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Stock-based Compensation (Tables) | 9 Months Ended
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Sep. 30, 2013
Share-based Payment Award, Stock Options, Valuation Assumptions | The following table shows the significant assumptions used in connection with the determination of the fair value of options granted in the nine months ended September 30, 2013. No options were granted in the nine months ended September 30, 2012.
|  | Nine months ended September 30, 2013 |
Dividend Yield |  |  | 0 | %
Expected life (in months) |  |  | 84 |
Risk free rate of interest |  |  | 1.55 | %
Volatility |  |  | 39.39 | %
Summary of Options Activity | A summary of options activity during the nine months ended September 30, 2013 is set out below:
|  | Nine months ended September 30, 2013 |
|  | Shares arising out of options |  |  | Weighted average exercise price |  |  | Weighted average remaining contractual life (years) |  |  | Aggregate intrinsic value |
Outstanding as of January 1, 2013 |  |  | 12,413,298 |  |  | $ | 9.29 |  |  |  | 4.2 |  |  |  |  |
Granted |  |  | 3,483,000 |  |  |  | 19.35 |  |  |  |  |  |  |  |  |
Forfeited |  |  | (63,056 | ) |  |  | 10.47 |  |  |  |  |  |  |  |  |
Expired |  |  | (67,978 | ) |  |  | 13.79 |  |  |  |  |  |  |  |  |
Exercised |  |  | (3,784,851 | ) |  |  | 8.76 |  |  |  |  |  |  |  | 38,149 |
Outstanding as of September 30, 2013 |  |  | 11,980,413 |  |  | $ | 12.35 |  |  |  | 5.32 |  |  | $ | 80,652 |
Vested as of September 30, 2013 and expected to vest thereafter (a) |  |  | 11,596,240 |  |  | $ | 12.07 |  |  |  | 5.32 |  |  | $ | 80,471 |
Vested and Exercisable as of September 30, 2013 |  |  | 7,547,192 |  |  | $ | 9.27 |  |  |  | 3.24 |  |  | $ | 72,524 |
Weighted average grant date fair value of grants during the period |  | $ | 19.35 |  |  |  |  |  |  |  |  |  |  |  |  |
(a) | Options expected to vest reflect an estimated forfeiture rate.
Summary of Restricted Share Units Granted | A summary of RSUs granted during the nine months ended September 30, 2013 is set out below:
|  | Nine months ended September 30, 2013 |
|  | Number of Restricted Share Units |  |  | Weighted Average Grant Date Fair Value |
Outstanding as of January 1, 2013 |  |  | 1,688,402 |  |  | $ | 13.74 |
Granted |  |  | 91,623 |  |  |  | 19.52 |
Vested* |  |  | (294,451 | ) |  |  | 14.49 |
Forfeited |  |  | (190,665 | ) |  |  | 13.62 |
Outstanding as of September 30, 2013 |  |  | 1,294,909 |  |  | $ | 14.00 |
Expected to vest (a) |  |  | 1,165,351 |  |  |  |  |
(a) | RSUs expected to vest reflect an estimated forfeiture rate.
* | Vested RSUs have been net settled upon vesting by issuing 188,966 shares (net of minimum statutory withholding taxes).
Summary of Performance Units Activity | A summary of PUs activity during the nine months ended September 30, 2013 is set out below:
|  | Nine months ended September 30, 2013 |
|  | Number of Performance Units |  |  | Weighted Average Grant Date Fair Value |  |  | Maximum Shares Eligible to Receive |
Outstanding as of January 1, 2013 |  |  | 3,041,511 |  |  | $ | 13.26 |  |  |  | 4,402,597 |
Granted |  |  | 2,025,090 |  |  |  | 18.57 |  |  |  | 3,694,635 |
Vested |  |  | — |  |  |  | — |  |  |  | — |
Forfeited |  |  | (200,654 | ) |  |  | 15.13 |  |  |  | (256,064 | )
Addition due to achievement of higher than target performance goals* |  |  | 297,911 |  |  |  | 17.50 |  |  |  |  |
Reduction due to achievement of lower than maximum performance goals** |  |  |  |  |  |  |  |  |  |  | (373,702 | )
Outstanding as of September 30, 2013 |  |  | 5,163,858 |  |  | $ | 15.51 |  |  |  | 7,467,466 |
Expected to vest (a) |  |  | 2,542,867 |  |  |  |  |  |  |  |  |
(a) | PUs expected to vest are based on the probable achievement of the performance targets after considering an estimated forfeiture rate
* | Represents the additional award of 22.2% of the target shares on account of the achievement of higher than target performance for the PUs granted in March 2012.
** | Represents a 27.8% reduction in the maximum shares eligible to vest on account of the certification of the performance goals for the PUs granted in 2012.
Modification of Performance Metrics for Performance Grants Made to Employees |
|  | Original Performance Target |  |  | Modified Performance Target |
Performance Level |  | Revenue Growth |  |  | EBITDA Growth |  |  | Revenue Growth |  |  | Adjusted Income from Operation growth |
Outstanding |  |  | 20.0 | % |  |  | 20.0 | % |  |  | 20.0 | % |  |  | 20.0 | %
Target |  |  | 15.0 | % |  |  | 15.0 | % |  |  | 15.0 | % |  |  | 15.0 | %
Threshold |  |  | 10.0 | % |  |  | 10.0 | % |  |  | 10.0 | % |  |  | 10.0 | %
Modification of Performance Metrics for Performance Grants Made to Former Chief Executive Officer |
|  | Original Performance Target |  |  | Modified Performance Target |
Performance Level |  | Revenue Growth |  |  | EBITDA Growth |  |  | Revenue Growth |  |  | Adjusted Income from Operation growth |
Outstanding |  |  | 20.0 | % |  |  | 20.0 | % |  |  | 17.0 | % |  |  | 16.0 | %
Target |  |  | 15.0 | % |  |  | 15.0 | % |  |  | 12.5 | % |  |  | 12.5 | %
Threshold |  |  | 10.0 | % |  |  | 10.0 | % |  |  | 8.0 | % |  |  | 7.0 | %

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