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Additional Financial Information Disclosures (Tables)
 6 Months Ended
Jun. 30, 2014
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)
2014
 
2013
 
2014
 
2013
Balance at beginning of period
$
1,199

 
$
717

 
$
882

 
$
881

Net additions charged to earnings
592

 
142

 
1,178

 
342

Costs incurred
(358
)
 
(164
)
 
(627
)
 
(528
)
Balance at end of period
$
1,433

 
$
695

 
$
1,433

 
$
695