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Guarantees (Tables)
 6 Months Ended
Jun. 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 six months ended June 30, are as follows:
 
2018
 
2017
Balance as of January 1,
$
1,750

 
$
1,954

 
 
 
 
Provision for warranties
678

 
442

 
 
 
 
Claims made
(611
)
 
(521
)
 
 
 


Balance as of June 30,
$
1,817

 
$
1,875