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Non-operating income Non-operating income (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 29, 2019
Jun. 30, 2018
Jun. 29, 2019
Jun. 30, 2018
Nonoperating Income (Expense) [Abstract]        
Interest income $ 3,609 $ 1,789 $ 7,042 $ 2,922
Interest expense (80) (60) (161) (687)
Realized and unrealized foreign currency gain (loss) 6 (566) 541 547
Other (6) 242 (7) 270
Non-operating income $ 3,529 $ 1,405 $ 7,415 $ 3,052