Results of Operations (Unaudited) (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2011
Quarterly Results of Operations (Unaudited)                      
Net sales $ 203,034 $ 200,297 $ 215,991 $ 223,632 $ 210,668 $ 218,795 $ 265,514 $ 289,856 $ 842,954 $ 984,833 $ 1,018,488
Operating income (loss) (15,927) (5,290) (14,020) (4,045) (9,992) (17,962) 24,913 40,842 (39,282) 37,801 129,261
Net income (loss) $ (25,251) $ (14,257) $ (24,921) $ (17,753) $ (11,704) $ (27,771) $ 14,318 $ 31,849 $ (82,182) $ 6,692 $ 63,044
Net income (loss) per share (basic) (in dollars per share) $ (0.56) $ (0.32) $ (0.55) $ (0.40) $ (0.26) $ (0.62) $ 0.32 $ 0.81 $ (1.83) $ 0.15 $ 2.11
Net income (loss) per share (diluted) (in dollars per share) $ (0.56) $ (0.32) $ (0.55) $ (0.40) $ (0.26) $ (0.62) $ 0.27 $ 0.61 $ (1.83) $ 0.13 $ 1.22