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Product Warranties
 6 Months Ended
Jun. 30, 2015
Product Warranties Disclosures [Abstract]  
Product Warranties
Product Warranties

Our standard warranty provides that if our systems do not function to published specifications, we will repair or replace the defective component, system or firmware without charge generally for a period of approximately three years. We generally extend to our customers the warranties provided to us by our suppliers, and accordingly, the majority of our warranty obligations to customers are typically intended to be covered by corresponding supplier warranties. For warranty costs not covered by our suppliers, we provide for estimated warranty costs in the period the revenue is recognized. There can be no assurance that our suppliers will continue to provide such warranties to us in the future or that our warranty obligations to our customers will be covered by corresponding warranties from our suppliers, the absence of which could have a material effect on our financial statements. Estimated liabilities for product warranties are included in accrued expenses.

Our warranty accrual and cost activity is as follows (in thousands):
 
Three Months Ended
 
Six Months Ended
 
June 30,
 
June 30,
 
2014
 
2015
 
2014
 
2015
Balance, beginning of period
$
3,244

 
$
3,469

 
$
2,965

 
$
3,363

Charges to operations
412

 
447

 
826

 
789

Deductions for payments made
(175
)
 
(318
)
 
(350
)
 
(704
)
Changes in estimates
(118
)
 
(382
)
 
(78
)
 
(232
)
Balance, end of period
$
3,363

 
$
3,216

 
$
3,363

 
$
3,216