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Share-Based Compensation - Allocation of compensation expenses and related tax effects from the RSUs granted to employees (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure Of Share Based Payment Arrangements Explanatory [Line Items]      
Cost of revenues $ 666,501 $ 533,916 $ 554,690
Research and development 122,265 114,859 123,037
General and administrative 23,915 23,672 21,823
Sales and marketing 16,675 17,628 20,380
Income tax benefit 11,712 416 994
Restricted stock units [Member]      
Disclosure Of Share Based Payment Arrangements Explanatory [Line Items]      
Cost of revenues 70   56
Research and development 3,924 86 3,104
General and administrative 319 26 373
Sales and marketing 520 19 538
Total compensation from RSUs 4,833 131 4,071
Income tax benefit $ 1,044 $ 30 $ 894