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Non-operating income Non-operating income (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 30, 2019
Mar. 31, 2018
Nonoperating Income (Expense) [Abstract]    
Interest income $ 3,433 $ 1,133
Realized and unrealized foreign currency gain 534 1,113
Interest expense (80) (627)
Other 1 28
Non-operating income $ 3,886 $ 1,647