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Guarantees
3 Months Ended
Mar. 31, 2019
Guarantees [Abstract]  
Guarantees Guarantees

We provide warranties on certain of our products at the time of sale and sell extended warranties. The standard warranty period for our capital equipment is generally 1 year and our extended warranties typically vary from one to three years. Liability under service and warranty policies is based upon a review of historical warranty and service claim experience. Adjustments are made to accruals as claim data and historical experience warrant.

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


 
Costs associated with extended warranty repairs are recorded as incurred and amounted to $1.4 million and $1.3 million for the three months ended March 31, 2019 and 2018, respectively.