Other Noncurrent Assets (Schedule Of Other Noncurrent Assets) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Other Noncurrent Assets [Abstract]
Investment in long-term product supply arrangements	$ 10,079	$ 10,324
Customer acquisition costs, net	21,187	21,795
Other assets	19,740	18,942
Other long-term assets, net	$ 51,006	$ 51,061