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Inventories (Tables)
 12 Months Ended
Dec. 31, 2018
Classes of current inventories [abstract]  
Disclosure of detailed information about Inventories text block [Text Block]
 
 
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