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Inventories
 12 Months Ended
Dec. 31, 2018
Classes of current inventories [abstract]  
Disclosure of inventories [text block]
Note 12.
Inventories
 
  
January 1,
  
December 31,
  
December 31,
 
  
2017
  
2017
  
2018
 
  
(in thousands)
 
       
Finished goods $54,357   46,365   41,557 
Work in process  57,076   54,084   77,159 
Raw materials  38,273   34,220   43,028 
Supplies  42   531   817 
  
$
149,748
   
135,200
   
162,561
 
 
The amounts of inventories that were charged to cost of revenues were $505,844 thousand and $536,966 thousand, respectively, and the charges for inventories written down to net realizable value amounted to $12,298 thousand and $17,724 thousand for the years ended December 31, 2017 and 2018, respectively, which were also included in cost of revenues.
 
As of January 1, 2017, December 31, 2017 and 2018, none of the Company’s inventories was pledged as collateral.