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Non-operating income Non-operating income (Tables)
3 Months Ended
Mar. 30, 2019
Nonoperating Income (Expense) [Abstract]  
Schedule of Other Nonoperating Income (Expense)
Non-operating income consists of the following (in thousands):
 
March 30,
2019
 
March 31,
2018
Interest income
$
3,433

 
$
1,133

Realized and unrealized foreign currency gain
534

 
1,113

Interest expense
(80
)
 
(627
)
Other
(1
)
 
28

Total
$
3,886

 
$
1,647