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Guarantees (Tables)
 3 Months Ended
Mar. 31, 2019
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 three months ended March 31, are as follows:
 
2019
 
2018
Balance as of January 1,
$
1,585

 
$
1,750

 
 
 
 
Provision for warranties
486

 
323

Claims made
(343
)
 
(290
)
 
 
 


Balance as of March 31,
$
1,728

 
$
1,783