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Guarantees (Tables)
 9 Months Ended
Sep. 30, 2013
Guarantees [Abstract]  
Changes in the carrying amount of service and product warranties
Changes in the carrying amount of service and product warranties for the nine months ended September 30, are as follows:
 
 
2012
 
2013
 
 
 
 
Balance as of January 1,
$
3,618

 
$
3,636

 


 


Provision for warranties
3,136

 
2,310

 


 


Claims made
(3,093
)
 
(2,927
)
 


 


Balance as of September 30,
$
3,661

 
$
3,019