Stock-Based Compensation - Additional Information (Details) - USD ($)
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6 Months Ended |
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Jun. 30, 2018 |
Jun. 30, 2017 |
Oct. 07, 2016 |
| Restricted stock awards |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Weighted average grant-date fair value (in dollars per share) |
$ 18.87
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$ 18.77
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| Fair value of vested restricted stock awards |
$ 1,400,000
|
$ 0
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| Unrecognized compensation costs |
$ 14,700,000
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| Unrecognized compensation costs, period for recognition |
2 years
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| Stock option awards |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Unrecognized compensation costs, period for recognition |
1 year 6 months 26 days
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| Unrecognized compensation costs |
$ 15,300,000
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| Performance stock units |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Unrecognized compensation costs |
$ 2,900,000
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| Unrecognized compensation costs, period for recognition |
2 years
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| 2016 Long Term Incentive Plan |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Number of shares authorized (in shares) |
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16,500,000
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| Number of shares available for grant (in shares) |
10,559,339
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| 2016 Long Term Incentive Plan | Stock option awards |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Vesting period |
3 years
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| Option expiration period |
10 years
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| Officer and employees | Restricted stock awards |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Vesting period |
3 years
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| Director | Restricted stock awards |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Vesting period |
1 year
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