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 one 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 year ended December 31, are as follows:



	2018			2017			2016
Balance as of January 1,	$	1,750		$	1,954		$	2,509

Provision for warranties	1,099			1,034			610
Claims made	(1,264		)	(1,238		)	(1,165		)

Balance as of December 31,	$	1,585		$	1,750		$	1,954

Costs associated with extended warranty repairs are recorded as incurred and amounted to $4.9 million, $4.6 million and $4.1 million for the years ended December 31, 2018, 2017 and 2016 respectively.