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Non-operating income Non-operating income (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 28, 2020
Mar. 30, 2019
Nonoperating Income (Expense) [Abstract]    
Interest income $ 2,844 $ 3,433
Realized and unrealized foreign currency gains 588 534
Interest expense (84) (80)
Other (2) (1)
Non-operating income $ 3,346 $ 3,886