Stock-Based Compensation - Performance Stock Units Outstanding Activity (Details) - Performance stock units |
9 Months Ended |
|---|---|
|
Sep. 30, 2017
$ / shares
shares
| |
| Awards | |
| Outstanding, beginning of period (in shares) | shares | 0 |
| Vested (in shares) | shares | 0 |
| Granted (in shares) | shares | 193,391 |
| Forfeited (in shares) | shares | 0 |
| Outstanding, end of period (in shares) | shares | 193,391 |
| Weighted Average Grant-Date Fair Value | |
| Outstanding, beginning of period (in dollars per share) | $ / shares | $ 0.00 |
| Vested (in dollars per share) | $ / shares | 0.00 |
| Granted (in dollars per share) | $ / shares | 21.53 |
| Forfeited (in dollar per share) | $ / shares | 0.00 |
| Outstanding, end of period (in dollars per share) | $ / shares | $ 21.53 |