Commitments and Contingent Liabilities

Guarantees:

Standby letters of credit were issued to lessors and insurance institutions and can only be drawn upon in the event of our failure to pay our obligations to a beneficiary. As of September 30, 2019, we had a maximum financial exposure from unused standby letters of credit totaling $1.5 million.

We are periodically required to provide performance bonds in order to conduct business with certain customers. The bonds are required to provide assurances to customers that the products and services they have purchased will be installed and/or provided properly and without damage to their facilities. We are ultimately liable for claims that may occur against the performance bonds. We had a maximum financial exposure from one performance bond totaling $5.1 million as of September 30, 2019.

We are not aware of circumstances that would require us to perform under these arrangements and believe that the resolution of any claims that might arise in the future, either individually or in the aggregate, would not materially affect our condensed consolidated financial statements. Accordingly, no liability has been recorded as of September 30, 2019 with respect to the standby letters of credit. We also enter into commercial letters of credit to facilitate payments to vendors and from customers.

Product Warranties:

We provide an assurance-type warranty that guarantees our product complies with agreed-upon specifications. This warranty is not sold separately and does not convey any additional services to the customer. We estimate product warranty liability at the time of sale based on historical repair or replacement cost trends in conjunction with the length of the warranty offered. Management refines the warranty liability periodically based on changes in historical cost trends and in certain cases where specific warranty issues become known.

Changes in the product warranty accrual for the three months ended September 30, 2019 and 2018 were as follows:



	Three Months Ended
	September 30
(Amounts in Thousands)	2019			2018
Product Warranty Liability at the beginning of the period	$	2,238		$	2,294
Additions to warranty accrual (including changes in estimates)	278			343
Settlements made (in cash or in kind)	(370		)	(318		)
Product Warranty Liability at the end of the period	$	2,146		$	2,319