Other Current and Long-Term Assets (Schedule Of Other Noncurrent Assets) (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Other Current and Long-Term Assets [Abstract]
Investment in long-term product supply arrangements	$ 10,170	$ 10,978
Customer acquisition costs, net	54,602	50,309
Other assets	35,344	36,321
Deferred income taxes	5,867	5,707
Other long-term assets	$ 105,983	$ 103,315