Share Based Compensation - Restricted Stock Awards (Details) - Restricted shares - $ / shares |
3 Months Ended | 6 Months Ended | |
|---|---|---|---|
Jun. 30, 2019 |
Jun. 30, 2019 |
Jun. 30, 2018 |
|
| Avg wtd grant-date fair value | |||
| Unvested at beginning of period | $ 13.17 | $ 11.82 | |
| Granted | $ 17.17 | 16.02 | 14.24 |
| Vested | 13.41 | 11.96 | |
| Forfeited | 14.02 | ||
| Unvested at end of period | $ 13.87 | $ 13.87 | $ 13.20 |
| Units | |||
| Unvested at beginning of period | 2,997,856 | 1,293,107 | |
| Granted (in shares) | 477,284 | 995,669 | 1,694,941 |
| Vested (in shares) | (4,360) | (43,996) | (33,028) |
| Forfeited (in shares) | (367,998) | ||
| Unvested at end of period | 3,581,531 | 3,581,531 | 2,955,020 |