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Goodwill
 3 Months Ended
Mar. 27, 2020
Goodwill Disclosure [Abstract]  
Goodwill Goodwill
A summary of changes in goodwill by reportable segment is as follows:
(Thousands)
 
Performance Alloys and Composites
 
Advanced Materials
 
Precision Coatings
 
Total
Balance at December 31, 2019
 
$
1,899

 
$
50,190

 
$
26,922

 
$
79,011

Impairment charge
 
—

 
—

 
(9,053
)
 
(9,053
)
Other
 
—

 
(126
)
 
—

 
(126
)
Balance at March 27, 2020
 
$
1,899

 
$
50,064

 
$
17,869

 
$
69,832


Goodwill is reviewed annually for impairment or more frequently if impairment indicators arise. The Company conducts its annual goodwill impairment assessment as of the first day of the fourth quarter, or more frequently under certain circumstances. Goodwill is assigned to the reporting unit, which is the operating segment level or one level below the operating segment.
To date the Company has recorded $20.6 million of impairment charges related to goodwill in the LAC reporting unit. See Note I for additional information.