Other Noncurrent Assets (Schedule Of Other Noncurrent Assets) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Other Noncurrent Assets [Abstract]
Investment in long-term product supply arrangements	$ 10,750	$ 12,091
Customer acquisition costs, net	22,488	21,075
Other assets	19,723	14,825
Other noncurrent assets, net	$ 52,961	$ 47,991