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Non-operating income Non-operating income (Tables)
 6 Months Ended
Jun. 27, 2020
Nonoperating Income (Expense) [Abstract]  
Schedule of Other Nonoperating Income (Expense)
Non-operating income consists of the following (in thousands):
 
Three Months Ended
 
Six Months Ended
 
June 27,
2020
 
June 29,
2019
 
June 27,
2020
 
June 29,
2019
Interest income
$
1,478

 
$
3,609

 
$
4,323

 
$
7,042

Interest expense
(83
)
 
(80
)
 
(167
)
 
(161
)
Realized and unrealized foreign currency gains
11

 
6

 
599

 
541

Other
(1
)
 
(6
)
 
(4
)
 
(7
)
Total
$
1,405

 
$
3,529

 
$
4,751

 
$
7,415