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Other Current And Long-term Assets (Schedule Of Other Long-term Assets, Net) (Details) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Other Current And Long-term Assets [Abstract]    
Investment in long-term product supply arrangements $ 12,117 $ 10,765
Customer acquisition costs, net 41,130 28,165
Other assets 31,188 32,724
Other long-term assets, net $ 84,435 $ 71,654