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Stockholders' Equity (Tables) | 9 Months Ended
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Sep. 30, 2018
Equity [Abstract] |
Schedule of Stock Option Plan Activity | The following is a summary of our stock option and restricted stock activity and related information:
| Stock Options |  |  |  | Restricted Stock Awards |  |
| Shares |  | Weighted-Average Exercise Price |  | Shares |  | Weighted-Average Grant Date Fair Value
Balance as of December 31, 2017 | 1,876,332 |  | $ | 53.17 |  | 133,294 |  | $ | 91.60
Granted | 224,312 |  | 161.83 |  | 62,033 |  | 169.91
Options exercised/RSUs vested | (318,653) |  | 58.64 |  | (60,135) |  | 83.95
Forfeited | (12,228) |  | 104.54 |  | (1,165) |  | 125.16
Balance as of September 30, 2018 | 1,769,763 |  | $ | 65.60 |  | 134,027 |  | $ | 130.99
Schedule of Restricted Stock Activity | The following is a summary of our stock option and restricted stock activity and related information:
| Stock Options |  |  |  | Restricted Stock Awards |  |
| Shares |  | Weighted-Average Exercise Price |  | Shares |  | Weighted-Average Grant Date Fair Value
Balance as of December 31, 2017 | 1,876,332 |  | $ | 53.17 |  | 133,294 |  | $ | 91.60
Granted | 224,312 |  | 161.83 |  | 62,033 |  | 169.91
Options exercised/RSUs vested | (318,653) |  | 58.64 |  | (60,135) |  | 83.95
Forfeited | (12,228) |  | 104.54 |  | (1,165) |  | 125.16
Balance as of September 30, 2018 | 1,769,763 |  | $ | 65.60 |  | 134,027 |  | $ | 130.99

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