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Consolidated Statements of Comprehensive Income (Parenthetical) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Consolidated Statements of Comprehensive Income |  |  |
Products, sales to affiliates | $ 747,064 | $ 808,834 | $ 500,265
Other comprehensive income (loss), income tax benefit | $ 9,197 | $ 12,604 | $ 5,443

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