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Additional Financial Information Disclosures (Tables)
 9 Months Ended
Sep. 30, 2013
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
 
Nine months ended
 
September 30,
 
September 30,
(In thousands)
2013
 
2012
 
2013
 
2012
Balance at beginning of period
$
695

 
$
1,152

 
$
881

 
$
1,593

Net additions charged to earnings
264

 
86

 
606

 
431

Costs incurred
(275
)
 
(325
)
 
(803
)
 
(1,111
)
Balance at end of period
$
684

 
$
913

 
$
684

 
$
913