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CONSOLIDATED STATEMENTS OF CASH FLOWS
¥ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2018
CNY (¥)
Dec. 31, 2017
CNY (¥)
Dec. 31, 2016
CNY (¥)
Cash flows from operating activities:        
Net income $ 310,301 ¥ 2,133,472 ¥ 1,892,433 ¥ 1,992,767
Adjustments to reconcile net income to net cash by operating activities:        
Provision for allowance for doubtful accounts 25,512 175,405 130,862 57,743
Inventory write-down 64,115 440,823 206,733 303,233
Depreciation of property and equipment 112,034 770,290 720,840 610,976
Amortization of intangible assets 6,958 47,842 340,816 363,977
Amortization of land use rights 10,414 71,601 55,545 37,657
Gains (losses) on disposal of property and equipment and other assets 111 762 (4,170) 10,499
Share-based compensation expenses 97,623 671,210 667,098 475,653
Share of loss of equity method investees 6,836 46,999 22,280 71,489
Impairment loss of other investments 2,919 20,073 133,026 114,574
Unrealized gains on short term investments (7,069) (48,604) (16,934) (31,855)
Amortization of debt issuance costs     5,950 35,824
Gain on disposal or revaluation of investments (27,902) (191,842) (55,615)  
Changes in operating assets and liabilities:        
Accounts receivable (9,444) (64,931) (2,655,862) (1,951,397)
Amounts due from related parties (1,059) (7,284) (1,839) 30,251
Other receivables and prepayments 18,095 124,418 (1,265,051) (323,182)
Inventories 42,438 291,781 (2,240,420) (685,018)
Deferred tax assets (15,076) (103,658) (70,297) (10,119)
Accounts payable (20,471) (140,746) 3,217,304 1,553,400
Advances from customers (127,106) (873,914) (347,538) 690,402
Accrued expenses and other current liabilities 288,805 1,985,677 290,818 (305,221)
Amounts due to related parties 37,537 258,086 12,293 (186,533)
Deferred income 21,865 150,335 26,554 55,549
Deferred tax liability (1,752) (12,047) (83,575) (79,256)
Net cash generated from operating activities 835,684 5,745,748 981,251 2,831,413
Cash flows from investing activities:        
Purchases of property and equipment (366,471) (2,519,673) (2,197,773) (1,967,645)
Purchases of land use rights (156,115) (1,073,370) (275,810) (199,642)
Government subsidies received for land use rights 7,607 52,300 117,825 240,069
Deposits paid for acquisition of land use rights       (618,219)
Proceed from disposal of property and equipment and other assets 718 4,936 9,290 13,385
Purchases of other assets (133) (917) (867) (5,121)
Purchases of short term investments (391,394) (2,691,032) (354,000) (2,165,000)
Redemption of short term investments upon maturities 108,758 747,766 796,729 3,332,482
Investment in equity method investees and other investments (140,164) (963,699) (16,783) (155,641)
Acquisition of subsidiaries, net of cash acquired of RMB19,490 , RMB174 and nil in 2016, 2017 and 2018, respectively     (4,701) (106,365)
Deposits for investment in equity method investees and other investments     (240,000)  
Disposal of an available-for-sale investment     279,295  
Cash paid for loan originations (111,122) (764,020) (188,960) (46,305)
Cash received from loan repayments 75,561 519,519 46,149  
Other investing activities (820) (5,622) (3,000) 9,000
Net cash used in investing activities (973,575) (6,693,812) (2,032,606) (1,669,002)
Cash flows from financing activities:        
Proceeds from bank and other borrowings 307,655 2,115,285 910,310 3,000
Repayment of bank and other borrowings (246,656) (1,695,885) (3,000) (98,000)
Capital contributions from non-controlling interests 145 1,000   1,380
Acquisition of non-controlling interests (2,719) (18,699) (25,855) (111,636)
Partial redemption of convertible senior notes     (21,697)  
Repurchase of ordinary shares       (193,619)
Proceeds from issuance of securitization debt 140,935 969,000 760,000  
Repayment of securitization debt (110,537) (760,000)    
Proceeds from issuance of ordinary shares to new investors     5,610,337  
Proceeds from issuance of ordinary shares upon exercise of share options 574 3,947 5,969 5,747
Deferred settlement of acquisition of subsidiaries (4,026) (27,680) (64,990)  
Other financing activities     (1,250)  
Net cash (used in) provided by financing activities 85,371 586,968 7,169,824 (393,128)
Effect of exchange rate changes on cash, cash equivalents and restricted cash 25,828 177,576 (6,054) 15,910
Net increase (decrease) in cash, cash equivalents and restricted cash (26,692) (183,520) 6,112,415 785,193
Cash, cash equivalents and restricted cash at beginning of the period 1,486,727 10,221,992 4,109,577 3,324,384
Cash, cash equivalents and restricted cash at end of the period 1,460,035 10,038,472 10,221,992 4,109,577
Reconciliation in amounts on the consolidated balance sheets:        
Total cash, cash equivalents and restricted cash at end of the period 1,486,727 10,221,992 4,109,577 3,324,384
Supplemental disclosures of cash flow information:        
Interest paid, net of amount capitalized 23,234 159,744 82,435 85,195
Income tax paid 139,087 956,291 948,915 631,129
Supplemental disclosure of non-cash investing and financing activities:        
Payables incurred for purchase of property and equipment $ 673 ¥ 4,626 ¥ 9,971 271,999
Payables for acquisition of subsidiaries       ¥ 74,352