Inventories (Schedule Of Inventories) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2013
Inventory Disclosure [Abstract]
Raw materials	$ 80,080	$ 84,279	$ 90,719
Work in process	4,583	3,038	3,000
Finished goods	14,354	13,894	16,488
Inventories, net	$ 99,017	$ 101,211	$ 110,207