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Additional Financial Information Disclosures (Tables)
 6 Months Ended
Jun. 30, 2016
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)
2016
 
2015
 
2016
 
2015
Balance at beginning of period
$
3,561

 
$
1,546

 
$
3,133

 
$
1,739

Net additions charged to earnings
398

 
672

 
1,238

 
1,121

Adjustments to pre-existing warranties
610

 
232

 
863

 
118

Costs incurred
(1,056
)
 
(90
)
 
(1,721
)
 
(618
)
Balance at end of period
$
3,513

 
$
2,360

 
$
3,513

 
$
2,360