v2.4.0.8

QUARTERLY FINANCIAL DATA (UNAUDITED) (Details) (USD $) In Thousands, 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
Quarterly financial data |  |  |  |  |  |  |  |  |  |
Gross margin | $ 185,800 | $ 193,500 | $ 210,000 | $ 152,200 | $ 129,800 | $ 140,300 | $ 86,800 | $ 103,500 | $ 741,500 | $ 460,400
Immaterial correction of an error related to an inconsistent policy related to income statement classification of shipping and handling costs | Impact of correction |  |  |  |  |  |  |  |  |  |
Quarterly financial data |  |  |  |  |  |  |  |  |  |
Gross margin |  | $ 19,100 | $ 21,100 | $ 10,000 |  |  |  |  |  |

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