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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2019
Share-based Payment Arrangement [Abstract] |
Information on stock options issued | The following table contains information about our stock options:
| Number of Option Shares |  | Weighted-Average Exercise Price |  | Weighted-Average Remaining Contractual Term (in years) |  | Aggregate Intrinsic Value (in millions)
Outstanding as of January 1, 2019 | 5,869,211 |  |  | $ | 15.14 |  |  |  |  |  |
Granted | 2,436,811 |  |  | $ | 19.24 |  |  |  |  |  |
Exercised | (230,644 | ) |  | $ | 14.32 |  |  |  |  |  |
Forfeited | (257,942 | ) |  | $ | 19.44 |  |  |  |  |  |
Outstanding as of December 31, 2019 | 7,817,436 |  |  | $ | 16.30 |  |  | 4.84 |  | $ | 75.1 |
Exercisable as of December 31, 2019 | 4,071,052 |  |  | $ | 13.62 |  |  | 2.49 |  | $ | 49.2 |
Information about stock options by exercise price range | The following table summarizes information about our outstanding stock options as of December 31, 2019:
| Exercise Price Range |  | Total
| $11.61 to $16.93 |  | $17.77 to $25.05 |  | $30.74 to $32.90 |  | $11.61 to $32.90
Outstanding options |  |  |  |  |  |  |
Number outstanding | 4,842,725 |  |  | 2,368,886 |  |  | 605,825 |  |  | 7,817,436 |
Weighted-average remaining contractual term (in years) | 2.66 |  |  | 9.27 |  |  | 4.95 |  |  | 4.84 |
Weighted-average exercise price | $ | 13.06 |  |  | $ | 19.23 |  |  | $ | 30.75 |  |  | $ | 16.30 |
Exercisable options |  |  |  |  |  |  |
Number outstanding | 3,901,333 |  |  | 10,584 |  |  | 159,135 |  |  | 4,071,052 |
Weighted-average exercise price | $ | 12.91 |  |  | $ | 18.62 |  |  | $ | 30.75 |  |  | $ | 13.62 |
Weighted-average assumptions used in Black-Scholes option pricing model | The following are the weighted-average assumptions used in the Black-Scholes option-pricing model for the years ended December 31, 2019, 2018 and 2017:
| For the year ended December 31,
| 2019 |  | 2018 |  | 2017
Risk-free interest rate | 2.00 | % |  | 2.26 | % |  | 1.97 | %
Expected volatility | 32.90 | % |  | 30.80 | % |  | 30.66 | %
Dividend yield | — |  |  | — |  |  | — |
Weighted-average expected life (in years) | 5.30 |  |  | 5.30 |  |  | 5.30 |
Information on restricted stock awards | The following table contains information on our RSAs:
| With Performance Conditions |  | Without Performance Conditions
| Number of Shares |  | Weighted- Average Grant Date Fair Value |  | Number of Shares |  | Weighted- Average Grant Date Fair Value
Nonvested as of January 1, 2019 | 351,472 |  |  | $ | 22.10 |  |  | 207,349 |  |  | $ | 25.55 |
Granted | 253,609 |  |  | $ | 23.55 |  |  | 175,795 |  |  | $ | 19.44 |
Vested | (193,799 | ) |  | $ | 19.36 |  |  | (35,758 | ) |  | $ | 18.05 |
Forfeited | (15,920 | ) |  | $ | 22.60 |  |  | (48,907 | ) |  | $ | 23.71 |
Nonvested as of December 31, 2019 | 395,362 |  |  | $ | 24.35 |  |  | 298,479 |  |  | $ | 23.15 |

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