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WARRANTIES (Tables)
 3 Months Ended
Mar. 31, 2015
Product Warranties Disclosures [Abstract]  
Changes in entity's product warranty liability
Changes to the Company’s product warranty liability for the three months ended March 31, 2015 are as follows (in thousands):

Balance at December 31, 2014
$
912

Additions charged to cost of product sales
281

Repairs and replacements
(335
)
Balance at March 31, 2015
$
858