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Additional Financial Information Disclosures (Tables)
 3 Months Ended
Mar. 31, 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
 
March 31,
(In thousands)
2017
 
2016
Balance at beginning of period
$
2,779

 
$
3,133

Net additions charged to earnings
752

 
840

Adjustments to pre-existing warranties
(394
)
 
253

Costs incurred
(589
)
 
(665
)
Balance at end of period
$
2,548

 
$
3,561