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Other Current And Long-term Assets (Schedule Of Other Long-term Assets, Net) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Other Current And Noncurrent Assets [Abstract]    
Investment in long-term product supply arrangements $ 11,787us-gaap_PrepaidExpenseOtherNoncurrent $ 10,765us-gaap_PrepaidExpenseOtherNoncurrent
Customer acquisition costs, net 32,038us-gaap_DeferredCosts 28,165us-gaap_DeferredCosts
Other assets 31,610us-gaap_OtherAssetsMiscellaneousNoncurrent 32,724us-gaap_OtherAssetsMiscellaneousNoncurrent
Other long-term assets, net $ 75,435us-gaap_OtherAssetsNoncurrent $ 71,654us-gaap_OtherAssetsNoncurrent