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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, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure Of Share Based Payment Arrangements Explanatory [Line Items]      
Cost of revenues $ 533,916 $ 554,690 $ 518,142
Research and development 114,859 123,037 117,662
General and administrative 23,672 21,823 20,461
Sales and marketing 17,628 20,380 20,388
Income tax benefit 416 994 4,554
Restricted stock units [Member]      
Disclosure Of Share Based Payment Arrangements Explanatory [Line Items]      
Cost of revenues   56 112
Research and development 86 3,104 5,097
General and administrative 26 373 686
Sales and marketing 19 538 980
Total compensation from RSUs 131 4,071 6,875
Income tax benefit $ 30 $ 894 $ 1,525