Stock-Based Compensation - Performance Stock Units Outstanding Activity (Details) - Performance Shares - $ / shares |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2019 |
Dec. 31, 2018 |
Dec. 31, 2017 |
|
| Awards | |||
| Unvested beginning balance (in shares) | 386,459 | ||
| Granted (in shares) | 486,213 | ||
| Vested (in shares) | 0 | ||
| Forfeited (in shares) | 0 | ||
| Unvested ending balance (in shares) | 872,672 | 386,459 | |
| Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] | |||
| Outstanding, beginning of period (in dollars per share) | $ 21.94 | ||
| Granted (in dollars per share) | 6.68 | $ 22.35 | $ 21.53 |
| Vested (in dollars per share) | 0 | ||
| Forfeited | 0 | ||
| Outstanding, end of period (in dollars per share) | $ 13.44 | $ 21.94 | |