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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [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 thousands)
Outstanding as of January 1, 2018 | 6,551,314 |  |  | $ | 12.29 |  |  |  |  |  |
Granted | 663,343 |  |  | $ | 30.75 |  |  |  |  |  |
Exercised | (1,302,501 | ) |  | $ | 8.70 |  |  |  |  |  |
Forfeited | (42,945 | ) |  | $ | 16.67 |  |  |  |  |  |
Outstanding as of December 31, 2018 | 5,869,211 |  |  | $ | 15.14 |  |  | 3.97 |  | $ | 28,470 |
Exercisable as of December 31, 2018 | 3,099,460 |  |  | $ | 12.83 |  |  | 3.25 |  | $ | 17,992 |
Information about stock options by exercise price range | The following table summarizes information about our outstanding stock options as of December 31, 2018:
| Exercise Price Range |  | Total
| $8.88 to $13.35 |  | $13.50 to $20.52 |  | $20.75 to $32.90 |  | $8.88 to $32.90
Outstanding options |  |  |  |  |  |  |
Number outstanding | 3,637,366 |  |  | 1,570,183 |  |  | 661,662 |  |  | 5,869,211 |
Weighted-average remaining contractual life (years) | 3.22 |  |  | 4.87 |  |  | 6.01 |  |  | 3.97 |
Weighted-average exercise price | $ | 12.65 |  |  | $ | 14.38 |  |  | $ | 30.67 |  |  | $ | 15.14 |
Exercisable options |  |  |  |  |  |  |
Number outstanding | 2,645,735 |  |  | 452,466 |  |  | 1,259 |  |  | 3,099,460 |
Weighted-average exercise price | $ | 12.53 |  |  | $ | 14.56 |  |  | $ | 20.75 |  |  | $ | 12.83 |
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, 2018, 2017 and 2016:
| For the year ended December 31,
| 2018 |  | 2017 |  | 2016
Risk-free interest rate | 2.26 | % |  | 1.97 | % |  | 1.20 | %
Expected volatility | 30.80 | % |  | 30.66 | % |  | 31.23 | %
Dividend yield | — |  |  | — |  |  | — |
Weighted-average expected life (in years) | 5.30 |  |  | 5.30 |  |  | 5.40 |
Information on restricted stock awards | restricted stock awards with performance-based vesting conditions under its Performance Share Programs. Additionally, in conjunction with the Pinnacle Acquisition, the Company awarded 129,961 restricted stock awards to new employees of the Company. The following table contains information on our restricted stock awards:
| Number of Shares |  | Weighted Average Grant Date Fair Value
Outstanding as of January 1, 2018 | 267,655 |  |  | $ | 13.83 |
Awarded | 333,478 |  |  | $ | 30.00 |
Released | (30,979 | ) |  | $ | 14.15 |
Canceled | (11,333 | ) |  | $ | 17.96 |
Outstanding at December 31, 2018 | 558,821 |  |  | $ | 23.38 |

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