Employee Benefit Plans - Restricted Stock Activity (Details) - USD ($) $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2018 |
Dec. 31, 2017 |
Dec. 31, 2016 |
|
| Employee Benefit Plans | |||
| Compensation cost | $ 7,400 | $ 9,000 | $ 9,000 |
| Restricted stock | |||
| Employee Benefit Plans | |||
| Compensation cost | 966 | 335 | 88 |
| Unrecognized compensation cost | $ 3,900 | $ 208 | $ 43 |
| Period for recognition | 3 years | ||
| Shares | |||
| Unvested restricted stock, beginning balance (in shares) | 234,744 | ||
| Granted (in shares) | 2,347,347 | ||
| Vested (in shares) | (234,744) | ||
| Unvested restricted stock, end balance (in shares) | 2,347,347 | 234,744 | |
| Aggregate Intrinsic Value | |||
| Unvested restricted stock aggregate intrinsic value | $ 2,911 | ||
| Restricted stock | Minimum | |||
| Employee Benefit Plans | |||
| Vesting period | 1 year | ||
| Restricted stock | Maximum | |||
| Employee Benefit Plans | |||
| Vesting period | 3 years | ||