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Share-Based Compensation | 3 Months Ended
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Mar. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Share-Based Compensation | Share-Based Compensation A summary of stock-based compensation expense for the three months ended March 31, 2016 and 2015 is as follows:
| For the Three Months Ended March 31,
| 2016 |  | 2015
Stock options | $ | 878,000 |  |  | $ | 719,000 |
Restricted stock | 135,000 |  |  | 58,000 |
Employee Stock Purchase Plan ("ESPP") | 105,000 |  |  | 107,000 |
Total pre-tax stock-based compensation expense charged against income (1) | $ | 1,118,000 |  |  | $ | 884,000 |
(1) | Stock-based compensation expense is recorded in selling, general and administrative expense in our consolidated statements of comprehensive income.
At March 31, 2016, the unrecognized compensation cost related to unvested stock options and awards was $11,254,000. The weighted average period over which these awards will vest is approximately 3.5 years. Other information pertaining to activity of our stock awards during the three months ended March 31, 2016 and 2015 were as follows:
| March 31, 2016 |  | March 31, 2015
Total grant-date fair value of stock options and awards granted | $ | 5,202,000 |  |  | $ | 4,027,000 |
Total fair value of stock options and awards vested during period | $ | 3,092,000 |  |  | $ | 2,719,000 |
2012 Equity Incentive Plan The Company's 2012 Equity Incentive Plan (the "2012 Plan") provides that current or prospective officers, employees, non-employee directors and advisors can receive share-based awards such as stock options, restricted stock and other stock awards. The 2012 Plan seeks to promote the highest level of performance by providing an economic interest in the long-term success of the Company. As of the adoption of the 2012 Plan, no further grants were permitted under any previously existing stock plans (the "Pre-existing Plans"). Additionally, all remaining shares available for future grants under the Pre-existing Plans became available for issuance under the 2012 Plan. We have outstanding stock awards that were granted under the Pre-existing Plans to non-employee directors, officers and employees of the Company and other specified groups, depending on the Pre-existing Plan. As of March 31, 2016, 4,089,000 shares of common stock were reserved for issuance under our 2012 Plan, including 1,196,000 shares available for future grant. The stock price will not be less than the fair market value of the common stock on the date the award is granted. No stock award will have a term in excess of ten years. Since 2008, all awards granted under the Pre-existing Plans and the 2012 Plan become vested and exercisable ratably over a five year period on each yearly anniversary date of the option grant. The Nominating, Compensation and Stock Option Committee of the Board of Directors is responsible for determining the individuals who will be granted stock awards, the number of stock awards each individual will receive, the price per share (in accordance with the terms of the 2012 Plan), and the exercise period of each stock award. Stock Options A summary of our stock options outstanding under the 2012 Plan as of December 31, 2015 and changes during the three months ended March 31, 2016 is as follows:
| Stock Options Outstanding
| Number of Shares |  | Weighted Average Exercise Price
December 31, 2015 | 2,461,000 |  |  | $ | 22.16 |
Granted | 569,000 |  |  | $ | 34.14 |
Cancelled | (13,000 | ) |  | $ | 28.39 |
Exercised | (124,000 | ) |  | $ | 20.83 |
March 31, 2016 | 2,893,000 |  |  | $ | 24.54 |
The weighted average grant-date fair value of stock options granted during the three months ended March 31, 2016 and 2015 was $7.46 and $6.64 per common share, respectively. The following table summarizes other information about our stock options at March 31, 2016:
|  | Stock Options
Range of exercise prices |  | $10.39-$34.14 |
Outstanding: |  |
Weighted average remaining contractual life (years) |  | 7.0 |
Aggregate intrinsic value |  | $ | 35,492,000 |
Exercisable: |  |
Number of shares |  | 1,346,000 |
Weighted average remaining contractual life (years) |  | 5.2 |
Aggregate intrinsic value |  | $ | 24,454,000 |
Exercised: |  |
Aggregate intrinsic value |  | $ | 1,737,000 |
The fair value of stock option awards granted in 2016 and 2015 was estimated on the date of grant using the Black-Scholes option valuation model using the following assumptions:
| Three months ended March 31,
| 2016 |  | 2015
Risk-free interest rate | 2.0% |  | 1.9%
Weighted average expected life in years | 5.8 years |  | 5.8 years
Expected volatility | 26.0% |  | 27.2%
Dividend yield | 2.0% |  | 2.2%
Restricted Stock During the three months ended March 31, 2016, the Company granted 44,000 shares of restricted stock with a weighted average grant date fair value of $34.14 per share. Fair value is determined based on the market price of the shares on the date of grant. During the three months ended March 31, 2015, the Company granted 25,000 shares of restricted stock with a weighted average grant date fair value of $30.30 per share. A summary of our outstanding stock-based compensation as of December 31, 2015 and changes during the three months ended March 31, 2016 is as follows:
| Shares |  | Weighted Average Grant Date Fair Value
December 31, 2015 | 40,000 |  |  | $ | 29.10 |
Granted | 44,000 |  |  | $ | 34.14 |
Vested | (9,000 | ) |  | $ | 28.76 |
Forfeited | — |  |  | $ | — |
March 31, 2016 | 75,000 |  |  | $ | 32.10 |
Employee Stock Purchase Plan We have an Employee Stock Purchase Plan ("ESPP") for all eligible employees. The ESPP currently extends through 2016. All full-time and certain part-time employees who have completed two years of continuous service with us are eligible to participate. Annual offerings commence and terminate on the respective year’s first and last calendar day. Under the ESPP, we are authorized to issue up to 4,050,000 shares of our common stock to our employees. Pursuant to such authorization, we have 2,362,000 shares available for future grant at March 31, 2016. The stock-based compensation expense associated the options granted under our ESPP was estimated on the date of grant using the Black-Scholes option valuation model using the following assumptions:
| Three months ended March 31,
| 2016 |  | 2015
Risk-free interest rate | 0.58% |  | 0.18%
Weighted average expected life in years | 1.0 year |  | 1.0 year
Expected volatility | 19.7% |  | 19.2%
Dividend yield | 2.0% |  | 2.2%

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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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