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Share-Based Compensation (Notes) | 9 Months Ended
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Sep. 30, 2015
Share-based Compensation [Abstract] |
Disclosure of Compensation Related Costs, Share-based Payments | Share-Based Compensation Stock Benefit Plans We utilize the Black-Scholes option valuation model for estimating the fair value of our stock options. This model uses a range of assumptions related to volatility, the risk-free interest rate, the expected life, and the dividend yield. The fair values of our stock options are calculated using the following weighted average assumptions for the nine months ended September 30, 2015:
|  | Nine Months Ended
Assumptions |  | September 30, 2015
Dividend yield |  | 1.8 | %
Expected volatility |  | 23.3 | %
Risk-free interest rate |  | 1.3 | %
Expected holding period (in years) |  | 4.0 |
Stock Options The following table sets forth stock option activity for the nine months ended September 30, 2015:
| Options |  | Weighted-Average Exercise Price
Outstanding at December 31, 2014 | 12,107,106 |  |  | $ | 11.63 |
Granted | 2,036,010 |  |  | $ | 23.00 |
Exercised | (2,945,438 | ) |  | $ | 10.44 |
Canceled | (21,400 | ) |  | $ | 20.59 |
Outstanding at September 30, 2015 | 11,176,278 |  |  | $ | 13.98 |
Exercisable at September 30, 2015 | 7,008,300 |  |  | $ | 10.58 |
As of September 30, 2015, the unrecognized compensation expense related to stock options of $10.4 million is expected to be recognized over a weighted average period of 1.3 years. Restricted Shares Restricted share activity for the nine months ended September 30, 2015 was as follows:
| Restricted Shares |  | Weighted-Average Grant-Date Fair Value
Nonvested restricted shares at December 31, 2014 | 1,319,260 |  |  | $ | 13.39 |
Granted | 253,791 |  |  | $ | 23.00 |
Forfeited | (3,840 | ) |  | $ | 20.47 |
Vested | (990,558 | ) |  | $ | 12.37 |
Nonvested restricted shares at September 30, 2015 | 578,653 |  |  | $ | 19.32 |
As of September 30, 2015, the unrecognized compensation expense related to restricted shares of $7.6 million is expected to be recognized over a weighted average period of 1.8 years.

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- Definition The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 40 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6418621&loc=d3e17540-113929 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=51659978&loc=d3e25284-112666 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5444-113901 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 + Details
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