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Guarantees
12 Months Ended
Dec. 31, 2015
Guarantees [Abstract]  
Guarantees
Guarantees

We provide warranties on certain of our products at the time of sale.  The standard warranty period for our capital and reusable equipment is generally one year.  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 warranties for the year ended December 31, are as follows:

 
2015
 
2014
 
2013
 
 
 
 
 
 
Balance as of January 1,
$
2,286

 
$
2,422

 
$
3,636

 
 
 
 
 
 
Provision for warranties
3,836

 
3,492

 
3,061

Claims made
(3,613
)
 
(3,628
)
 
(4,275
)
 
 
 
 
 
 
Balance as of December 31,
$
2,509

 
$
2,286

 
$
2,422