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Consolidated Statements of Cash Flows
¥ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2021
CNY (¥)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
CNY (¥)
Dec. 31, 2019
CNY (¥)
CASH FLOWS FROM OPERATING ACTIVITIES        
Net income ¥ 2,143,152 $ 336,307 ¥ 3,407,567 ¥ 3,200,645
Adjustments to reconcile net income to net cash from operating activities:        
Depreciation of property and equipment 225,310 35,356 158,229 106,941
Amortization of intangible assets 83,710 13,136 12,045 11,662
Amortization of operating lease assets 122,144 19,167 108,904 122,427
Loss/(gain) on disposal of property and equipment (1,203) (189) (249) 83
Provision for doubtful accounts 53,294 8,363 95,683 36,676
(Earnings)/loss from equity method investments (301) (47) 1,246 (685)
Fair value change of short-term investments 107,526 16,873 9,042 20,662
Fair value change of other non-current assets     15,658 5,442
Interest income of convertible bond     (77,720) (70,889)
Share-based compensation 206,060 32,335 211,206 204,008
Deferred income taxes (151,188) (23,725) (22,427) 144,963
Changes in operating assets and liabilities:        
Accounts receivable 931,432 146,162 (39,910) (479,538)
Amounts due from related parties, current (36,073) (5,661) (17,802) 4,546
Prepaid expenses and other current assets 1,046 164 (217,720) (50,995)
Amounts due from related parties, non-current 10,634 1,669 (13,654) (2,468)
Other non-current assets 3,177 499 (252,877) (186,591)
Accrued expenses and other payables (432,192) (67,820) (158,270) (22,630)
Advance from customers (3,865) (607) 31,599 20,619
Deferred revenue 237,346 37,245 (55,286) (139,773)
Income tax payable 148,165 23,250 39,688 (73,721)
Amounts due to related parties (47,998) (7,532) 43,508 16,519
Other liabilities (76,242) (11,964) 47,171 21,466
Net cash generated from operating activities 3,523,934 552,981 3,325,631 2,889,369
CASH FLOWS FROM INVESTING ACTIVITIES        
Purchase of property and equipment (218,798) (34,334) (263,892) (204,113)
Proceeds from disposal of property and equipment 1,030 162 388 621
Purchase of intangible assets (810) (127) (573)  
Cash consideration paid for the TTP acquisition, net of cash acquired (77,444) (12,153) (639,760)  
Purchase of short-term investments (27,082,428) (4,249,824) (40,050,012) (42,660,267)
Maturity of short-term investments 23,565,437 3,697,931 37,968,391 41,695,492
Net cash used in investing activities (3,813,013) (598,345) (2,985,458) (1,168,267)
CASH FLOWS FROM FINANCING ACTIVITIES        
Proceeds from exercise of share options 37,032 5,811 104,154 68,676
Payment of dividends (673,375) (105,667) (651,121)  
Proceeds from issuance of ordinary shares 3,565,843 559,559    
Payments for repurchase of ordinary shares (31,204) (4,897)    
Net cash generated from/(used in) financing activities 2,898,296 454,806 (546,967) 68,676
Effect of exchange rate changes on cash and cash equivalents and restricted cash (46,809) (7,345) (17,556) (13,250)
Net increase/(decrease) in cash and cash equivalents and restricted cash 2,562,408 402,097 (224,350) 1,776,528
Cash and cash equivalents and restricted cash at beginning of year 1,769,148 277,618 1,993,498 216,970
Cash and cash equivalents and restricted cash at end of year 4,331,556 679,715 1,769,148 1,993,498
Supplemental disclosures of cash flow information:        
Income taxes paid 340,215 53,387 563,415 430,308
Purchase of fixed assets included in accrued expenses and other payables 18,624 2,923 34,061 20,382
Cash paid for operating lease cost 137,693 21,607 135,773 132,096
Right-of-use assets acquired under operating leases ¥ 38,023 $ 5,967 ¥ 217,668 ¥ 54,315