Inventories (Schedule Of Inventories) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017
Inventory Disclosure [Abstract]
Raw materials	$ 268,054	$ 233,187	$ 156,363
Work in process	22,144	10,408	9,004
Finished goods	33,747	31,153	23,653
Inventories, net	$ 323,945	$ 274,748	$ 189,020