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Inventories (Tables)
 12 Months Ended
Dec. 31, 2017
Inventory Disclosure [Abstract]  
Schedule of Inventory, Current [Table Text Block]
As of December 31, 2016 and 2017, inventories consisted of the following:
 
 
 
December 31,
 
 
 
2016
 
2017
 
 
 
(in thousands)
 
 
 
 
 
 
 
 
 
Finished goods
 
$
54,357
 
 
46,365
 
Work in process
 
 
57,076
 
 
54,084
 
Raw materials
 
 
38,273
 
 
34,220
 
Supplies
 
 
42
 
 
531
 
 
 
$
149,748
 
 
135,200