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Employee benefits - Cash award expenses related to tax effects (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 28, 2021
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
cash award expenses included in applicable costs of revenues and expense categories and related tax effects        
Cost of revenues   $ 798,519 $ 666,501 $ 533,916
Research and development   151,386 122,265 114,859
Sales and marketing   23,080 16,675 17,628
Total compensation recognized in income   146,809 103,357 95,117
Income tax benefit   110,657 $ 11,712 $ 416
Cash Award Expenses        
cash award expenses included in applicable costs of revenues and expense categories and related tax effects        
Cost of revenues   511    
Research and development   5,876    
General and administrative   678    
Sales and marketing   1,223    
Total compensation recognized in income   8,288    
Income tax benefit   $ 1,444    
Total annual bonus cash payouts $ 47,657      
Vested on grant date $ 1,582