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Accrued Liabilities
 3 Months Ended
Mar. 28, 2020
Payables and Accruals [Abstract]  
Accrued Liabilities Accrued Liabilities
Accrued liabilities consisted of the following (in thousands):
March 28,
2020		December 28,
2019
Accrued compensation and benefits$18,435  $21,329  
Accrued income and other taxes4,519  6,846  
Accrued warranty1,918  1,942  
Accrued employee stock purchase plan contributions withheld1,585  3,331  
Other accrued expenses2,718  2,991  
$29,175  $36,439