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Inventories (Tables)
3 Months Ended
Mar. 31, 2017
Inventories [Abstract]  
Schedule of Inventory, Current [Table Text Block]
Inventories consist of the following:
(In thousands)
 
 
March 31,
 
December 31,
 
 
 
2017
 
2016
 
Raw materials and component parts
 
$
38,630
 
$
36,821
 
Finished goods
 
 
72,689
 
 
60,156
 
 
 
 
 
 
 
 
 
 
 
$
111,319
 
$
96,977