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Restructuring and Contract Termination Costs (Tables)
6 Months Ended
Jun. 30, 2012
Restructuring and Related Activities [Abstract]  
Schedule of Severance and Retention Costs
The following table rolls forward our severance and retention cost liability:
 
Six Months Ended
 
June 30, 2012
 
June 25, 2011
Balance, beginning of period
$
3,374

 
$
10,658

Expense
911

 
1,392

Payments/utilization
(1,233
)
 
(6,065
)
Balance, end of period
$
3,052

 
$
5,985


The following table presents severance and retention costs by classification on the income statement:
 
Six Months Ended
 
June 30, 2012
 
June 25, 2011
Severance charges included in cost of sales
$

 
$
431

Severance charges included in selling, general and administrative expense
911

 
961

Total expense
$
911

 
$
1,392

The following table presents severance and retention cost by segment:
 
Six Months Ended
 
June 30, 2012
 
June 25, 2011
Research models and services
$

 
$
408

Preclinical services
911

 
984

Corporate

 

Total expense
$
911

 
$
1,392