Stock-Based Compensation (Tables)
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3 Months Ended |
Mar. 31, 2018 |
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| Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
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| Schedule of Compensation Expense |
Upon adoption of ASU 2016-09 in October 2016, the Company elected to account for forfeitures of awards granted under the LTIP as they occur in determining compensation expense. | | | | | | | | | | For the Three Months Ended March 31, | (in thousands) | 2018 | | 2017 | Restricted stock awards | $ | 1,775 |
| | $ | 856 |
| Stock option awards | 2,206 |
| | 1,754 |
| Performance stock units | 352 |
| | — |
| Total stock-based compensation expense | $ | 4,333 |
| | $ | 2,610 |
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| Nonvested Restricted Stock Shares Activity |
The following table provides information about restricted stock awards outstanding during the three months ended March 31, 2018: | | | | | | | | | Awards | | Weighted Average Grant Date Fair Value | Unvested balance as of December 31, 2017 | 1,009,716 |
| | $ | 17.64 |
| Granted | 199,320 |
| | $ | 19.00 |
| Vested | (63,367 | ) | | $ | 18.50 |
| Forfeited | (25,948 | ) | | $ | 16.85 |
| Unvested balance as of March 31, 2018 | 1,119,721 |
| | $ | 17.85 |
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| Summary of Stock Option Valuation Inputs |
The following table summarizes the assumptions and related information used to determine the grant-date fair value of stock options awarded during the three months ended March 31, 2018: | | | | | | | | | For the Three Months Ended March 31, | | 2018 | | 2017 | Weighted average grant-date fair value per share | $ | 7.96 |
| | 7.21 |
| Expected term (in years) | 6 |
| | 6 |
| Expected stock volatility | 37 | % | | 38.2 | % | Dividend yield | — | % | | — | % | Risk-free interest rate | 2.3 | % | | 2.0 | % |
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| Summary of Stock Option Activity |
The following table provides information about stock option awards outstanding during the three months ended March 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 | 37,000 |
| | $ | 20.00 |
| | | | | Exercised | (10,000 | ) | | $ | 16.43 |
| | | | | Forfeited | (47,668 | ) | | $ | 14.95 |
| | | | | Outstanding as of March 31, 2018 | 4,269,333 |
| | $ | 16.20 |
| | 8.78 | | $ | 9,417 |
| Exercisable as of March 31, 2018 | 1,211,612 |
| | $ | 15.83 |
| | 8.69 | | $ | 2,911 |
| Unvested Options at March 31, 2018 | 3,057,721 |
| | $ | 16.28 |
| | 8.81 | | $ | 6,506 |
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