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Common Stock (Tables) | 12 Months Ended
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Dec. 31, 2013
Information Related to Stock Repurchase Programs | The following schedule provides information related to our stock repurchase programs for each of the three years ended December 31, 2013. All of the shares repurchased during 2013 and 2012 related to income tax withholding obligations resulting from the exercise of stock options and the vesting of restricted stock grants. No shares were repurchased during 2013 or 2012 pursuant to our publicly announced stock repurchase program.
|  | Total number of shares purchased as part of publicly announced programs |  |  | Total price paid for shares purchased as part of publicly announced programs (in thousands) |  |  | Total number of shares purchased related to stock-based compensation plans (a.) |  |  | Total price paid for shares purchased related to stock-based compensation plans (in thousands) |  |  | Aggregate number of shares purchased |  |  | Aggregate price paid for shares purchased (in thousands) |  |  | Maximum number of shares that may yet be purchased under the publicly announced program |
Balance as of January 1, 2011 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,152,339 |
2011 |  |  | 1,384,637 |  |  | $ | 50,576 |  |  |  | 217,649 |  |  | $ | 9,906 |  |  |  | 1,602,286 |  |  | $ | 60,482 |  |  |  | 767,702 |
2012 |  |  | — |  |  |  | — |  |  |  | 433,312 |  |  | $ | 19,154 |  |  |  | 433,312 |  |  | $ | 19,154 |  |  |  | 767,702 |
2013 |  |  | — |  |  |  | — |  |  |  | 427,170 |  |  | $ | 27,201 |  |  |  | 427,170 |  |  | $ | 27,201 |  |  |  | 767,702 |
Total for three year period ended December 31, 2013 |  |  | 1,384,637 |  |  | $ | 50,576 |  |  |  | 1,078,131 |  |  | $ | 56,261 |  |  |  | 2,462,768 |  |  | $ | 106,837 |  |  |  |  |
(a.) | During 2013, there were 427,170 shares repurchased at an average price of $63.68 per share related to income tax withholding obligations in connection with stock-based compensation programs. During 2012, there were 432,562 shares repurchased at an average price of $44.28 per share related to income tax withholding obligations in connection with stock-based compensation programs, and 750 shares repurchased at an average of $.01 per share related to restricted shares that were forfeited by former employees pursuant to the terms of our restricted stock purchase plan. During 2011, there were 217,649 shares repurchased at an average price of $45.51 per share related to income tax withholding obligations in connection with stock-based compensation programs.
Weighted-Average Assumptions Fair Value of Option Grants | The weighted-average assumptions reflected below were each based upon eighteen option grants.
Year Ended December 31, |  | 2013 |  |  | 2012 |  |  | 2011 |
Volatility |  |  | 36 | % |  |  | 33 | % |  |  | 29 | %
Interest rate |  |  | 1 | % |  |  | 1 | % |  |  | 2 | %
Expected life (years) |  |  | 3.6 |  |  |  | 3.5 |  |  |  | 3.5 |
Forfeiture rate |  |  | 11 | % |  |  | 10 | % |  |  | 9 | %
Dividend yield |  |  | 0.5 | % |  |  | 0.6 | % |  |  | 0.7 | %
Stock Option Activity | The table below summarizes our stock option activity during each of the last three years:
Outstanding Options |  | Number of Shares |  |  | Average Option Price |  |  | Range (High-Low) |
Balance, January 1, 2011 |  |  | 6,594,950 |  |  | $ | 25.16 |  |  | $ | 32.28 -$16.22 |
Granted |  |  | 2,894,500 |  |  | $ | 43.66 |  |  | $ | 54.79 -$38.12 |
Exercised |  |  | (1,563,255 | ) |  | $ | 26.38 |  |  | $ | 32.28 -$16.22 |
Cancelled |  |  | (367,250 | ) |  | $ | 32.60 |  |  | $ | 46.97 -$16.22 |
Balance, January 1, 2012 |  |  | 7,558,945 |  |  | $ | 31.63 |  |  | $ | 54.79 -$16.22 |
Granted |  |  | 2,966,850 |  |  | $ | 37.01 |  |  | $ | 44.83 -$36.95 |
Exercised |  |  | (2,608,007 | ) |  | $ | 23.22 |  |  | $ | 46.97 -$16.22 |
Cancelled |  |  | (481,550 | ) |  | $ | 38.00 |  |  | $ | 46.97 -$16.22 |
Balance, January 1, 2013 |  |  | 7,436,238 |  |  | $ | 36.31 |  |  | $ | 54.79 -$16.22 |
Granted |  |  | 2,889,750 |  |  | $ | 53.51 |  |  | $ | 79.79 -$53.38 |
Exercised |  |  | (2,288,666 | ) |  | $ | 32.27 |  |  | $ | 54.79 -$16.22 |
Cancelled |  |  | (416,364 | ) |  | $ | 43.93 |  |  | $ | 53.38 -$16.22 |
Balance, December 31, 2013 |  |  | 7,620,958 |  |  | $ | 43.63 |  |  | $ | 79.79 -$30.32 |
Outstanding options vested and exercisable as of December 31, 2013 |  |  | 1,756,128 |  |  | $ | 35.60 |  |  | $ | 46.97 -$30.32 |
Information about Unvested Options | The following table provides information about unvested options for the year December 31, 2013:
|  | Shares |  |  | Weighted Average Grant Date Fair Value |
Unvested options as of January 1, 2013 |  |  | 5,250,926 |  |  | $ | 10.74 |
Granted |  |  | 2,889,750 |  |  | $ | 13.33 |
Vested |  |  | (1,864,982 | ) |  | $ | 10.22 |
Cancelled |  |  | (410,864 | ) |  | $ | 11.66 |
Unvested options as of December 31, 2013 |  |  | 5,864,830 |  |  | $ | 12.12 |
Information about all Outstanding Options and Exercisable Options | The following table provides information about all outstanding options, and exercisable options, at December 31, 2013:
|  | Options Outstanding |  |  | Options Exercisable |
Number |  |  | 7,620,958 |  |  |  | 1,756,128 |
Weighted average exercise price |  | $ | 43.64 |  |  | $ | 35.60 |
Aggregate intrinsic value as of December 31, 2013 |  | $ | 286,740,433 |  |  | $ | 80,189,277 |
Weighted average remaining contractual life |  |  | 2.9 |  |  |  | 1.6 |
Weighted Average Remaining Contractual Life for Options Outstanding and Weighted Average Exercise Price Per Share for Exercisable Options | The weighted average remaining contractual life for options outstanding and weighted average exercise price per share for exercisable options at December 31, 2013 were as follows:
|  | Options Outstanding |  |  | Exercisable Options |  |  | Expected to Vest Options (a) |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise Price |  | Shares |  |  | Weighted Average Exercise Price Per Share |  |  | Weighted Average Remaining Contractual Life (in Years) |  |  | Shares |  |  | Weighted Average Exercise Price Per Share |  |  | Shares |  |  | Weighted Average Exercise Price Per Share |
$30.32 – $36.95 |  |  | 3,183,583 |  |  | $ | 35.14 |  |  |  | 2.4 |  |  |  | 1,259,453 |  |  | $ | 32.45 |  |  |  | 1,716,901 |  |  | $ | 36.91 |
$38.12 – $43.67 |  |  | 1,685,350 |  |  |  | 43.56 |  |  |  | 2.1 |  |  |  | 496,175 |  |  |  | 43.58 |  |  |  | 1,061,101 |  |  |  | 43.55 |
$44.83 – $53.38 |  |  | 2,724,525 |  |  |  | 53.36 |  |  |  | 4.0 |  |  |  | 500 |  |  |  | 46.97 |  |  |  | 2,430,648 |  |  |  | 53.36 |
$54.79 – $79.79 |  |  | 27,500 |  |  |  | 67.64 |  |  |  | 4.0 |  |  |  | 0 |  |  |  | N/A |  |  |  | 24,538 |  |  |  | 67.64 |
Total |  |  | 7,620,958 |  |  | $ | 43.63 |  |  |  | 2.9 |  |  |  | 1,756,128 |  |  | $ | 35.60 |  |  |  | 5,233,188 |  |  | $ | 46.04 |
(a) | Assumes a weighted average forfeiture rate of 10.8%.

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