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Consolidated Statements of Comprehensive Income (Parenthetical) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Consolidated Statement of Comprehensive Income      
Products, sales to affiliates $ 846,076us-gaap_RevenueFromRelatedParties $ 744,965us-gaap_RevenueFromRelatedParties $ 747,064us-gaap_RevenueFromRelatedParties
Other comprehensive income (loss), income tax benefit $ 26,835us-gaap_OtherComprehensiveIncomeLossTax $ (10,318)us-gaap_OtherComprehensiveIncomeLossTax $ 9,197us-gaap_OtherComprehensiveIncomeLossTax