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Restructuring Costs (Tables)
9 Months Ended
Sep. 28, 2013
Restructuring and Related Activities [Abstract]  
Schedule of Severance and Retention Costs
The following table rolls forward our severance and retention cost liability:
 
Nine Months Ended
 
September 28, 2013
 
September 29, 2012
Balance, beginning of period
$
3,636

 
$
3,374

Expense
1,058

 
1,881

Payments/utilization
(2,084
)
 
(1,415
)
Balance, end of period
$
2,610

 
$
3,840


The following table presents severance and retention costs by classification on the income statement:
 
Nine Months Ended
 
September 28, 2013
 
September 29, 2012
Severance charges included in cost of sales
$
989

 
$
936

Severance charges included in selling, general and administrative expense
69

 
945

Total expense
$
1,058

 
$
1,881


The following table presents severance and retention cost by segment:
 
Nine Months Ended
 
September 28, 2013
 
September 29, 2012
Research models and services
$
811

 
$
934

Preclinical services
247

 
947

Total expense
$
1,058

 
$
1,881