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Share-Based Compensation (Notes) | 6 Months Ended
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Jun. 30, 2016
Share-based Compensation [Abstract] |
Disclosure of Compensation Related Costs, Share-based Payments | Share-Based Compensation Stock Benefit Plans We maintain benefit plans whereby shares of our common stock may be issued pursuant to the exercise of stock options, restricted stock, or other stock based awards granted to officers and key employees. In May 2016, our shareholders approved the 2016 Equity Incentive Plan that reserves 13,000,000 shares of common stock for outstanding and future awards of stock options, restricted stock, and other stock based awards to officers and key employees. 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 six months ended June 30, 2016:
Dividend yield | 2.0 | %
Expected volatility | 19.7 | %
Risk-free interest rate | 1.0 | %
Expected holding period (in years) | 4.0 |
Stock Options The following table sets forth stock option activity for the six months ended June 30, 2016:
| Options |  | Weighted-Average Exercise Price
Outstanding at December 31, 2015 | 11,047,920 |  |  | $ | 13.98 |
Granted | 1,863,700 |  |  | $ | 22.28 |
Exercised | (871,422 | ) |  | $ | 10.18 |
Canceled | (19,798 | ) |  | $ | 20.98 |
Outstanding at June 30, 2016 | 12,020,400 |  |  | $ | 15.53 |
Exercisable at June 30, 2016 | 8,153,847 |  |  | $ | 12.67 |
As of June 30, 2016, the unrecognized compensation expense related to stock options of $14.8 million is expected to be recognized over a weighted average period of 1.5 years. Restricted Stock Awards Restricted stock awards activity for the six months ended June 30, 2016 was as follows:
| Restricted Stock Awards |  | Weighted-Average Grant-Date Fair Value
Nonvested restricted stock awards at December 31, 2015 | 573,739 |  |  | $ | 19.32 |
Granted | 241,510 |  |  | $ | 22.28 |
Vested | (313,247 | ) |  | $ | 18.14 |
Forfeited | (1,258 | ) |  | $ | 20.85 |
Nonvested restricted stock awards at June 30, 2016 | 500,744 |  |  | $ | 21.48 |
As of June 30, 2016, the unrecognized compensation expense related to restricted stock awards of $8.6 million is expected to be recognized over a weighted average period of 2.0 years. Restricted Stock Units Restricted stock units (RSU) activity for the six months ended June 30, 2016 was as follows:
| Restricted Stock Units |  | Weighted-Average Grant-Date Fair Value
Nonvested restricted stock units at December 31, 2015 | — |  |  | $ | — |
Granted | 130,660 |  |  | $ | 25.72 |
Forfeited | (3,900 | ) |  | $ | 25.72 |
Nonvested restricted stock units at June 30, 2016 | 126,760 |  |  | $ | 25.72 |
As of June 30, 2016, the unrecognized compensation expense related to restricted stock units of $3.2 million is expected to be recognized over a weighted average period of 2.6 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=65895303&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=68057994&loc=d3e25284-112666 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 4: 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 5: 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 6: 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 + Details
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