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Net Income per Share (Tables) | 12 Months Ended
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Dec. 31, 2019
Net Income per Share |
Schedule of computation of basic and diluted net income per share attributable to ordinary shareholders | 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
Schedule of antidilutive net income per share | 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 Tabular disclosure of securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) in the future that were not included in the computation of diluted EPS because to do so would increase EPS amounts or decrease loss per share amounts for the period presented, by antidilutive securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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