Other Current and Noncurrent Assets (Schedule Of Other Noncurrent Assets) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Other Current and Noncurrent Assets [Abstract]
Investment in long-term product supply arrangements	$ 10,978	$ 12,165
Customer acquisition costs, net	50,309	43,570
Other assets	42,028	29,755
Total other long-term assets	$ 103,315	$ 85,490