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Share-based Compensation (Details 2) - CNY (¥) ¥ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Share-based compensation cost |  |  |
Number of preceding years considered for estimating forfeiture | 5 years |  |
Share-based Compensation Expense | ¥ 2,663,489 | ¥ 2,404,089 | ¥ 2,471,731
Cost of revenues |  |  |
Share-based compensation cost |  |  |
Share-based Compensation Expense | 794,855 | 758,810 | 757,341
Selling and marketing expenses |  |  |
Share-based compensation cost |  |  |
Share-based Compensation Expense | 102,300 | 84,920 | 102,638
General and administrative expenses |  |  |
Share-based compensation cost |  |  |
Share-based Compensation Expense | 929,013 | 797,120 | 787,200
Research and development expenses |  |  |
Share-based compensation cost |  |  |
Share-based Compensation Expense | ¥ 837,321 | ¥ 763,239 | ¥ 824,552

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