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Guarantees (Tables)
 9 Months Ended
Sep. 28, 2013
Guarantees [Abstract]  
Activity Related to Product Warranty
Activity related to product warranty was as follows (in thousands):
 
 
Three Months Ended
 
Nine Months Ended
 
September 28,
2013
 
September 29,
2012
 
September 28,
2013
 
September 29,
2012
Beginning balance
$
19,701

 
$
13,702

 
$
16,482

 
$
12,865

Charges to operations
5,220

 
4,241

 
16,646

 
10,065

Utilization
(2,645
)
 
(1,684
)
 
(6,783
)
 
(5,488
)
Change in estimate (1)
886

 
(960
)
 
(3,183
)
 
(2,143
)
Balance at the end of the period
$
23,162

 
$
15,299

 
$
23,162

 
$
15,299


(1) 
The Company records hardware warranty liabilities based on the latest quality and cost information available as of that date. The changes in estimate shown here are due to changes in overall actual failure rates and the impact of these changes on the Company’s estimate of expected future returns and changes in the estimated cost of replacing failed units using either repaired or new units.