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Additional Financial Information Disclosures (Tables)
 6 Months Ended
Jun. 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
 
Six months ended
 
June 30,
 
June 30,
(In thousands)
2017
 
2016
 
2017
 
2016
Balance at beginning of period
$
2,548

 
$
3,561

 
$
2,779

 
$
3,133

Net additions charged to earnings
1,231

 
398

 
1,983

 
1,238

Adjustments to pre-existing warranties
440

 
610

 
46

 
863

Costs incurred
(1,155
)
 
(1,056
)
 
(1,744
)
 
(1,721
)
Balance at end of period
$
3,064

 
$
3,513

 
$
3,064

 
$
3,513