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Description of Business and Summary of Significant Accounting Policies (Summary Of Inventories) (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Description of Business and Summary of Significant Accounting Policies [Abstract]    
Raw materials $ 8,804 $ 7,755
Work in process 1,803 1,299
Finished goods 11,964 13,397
Inventories $ 22,571 $ 22,451