Other Current and Long-Term Assets (Schedule Of Other Long-term Assets) (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Other Current and Long-Term Assets [Abstract]
Investment in long-term product supply arrangements	$ 9,060	$ 10,978
Customer acquisition costs, net	62,242	50,309
Other assets	35,111	36,321
Deferred income taxes	7,914	5,707
Other long-term assets	$ 114,327	$ 103,315