Stock-Based Compensation - Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions |
3 Months Ended |
|
Mar. 31, 2018 |
Mar. 31, 2017 |
Oct. 07, 2016 |
| Restricted stock awards |
|
|
|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
|
|
| Granted (in dollars per share) |
$ 19.00
|
$ 18.82
|
|
| Fair value of vested restricted stock awards |
$ 1.2
|
|
|
| Unrecognized compensation costs |
$ 16.6
|
|
|
| Unrecognized compensation costs, period for recognition |
2 years 2 months 12 days
|
|
|
| Stock option awards |
|
|
|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
|
|
| Unrecognized compensation costs, period for recognition |
1 year 9 months 7 days
|
|
|
| Unrecognized compensation costs |
$ 16.6
|
|
|
| Performance stock units |
|
|
|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
|
|
| Unrecognized compensation costs |
$ 3.2
|
|
|
| Unrecognized compensation costs, period for recognition |
2 years 3 months
|
|
|
| 2016 Long Term Incentive Plan |
|
|
|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
|
|
| Number of shares authorized (in shares) |
|
|
16,500,000
|
| Number of shares available for grant (in shares) |
10,691,760
|
|
|
| 2016 Long Term Incentive Plan | Stock option awards |
|
|
|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
|
|
| Vesting period |
3 years
|
|
|
| Option expiration period |
10 years
|
|
|
| Officer and employees | Restricted stock awards |
|
|
|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
|
|
| Vesting period |
3 years
|
|
|
| Director | Restricted stock awards |
|
|
|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
|
|
| Vesting period |
1 year
|
|
|