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Consolidated Statements of Comprehensive Income (Parenthetical) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Consolidated Statements of Comprehensive Income      
Products, sales to affiliates $ 744,965 $ 747,064 $ 808,834
Other comprehensive income (loss), income tax benefit $ (10,318) $ 9,197 $ 12,604