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Commitments And Contingencies (Minimum Purchase Obligations) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Purchase obligations  
2015 $ 197,563us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnFirstAnniversary
2016 141,079us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnSecondAnniversary
2017 121,650us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnThirdAnniversary
2018 93,187us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnFourthAnniversary
2019 $ 72,128us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnFifthAnniversary