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Additional Financial Information Disclosures (Tables)
 9 Months Ended
Sep. 30, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Changes in Warranty and After-Sale Costs Reserve
Changes in the Company’s warranty and after-sale costs reserve are as follows:
 
Three months ended
 
Nine months ended
 
September 30,
 
September 30,
(In thousands)
2018
 
2017
 
2018
 
2017
Balance at beginning of period
$
4,110

 
$
3,064

 
$
3,367

 
$
2,779

Net additions charged to earnings
1,048

 
919

 
3,363

 
2,902

Adjustments to pre-existing warranties
(389
)
 
168

 
(490
)
 
214

Costs incurred
(467
)
 
(738
)
 
(1,938
)
 
(2,482
)
Balance at end of period
$
4,302

 
$
3,413

 
$
4,302

 
$
3,413