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Additional Financial Information Disclosures (Tables)
 9 Months Ended
Sep. 30, 2017
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)
2017
 
2016
 
2017
 
2016
Balance at beginning of period
$
3,064

 
$
3,513

 
$
2,779

 
$
3,133

Net additions charged to earnings
919

 
666

 
2,902

 
1,904

Adjustments to pre-existing warranties
168

 
(255
)
 
214

 
608

Costs incurred
(738
)
 
(705
)
 
(2,482
)
 
(2,426
)
Balance at end of period
$
3,413

 
$
3,219

 
$
3,413

 
$
3,219