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Guarantees (Tables)
 6 Months Ended
Jun. 28, 2014
Guarantees [Abstract]  
Activity Related to Product Warranty
Activity related to product warranty was as follows (in thousands): 
 
Three Months Ended
 
Six Months Ended
 
June 28, 2014
 
June 29, 2013
 
June 28, 2014
 
June 29, 2013
Beginning balance
$
26,385

 
$
16,672

 
$
22,908

 
$
16,482

Charges to operations
6,800

 
6,178

 
12,360

 
10,346

Utilization
(2,370
)
 
(2,055
)
 
(5,612
)
 
(4,138
)
Change in estimate (1)
(2,867
)
 
(1,094
)
 
(1,708
)
 
(2,989
)
Balance at the end of the period
$
27,948

 
$
19,701

 
$
27,948

 
$
19,701

 _________________
(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 resulting impact of these changes on the Company’s estimate of expected future returns, as well as changes in the estimated cost and the mix of new versus used units related to replacement of failed units.