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Share-Based Compensation (Tables) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 | Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |  |
Summary of Performance Based Stock Options | Performance-based option activity under the 2007 SIP and the 2013 SIP for the period was as follows:
|  | Shares |  |  | Weighted Average Exercise Price (per share) |  |  | Weighted Average Remaining Contractual Term (in years) |  |  | Aggregate Intrinsic Value (in millions) |
Performance-based options outstanding at December 31, 2017 |  |  | 1,038,147 |  |  | $ | 13.46 |  |  |  | 3.5 |  |  | $ | — |
Granted |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Exercised |  |  | (633,606 | ) |  |  | (13.46 | ) |  |  | — |  |  |  | — |
Forfeited or expired |  |  | (8,358 | ) |  |  | (13.46 | ) |  |  | — |  |  |  | — |
Performance-based options outstanding at September 30, 2018 |  |  | 396,183 |  |  | $ | 13.50 |  |  |  | 3.4 |  |  | $ | 11.3 |
Performance-based options exercisable at September 30, 2018 |  |  | 396,183 |  |  | $ | 13.50 |  |  |  | 3.4 |  |  | $ | 11.3 |
| Performance-based option activity for the period from December 31, 2014 to December 31, 2017, represents stock options granted under the 2013 HCM SIP.
|  | Shares |  |  | Weighted Average Exercise Price (per share) |  |  | Weighted Average Remaining Contractual Term (in years) |  |  | Aggregate Intrinsic Value (in millions) |
Options outstanding at December 31, 2014 |  |  | 1,343,100 |  |  | $ | 13.46 |  |  |  | 6.3 |  |  | $ | — |
Granted |  |  | — |  |  |  | — |  |  |  |  |  |  |  |  |
Exercised |  |  | — |  |  |  | — |  |  |  |  |  |  |  |  |
Forfeited or expired |  |  | (62,232 | ) |  |  | (13.46 | ) |  |  |  |  |  |  |  |
Options outstanding at December 31, 2015 |  |  | 1,280,868 |  |  | $ | 13.46 |  |  |  | 5.2 |  |  | $ | — |
Granted |  |  | — |  |  |  | — |  |  |  |  |  |  |  |  |
Exercised |  |  | — |  |  |  | — |  |  |  |  |  |  |  |  |
Forfeited or expired |  |  | (52,942 | ) |  |  | (13.46 | ) |  |  |  |  |  |  |  |
Options outstanding at December 31, 2016 |  |  | 1,227,926 |  |  | $ | 13.46 |  |  |  | 4.2 |  |  | $ | — |
Granted |  |  | — |  |  |  | — |  |  |  |  |  |  |  |  |
Exercised |  |  | (167,202 | )(a) |  |  | (13.46 | ) |  |  |  |  |  |  |  |
Forfeited or expired |  |  | (25,077 | ) |  |  | (13.46 | ) |  |  |  |  |  |  |  |
Options outstanding at December 31, 2017 |  |  | 1,035,647 |  |  | $ | 13.46 |  |  |  | 3.5 |  |  | $ | — |
(a) | During the year ended December 31, 2017, certain performance-based options were modified and exercised.
Summary of Term-Based Option Activity | Term-based option activity, including stock options under the 2007 SIP, the 2013 SIP and the 2018 EIP, for the period was as follows:
|  | Shares |  |  | Weighted Average Exercise Price (per share) |  |  | Weighted Average Remaining Contractual Term (in years) |  |  | Aggregate Intrinsic Value (in millions) |
Term-based options outstanding at December 31, 2017 |  |  | 10,994,181 |  |  | $ | 16.52 |  |  |  | 6.9 |  |  | $ | 48.8 |
Granted |  |  | 5,140,787 |  |  |  | 22.84 |  |  |  | — |  |  |  | — |
Exercised |  |  | (1,127,360 | ) |  |  | (13.73 | ) |  |  | — |  |  |  | — |
Forfeited or expired |  |  | (166,747 | ) |  |  | (17.09 | ) |  |  | — |  |  |  | — |
Term-based options outstanding at September 30, 2018 |  |  | 14,840,861 |  |  | $ | 18.66 |  |  |  | 7.6 |  |  | $ | 346.8 |
Term-based options exercisable at September 30, 2018 |  |  | 6,868,950 |  |  | $ | 16.70 |  |  |  | 5.8 |  |  | $ | 174.0 |
| Term-based option activity for the period from December 31, 2014 to December 31, 2017, represents stock options granted under the 2013 HCM SIP. As of December 31, 2017, there were 6,819,649 vested options.
|  | Shares |  |  | Weighted Average Exercise Price (per share) |  |  | Weighted Average Remaining Contractual Term (in years) |  |  | Aggregate Intrinsic Value (in millions) |
Options outstanding at December 31, 2014 |  |  | 7,588,078 |  |  | $ | 15.98 |  |  |  | 8.2 |  |  | $ | 13.3 |
Granted |  |  | 187,140 |  |  |  | 17.56 |  |  |  |  |  |  |  |  |
Exercised |  |  | — |  |  |  | — |  |  |  |  |  |  |  |  |
Forfeited or expired |  |  | (168,060 | ) |  |  | (16.40 | ) |  |  |  |  |  |  |  |
Options outstanding at December 31, 2015 |  |  | 7,607,158 |  |  | $ | 16.02 |  |  |  | 7.3 |  |  | $ | 14.1 |
Granted |  |  | 2,339,238 |  |  |  | 16.80 |  |  |  |  |  |  |  |  |
Exercised |  |  | — |  |  |  | — |  |  |  |  |  |  |  |  |
Forfeited or expired |  |  | (176,626 | ) |  |  | (16.54 | ) |  |  |  |  |  |  |  |
Options outstanding at December 31, 2016 |  |  | 9,769,770 |  |  | $ | 16.20 |  |  |  | 7.1 |  |  | $ | 9.9 |
Granted |  |  | 2,285,981 |  |  |  | 17.46 |  |  |  |  |  |  |  |  |
Exercised |  |  | (595,464 | ) |  |  | (15.14 | ) |  |  |  |  |  |  |  |
Forfeited or expired |  |  | (468,606 | ) |  |  | (16.10 | ) |  |  |  |  |  |  |  |
Options outstanding at December 31, 2017 |  |  | 10,991,681 |  |  | $ | 16.52 |  |  |  | 6.9 |  |  | $ | 48.8 |
Options exercisable at December 31, 2017 |  |  | 6,819,649 |  |  | $ | 16.14 |  |  |  | 5.5 |  |  | $ | 32.9 |
Summary of Restricted Stock Units | Restricted stock units (“RSUs”) activity, including RSUs under the 2013 SIP and the 2018 EIP, for the period was as follows:
|  | Shares |
RSUs outstanding at December 31, 2017 |  |  | 605,990 |
Granted |  |  | 159,323 |
Shares issued upon vesting of RSUs |  |  | (105,990 | )
Forfeited or canceled |  |  | — |
RSUs outstanding at September 30, 2018 |  |  | 659,323 |
RSUs releasable at September 30, 2018 |  |  | 125,000 |
| Restricted stock units (“RSUs”) activity for the period from December 31, 2014 to December 31, 2017, represents restricted stock units granted under the 2013 HCM SIP.
|  | Shares |
RSUs outstanding at December 31, 2014 |  |  | — |
Granted |  |  | 228,572 |
Shares issued upon vesting of RSUs |  |  | — |
Forfeited or canceled |  |  | — |
RSUs outstanding at December 31, 2015 |  |  | 228,572 |
Granted |  |  | 29,800 |
Shares issued upon vesting of RSUs |  |  | (76,192 | )
Forfeited or canceled |  |  | — |
RSUs outstanding at December 31, 2016 |  |  | 182,180 |
Granted |  |  | 500,000 |
Shares issued upon vesting of RSUs |  |  | (76,190 | )
Forfeited or canceled |  |  | — |
RSUs outstanding at December 31, 2017 |  |  | 605,990 |
Schedule of Other Term-Based Option Activity |  | Other information pertaining to term-based options is as follows:
|  | Year Ended December 31, |
|  | 2017 |  |  | 2016 |  |  | 2015 |
Weighted average grant date fair value per share |  | $ | 5.88 |  |  | $ | 5.74 |  |  | $ | 5.68 |
Schedule of Other Term-Based Option Activity |  | The fair value of the term-based stock options was estimated at the date of grant using the Black-Scholes option pricing model with the following weighted-average assumptions:
|  | Year Ended December 31, |
|  | 2017 |  |  | 2016 |  |  | 2015 |
Expected volatility |  |  | 30.0 | % |  |  | 30.0 | % |  |  | 33.0 | %
Expected dividend rate |  |  | — |  |  |  | — |  |  |  | — |
Risk-free interest rate |  |  | 2.3 | % |  |  | 1.9 | % |  |  | 2.1 | %
Schedule of Other Class D Stock Options |  | Other information pertaining to restricted stock units is as follows:
|  | Year Ended December 31, |
|  | 2017 |  |  | 2016 |  |  | 2015 |
Weighted average grant date fair value per share |  | $ | 17.26 |  |  | $ | 17.40 |  |  | $ | 17.50 |

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