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Major Customers (Tables)
12 Months Ended
Dec. 31, 2017
Major Customers [Abstract]  
Schedule Of Sales To Largest Customers

Sales to our largest customers were as follows for the indicated periods:

Year ended December 31,
(in thousands)201720162015
International Business Machines Corporation$284,636$*$284,098
Applied Materials, Inc.$248,183$*$*

* amount is less than 10% of total.