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Restructuring (Tables)
 12 Months Ended
Dec. 31, 2019
Restructuring and Related Activities [Abstract]  
Restructuring
These costs are presented in the Company's segment results as follows:
(Thousands)
 
2019
 
2018
 
2017
Performance Alloys & Composites
 
$
—

 
$
—

 
$
(16
)
Advanced Materials
 
—

 
5,599

 
—

Precision Coatings
 
328

 
—

 
431

Other
 
457

 
—

 
229

Total
 
$
785

 
$
5,599

 
$
644