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Guarantees (Tables)
 3 Months Ended
Mar. 31, 2015
Guarantees [Abstract]  
Changes in the carrying amount of service and product warranties
Changes in the carrying amount of service and product warranties for the three months ended March 31, are as follows:

 
2015
 
2014
 
 
 
 
Balance as of January 1,
$
2,286

 
$
2,422

 
 
 


Provision for warranties
951

 
828

 
 
 


Claims made
(873
)
 
(873
)
 
 
 


Balance as of March 31,
$
2,364

 
$
2,377