Share Based Compensation - Restricted Stock Awards (Details) - Restricted shares - $ / shares |
3 Months Ended | 9 Months Ended | |
|---|---|---|---|
Sep. 30, 2019 |
Sep. 30, 2019 |
Sep. 30, 2018 |
|
| Avg wtd grant-date fair value | |||
| Unvested at beginning of period | $ 13.17 | $ 11.82 | |
| Granted | 16.27 | 13.81 | |
| Vested | 11.06 | 10.48 | |
| Forfeited | 13.49 | ||
| Unvested at end of period | $ 14.25 | $ 14.25 | $ 13.18 |
| Units | |||
| Unvested at beginning of period | 2,997,856 | 1,293,107 | |
| Granted (in shares) | 196,476 | 1,192,145 | 1,904,595 |
| Vested (in shares) | (3,660) | (212,929) | (209,765) |
| Forfeited (in shares) | (433,549) | ||
| Unvested at end of period | 3,543,523 | 3,543,523 | 2,987,937 |