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Non-operating income Non-operating income (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 28, 2019
Sep. 29, 2018
Sep. 28, 2019
Sep. 29, 2018
Nonoperating Income (Expense) [Abstract]        
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
Non-operating income $ 2,723 $ 1,028 $ 10,138 $ 4,080