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Net Income per Share | 12 Months Ended
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Dec. 31, 2019
Net Income per Share |
Net Income per Share | 3. Net Income per Share The following table sets forth the computation of basic and diluted net income per share attributable to ordinary shareholders: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Years Ended December 31,
​ | ​ | (Amount in Thousands, Except Shares Data)
​ |  | 2017 |  | 2018 |  | 2019 |  | 2019
​ | ​ | Class A and Class B | ​ | Class A and Class B | ​ | Class A and Class B | ​ | Class A and Class B
​ | ​ | RMB | ​ | RMB | ​ | RMB | ​ | US$
Net income attributable to Class A and Class B ordinary shareholders—basic |  | 762,923 |  | 811,297 |  | 829,151 | ​ | 119,098
Plus: interest expense for convertible notes |  | 20,042 |  | 7,707 |  | 679 | ​ | 98
Net income attributable to Class A and Class B ordinary shareholders—diluted |  | 782,965 |  | 819,004 |  | 829,830 | ​ | 119,196
Weighted average number of Class A and Class B ordinary shares outstanding—basic |  | 28,275,637 |  | 29,288,401 |  | 30,580,181 | ​ | 30,580,181
Plus: share options |  | 189,508 |  | 347,703 |  | 244,806 | ​ | 244,806
Plus: non-vested restricted shares |  | 73,337 |  | 26,308 |  | 36,385 | ​ | 36,385
Plus: shares outstanding for convertible notes |  | 1,695,341 |  | 1,048,128 |  | 62,723 | ​ | 62,723
Weighted average number of Class A and Class B ordinary shares outstanding—diluted |  | 30,233,823 |  | 30,710,540 |  | 30,924,095 | ​ | 30,924,095
Basic net income per share |  | 26.98 |  | 27.70 |  | 27.12 | ​ | 3.90
Diluted net income per share |  | 25.90 |  | 26.67 |  | 26.84 | ​ | 3.86
​ In January 2016, the Company’s shareholders voted in favor of a proposal to adopt a dual-class share structure, pursuant to which authorized share capital was reclassified and re-designated into Class A ordinary shares and Class B ordinary shares, with each Class A ordinary share being entitled to one vote and each Class B ordinary share being entitled to four votes on all matters that are subject to shareholder vote. As economic rights and obligations are applied equally to both Class A and Class B ordinary shares, earnings are allocated between the two classes of ordinary shares evenly with the same allocation on a per share basis. Diluted net income per share does not include the following instruments as their inclusion would be antidilutive: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Years Ended December 31,
​ |  | 2017 |  | 2018 |  | 2019
Share options |  | 243,561 |  | 168,203 |  | 72,929
Non-vested restricted shares |  | — |  | 150,897 |  | 91,550
Total |  | 243,561 |  | 319,100 |  | 164,479
​

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 + Details
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