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Selected Quarterly Financial Information (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Selected Quarterly Financial Information (unaudited)                      
Net sales $ 73,209 $ 99,324 $ 97,435 $ 61,781 $ 106,849 $ 132,715 $ 136,547 $ 139,909 $ 331,749 $ 516,020 $ 979,135
Gross profit 15,642 30,308 34,640 22,552 38,727 49,884 61,254 65,268 103,142 215,133 474,334
Income (loss) from continuing operations, net of income taxes (22,085) (6,026) (4,081) (10,071) (8,642) 7,698 11,011 16,462 (42,263) 26,529 190,502
Income (loss) from discontinued operations, net of income taxes         (413) 4,055 807 (50)   4,399 (62,515)
Net income (loss) $ (22,085) $ (6,026) $ (4,081) $ (10,071) $ (9,055) $ 11,753 $ 11,818 $ 16,412 $ (42,263) $ 30,928 $ 127,987
Basic:                      
Continuing operations (in dollars per share) $ (0.57) $ (0.16) $ (0.11) $ (0.26) $ (0.22) $ 0.20 $ 0.29 $ 0.43 $ (1.09) $ 0.69 $ 4.80
Discontinued operations (in dollars per share)         $ (0.01) $ 0.10 $ 0.02     $ 0.11 $ (1.57)
Income (loss) (in dollars per share) $ (0.57) $ (0.16) $ (0.11) $ (0.26) $ (0.23) $ 0.30 $ 0.31 $ 0.43 $ (1.09) $ 0.80 $ 3.23
Diluted :                      
Continuing operations (in dollars per share) $ (0.57) $ (0.16) $ (0.11) $ (0.26) $ (0.22) $ 0.20 $ 0.28 $ 0.42 $ (1.09) $ 0.68 $ 4.63
Discontinued operations (in dollars per share)         $ (0.01) $ 0.10 $ 0.02     $ 0.11 $ (1.52)
Income (loss) (in dollars per share) $ (0.57) $ (0.16) $ (0.11) $ (0.26) $ (0.23) $ 0.30 $ 0.30 $ 0.42 $ (1.09) $ 0.79 $ 3.11
Weighted average shares outstanding:                      
Basic (in shares) 38,904 38,841 38,764 38,716 38,698 38,577 38,370 38,261 38,807 38,477 39,658
Diluted (in shares) 38,904 38,841 38,764 38,716 38,698 39,169 38,988 38,863 38,807 39,051 41,155