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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2017
Accounting Policies [Abstract]  
Schedule of Product Warranty Liability
The following table summarizes the warranty activity for 2017, 2016 and 2015:
(In thousands)
 
2017
 
2016
 
2015
Warranty reserves, beginning of the year
 
$
6,281

 
$
7,844

 
$
8,886

Accruals for warranties issued during the year
 
5,528

 
6,439

 
3,656

Reductions related to pre-existing warranties
 
(3,792
)
 
(5,611
)
 
(3,042
)
Warranties paid
 
(2,078
)
 
(2,372
)
 
(1,629
)
Other (principally foreign currency translation)
 
17

 
(19
)
 
(27
)
Warranty reserves, end of the year
 
$
5,956

 
$
6,281

 
$
7,844