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Additional Financial Information Disclosures (Tables)
 6 Months Ended
Jun. 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
 
Six months ended
 
June 30,
 
June 30,
(In thousands)
2018
 
2017
 
2018
 
2017
Balance at beginning of period
$
3,702

 
$
2,548

 
$
3,367

 
$
2,779

Net additions charged to earnings
1,274

 
1,231

 
2,315

 
1,983

Adjustments to pre-existing warranties
(48
)
 
440

 
(101
)
 
46

Costs incurred
(818
)
 
(1,155
)
 
(1,471
)
 
(1,744
)
Balance at end of period
$
4,110

 
$
3,064

 
$
4,110

 
$
3,064