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Other Current and Long-Term Assets (Schedule Of Other Noncurrent Assets) (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Other Current and Long-Term Assets [Abstract]    
Investment in long-term product supply arrangements $ 11,918 $ 12,165
Customer acquisition costs, net 45,681 43,570
Other assets 32,985 29,755
Other long-term assets $ 90,584 $ 85,490