Share Based Compensation (Details) - $ / shares |
3 Months Ended | 9 Months Ended | |
|---|---|---|---|
Sep. 30, 2019 |
Sep. 30, 2019 |
Sep. 30, 2018 |
|
| Restricted shares | |||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||
| Total number of restricted shares granted | 196,476 | 1,192,145 | 1,904,595 |
| Estimated fair value (in dollars per share) | $ 16.27 | $ 13.81 | |
| Vested (in shares) | 3,660 | 212,929 | 209,765 |
| Restricted shares | Vesting based on time | |||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||
| Total number of restricted shares granted | 192,816 | ||
| Vesting period from grant date | 3 years | ||
| Stock options | |||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||
| Granted (in shares) | 31,178 | 359,618 | |
| Stock options | Vesting based on time | |||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||
| Granted (in shares) | 31,178 | ||
| Vesting period from grant date | 3 years | ||