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CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY ¥ in Thousands, $ in Thousands | Class A ordinary shares Ordinary shares CNY (¥) shares | Class A ordinary shares shares | Class B ordinary shares Ordinary shares CNY (¥) shares | Additional paid-in capital CNY (¥) | Treasury Shares CNY (¥) shares | Retained Earnings CNY (¥) | Accumulated other comprehensive income (loss) CNY (¥) | Non-controlling interests CNY (¥) | USD ($) shares | CNY (¥) shares
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2015 | ¥ 65 |  | ¥ 11 | ¥ 2,838,591 | ¥ (844,711) | ¥ 1,616,209 | ¥ (70,981) | ¥ 74,083 |  | ¥ 3,613,267
Balance (in shares) at Dec. 31, 2015 | shares | 100,085,519 |  | 16,510,358 |  | (1,614,135) |  |  |  |  |
Increase (Decrease) in Shareholders' Equity |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  | 2,036,817 |  | (44,050) |  | 1,992,767
Issuance of ordinary shares upon exercise of share options |  |  |  | 5,747 |  |  |  |  |  | ¥ 5,747
Issuance of ordinary shares upon exercise of share options (in shares) | shares | 560,930 | 560,930 |  |  |  |  |  |  | 560,930 | 560,930
Issuance of ordinary shares upon vesting of shares awards | ¥ 1 |  |  | (1) |  |  |  |  |  |
Issuance of ordinary shares upon vesting of shares awards (in shares) | shares | 861,815 | 861,815 |  |  |  |  |  |  |  |
Re-issuance of treasury shares upon vesting of shares awards |  |  |  | (137,270) | ¥ 137,270 |  |  |  |  |
Re-issuance of treasury shares upon vesting of shares awards (in shares) | shares |  |  |  |  | 257,217 |  |  |  | 257,217 | 257,217
Share-based compensation expense |  |  |  | 475,653 |  |  |  |  |  | ¥ 475,653
Non-controlling interests arising from business combinations |  |  |  |  |  |  |  | 73,637 |  | 73,637
Purchase additional ownership interests in a subsidiaries |  |  |  | (52,594) |  |  |  | (59,042) |  | (111,636)
Capital contribution from non-controlling interest shareholders |  |  |  |  |  |  |  | 1,800 |  | 1,800
Foreign currency translation |  |  |  |  |  |  | (292,152) | 3,196 |  | (288,956)
Fair value changes of available-for-sale investments |  |  |  |  |  |  | (17,042) |  |  | (17,042)
Reclassification adjustments for loss (gain) included in net income |  |  |  |  |  |  | 36,567 |  |  | 36,567
Balance at Dec. 31, 2016 | ¥ 66 |  | ¥ 11 | 3,130,126 | ¥ (707,441) | 3,653,026 | (343,608) | 49,624 |  | 5,781,804
Balance (in shares) at Dec. 31, 2016 | shares | 101,508,264 |  | 16,510,358 |  | (1,356,918) |  |  |  |  |
Increase (Decrease) in Shareholders' Equity |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  | 1,949,655 |  | (57,222) |  | ¥ 1,892,433
Issuance of ordinary shares upon exercise of share options (in shares) | shares |  |  |  |  |  |  |  |  | 454,708 | 454,708
Issuance of ordinary shares to new investors | ¥ 8 |  |  | 5,610,329 |  |  |  |  |  | ¥ 5,610,337
Issuance of ordinary shares to new investors (in shares) | shares | 13,184,910 |  |  |  |  |  |  |  |  |
Issuance of ordinary shares upon vesting of shares awards (in shares) | shares | 23,413 | 23,413 |  |  |  |  |  |  |  |
Re-issuance of treasury shares upon exercise of share options |  |  |  | (234,409) | ¥ 240,378 |  |  |  |  | ¥ 5,969
Re-issuance of treasury shares upon exercise of share options (in shares) | shares |  | 454,708 |  |  | 454,708 |  |  |  |  |
Re-issuance of treasury shares upon vesting of shares awards |  |  |  | (467,063) | ¥ 467,063 |  |  |  |  |
Re-issuance of treasury shares upon vesting of shares awards (in shares) | shares |  |  |  |  | 902,210 |  |  |  | 1,356,918 | 1,356,918
Share-based compensation expense |  |  |  | 667,098 |  |  |  |  |  | ¥ 667,098
Purchase additional ownership interests in a subsidiaries |  |  |  | 9,914 |  |  |  | (36,345) |  | (26,431)
Foreign currency translation |  |  |  |  |  |  | 342,348 |  |  | 342,348
Fair value changes of available-for-sale investments |  |  |  |  |  |  | 32,633 |  |  | 32,633
Reclassification adjustments for loss (gain) included in net income |  |  |  |  |  |  | (55,615) |  |  | (55,615)
Balance at Dec. 31, 2017 | ¥ 74 |  | ¥ 11 | 8,715,995 |  | 5,602,681 | (24,242) | (43,943) |  | 14,250,576
Balance (in shares) at Dec. 31, 2017 | shares | 114,716,587 |  | 16,510,358 |  |  |  |  |  |  |
Increase (Decrease) in Shareholders' Equity |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  | 2,128,787 |  | 4,685 | $ 310,301 | 2,133,472
Issuance of ordinary shares upon exercise of share options |  |  |  | 3,947 |  |  |  |  |  | ¥ 3,947
Issuance of ordinary shares upon exercise of share options (in shares) | shares | 356,736 | 356,736 |  |  |  |  |  |  | 356,736 | 356,736
Issuance of ordinary shares upon vesting of shares awards | ¥ 1 |  |  | (1) |  |  |  |  |  |
Issuance of ordinary shares upon vesting of shares awards (in shares) | shares | 1,322,560 | 1,322,560 |  |  |  |  |  |  |  |
Re-issuance of treasury shares upon vesting of shares awards (in shares) | shares |  |  |  |  |  |  |  |  | 0 | 0
Share-based compensation expense |  |  |  | 671,210 |  |  |  |  |  | ¥ 671,210
Purchase additional ownership interests in a subsidiaries |  |  |  | (5,935) |  |  |  | (12,764) |  | (18,699)
Capital contribution from non-controlling interest shareholders |  |  |  |  |  |  |  | 1,000 |  | 1,000
Foreign currency translation |  |  |  |  |  |  | (7,083) |  | $ (1,030) | (7,083)
Balance at Dec. 31, 2018 | ¥ 75 |  | ¥ 11 | ¥ 9,385,216 |  | 7,907,396 | (30,883) | ¥ (51,022) | $ 2,503,208 | 17,210,793
Balance (in shares) at Dec. 31, 2018 | shares | 116,395,883 |  | 16,510,358 |  |  |  |  |  |  |
Increase (Decrease) in Shareholders' Equity |  |  |  |  |  |  |  |  |  |
Adoption of new accounting standards (Note 2) |  |  |  |  |  | ¥ 175,928 | ¥ 442 |  |  | ¥ 176,370

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