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Guarantees (Tables)
 9 Months Ended
Sep. 30, 2018
Guarantees [Abstract]  
Changes in the carrying amount of service and product warranties
Changes in the carrying amount of service and product standard warranties for the nine months ended September 30, are as follows:
 
2018
 
2017
Balance as of January 1,
$
1,750

 
$
1,954

 
 
 
 
Provision for warranties
1,036

 
787

 
 
 
 
Claims made
(937
)
 
(907
)
 
 
 


Balance as of September 30,
$
1,849

 
$
1,834