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Non-operating income Non-operating income
 9 Months Ended
Sep. 28, 2019
Nonoperating Income (Expense) [Abstract]  
Non-operating income
19. Non-operating income
Non-operating income consists of the following (in thousands):
 
Three Months Ended
 
Nine Months Ended
 
September 28,
2019
 
September 29,
2018
 
September 28,
2019
 
September 29,
2018
Interest income
$
3,664

 
$
2,326

 
$
10,706

 
$
5,247

Interest expense
(82
)
 
(7
)
 
(243
)
 
(694
)
Realized and unrealized foreign currency loss
(856
)
 
(1,311
)
 
(315
)
 
(764
)
Other
(3
)
 
20

 
(10
)
 
291

Total
$
2,723

 
$
1,028

 
$
10,138

 
$
4,080