Share Based Compensation - Restricted Stock Awards (Details) - Restricted shares - $ / shares |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jan. 01, 2018 |
Jun. 30, 2018 |
Jun. 30, 2018 |
Jun. 30, 2017 |
|
| Avg wtd grant-date fair value | ||||
| Unvested at beginning of period | $ 11.82 | $ 11.82 | $ 9.48 | |
| Granted | 14.24 | 13.51 | ||
| Vested | 11.96 | 7.99 | ||
| Forfeited | 5.71 | |||
| Unvested at end of period | $ 13.20 | $ 13.20 | $ 10.82 | |
| Units | ||||
| Unvested at beginning of period | 1,293,107 | 1,293,107 | 1,018,228 | |
| Granted (in shares) | 1,694,941 | 502,981 | ||
| Vested (in shares) | (33,028) | (8,409) | ||
| Forfeited (in shares) | (2,803) | |||
| Unvested at end of period | 2,955,020 | 2,955,020 | 1,509,997 | |
| 2013 Plan | ||||
| Units | ||||
| Granted (in shares) | 1,678,743 | |||
| 2018 Plan | ||||
| Units | ||||
| Granted (in shares) | 16,198 | 16,198 | ||
| Director Plan | ||||
| Avg wtd grant-date fair value | ||||
| Unvested at beginning of period | $ 5.71 | |||
| Vested | 5.71 | |||
| Unvested at end of period | $ 5.71 | |||
| Units | ||||
| Unvested at beginning of period | 49,230 | |||
| Vested (in shares) | (32,937) | |||
| Unvested at end of period | 16,293 | |||