Stock-Based Compensation (Tables)
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12 Months Ended |
Dec. 31, 2018 |
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| Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
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| Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan |
The following table summarizes stock-based compensation expense recognized for the periods presented: | | | | | | | | | | | | | | Year Ended December 31, | | October 11, 2016
through
December 31, 2016 | (in thousands) | 2018 | | 2017 | | Restricted stock awards | $ | 9,185 |
| | $ | 5,008 |
| | $ | 405 |
| Stock option awards | 9,433 |
| | 8,160 |
| | 928 |
| Performance stock units | 2,052 |
| | 591 |
| | — |
| Total stock-based compensation expense | $ | 20,670 |
| | $ | 13,759 |
| | $ | 1,333 |
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| Nonvested Restricted Stock Shares Activity |
The following table provides a summary of the restricted stock activity during the year ended December 31, 2018: | | | | | | | | | Awards | | Weighted Average Grant-Date Fair Value | Unvested balance as of December 31, 2017 | 1,009,716 |
| | $ | 17.64 |
| Granted | 1,029,721 |
| | 18.11 |
| Vested | (367,441 | ) | | 17.93 |
| Forfeited | (136,051 | ) | | 17.70 |
| Unvested balance as of December 31, 2018 | 1,535,945 |
| | 17.88 |
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| Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions |
The following table summarizes the assumptions and related information used to determine the grant-date fair value of stock options awarded for the periods presented: | | | | | | | | | | | | | | Year Ended December 31, | | October 11, 2016 through December 31, 2016 | | 2018 | | 2017 | | Weighted average grant-date fair value per share | $ | 8.58 |
| | $ | 7.15 |
| | $ | 5.93 |
| Expected term (in years) | 6 |
| | 6 |
| | 6 |
| Expected stock volatility | 42 | % | | 38 | % | | 40 | % | Dividend yield | — |
| | — |
| | — |
| Risk-free interest rate | 2.7 | % | | 2.0 | % | | 1.5 | % |
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| Schedule of Share-based Compensation, Stock Options, Activity |
The following table provides information about stock option awards outstanding during the year ended December 31, 2018: | | | | | | | | | | | | | | | Options | | Weighted Average Exercise Price | | Weighted Average Remaining Term (in years) | | Aggregate Intrinsic Value (in thousands) | Outstanding as of December 31, 2017 | 4,290,001 |
| | $ | 16.15 |
| | | | | Granted | 567,500 |
| | 19.29 |
| | | | | Exercised | (59,831 | ) | | 16.43 |
| | | | | Forfeited | (233,504 | ) | | 15.85 |
| | | | | Expired | (4,832 | ) | | 16.79 |
| | | | | Outstanding as of December 31, 2018 | 4,559,334 |
| | 16.55 |
| | 8.2 | | $ | — |
| Exercisable as of December 31, 2018 | 2,058,970 |
| | 15.63 |
| | 8.0 | | $ | — |
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| Schedule of Share-based Payment Award, Equity Instruments Other Than Options, Valuation Assumptions |
The following table summarizes the key assumptions and related information used to determine the grant-date fair value of performance stock units awarded during the periods presented: | | | | | | | | | | Year Ended December 31, | | 2018 | | 2017 | Number of simulations | 1,000,000 |
| | 1,000,000 |
| Expected stock volatility | 40.2 | % | | 41.6 | % | Dividend yield | — | % | | — | % | Risk-free interest rate | 2.8 | % | | 1.5 | % | Weighted average grant-date fair value per unit | $ | 22.35 |
| | $ | 21.53 |
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| Share-based Compensation, Performance Shares Award Outstanding Activity |
The following table provides information about performance stock units outstanding during the year ended December 31, 2018: | | | | | | | | | Awards | | Weighted Average Grant-Date Fair Value | Unvested balance as of December 31, 2017 | 193,391 |
| | $ | 21.53 |
| Granted | 193,068 |
| | 22.35 |
| Vested | — |
| | — |
| Forfeited | — |
| | — |
| Unvested balance as of December 31, 2018 | 386,459 |
| | 21.94 |
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