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QUARTERLY FINANCIAL DATA (UNAUDITED) (Details) (USD $)
In Thousands, unless otherwise specified |
3 Months Ended | 12 Months Ended | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
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Dec. 31, 2013
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Sep. 30, 2013
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Jun. 30, 2013
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Mar. 31, 2013
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Dec. 31, 2012
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Sep. 30, 2012
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Jun. 30, 2012
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Mar. 31, 2012
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Dec. 31, 2013
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Dec. 31, 2012
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| 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 |
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Immaterial correction of an error related to an inconsistent policy related to income statement classification of shipping and handling costs | Impact of correction
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| Quarterly financial data | ||||||||||
| Gross margin | $ 19,100 | $ 21,100 | $ 10,000 | |||||||