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Share-Based Compensation | 6 Months Ended
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Jun. 30, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Share-Based Compensation | Share-Based Compensation A summary of stock-based compensation expense for the six months ended June 30, 2017 and 2016 is as follows:
| Six Months Ended June 30,
| 2017 |  | 2016
| (in thousands)
Stock options | $ | 2,040 |  |  | $ | 1,605 |
Restricted stock and restricted stock units | 584 |  |  | 273 |
Employee Stock Purchase Plan | 249 |  |  | 213 |
Total pre-tax stock-based compensation expense charged against income (1) | $ | 2,873 |  |  | $ | 2,091 |
(1) | Stock-based compensation expense is recorded in selling, general and administrative expense in our Consolidated Statements of Comprehensive Income.
At June 30, 2017, the unrecognized compensation cost related to unvested stock options and awards was $13.7 million. The weighted average period over which these awards will vest is approximately 3.2 years. 2012 Equity Incentive Plan The Company’s 2012 Equity Incentive Plan (the “Plan”) provides that current or prospective officers, employees, non-employee directors and advisors can receive share-based awards such as stock options, restricted stock, restricted stock units and other stock awards. The Plan seeks to promote the highest level of performance by providing an economic interest in the long-term success of the Company. As of June 30, 2017, 3.6 million shares of common stock were reserved for issuance under the Plan, including 0.7 million shares available for future grant. No stock award will have a term in excess of ten years. All awards granted under the Plan become vested and exercisable ratably over a five year period on each yearly anniversary of the grant date. The Nominating, Compensation and Stock Option Committee of the Board of Directors is responsible for determining the terms of the grants in accordance with the Plan. Stock Options A summary of stock options outstanding under the Plan as of December 31, 2016 and changes during the six months ended June 30, 2017 is as follows:
| Stock Options Outstanding
| Number of Shares |  | Weighted Average Exercise Price
| (in thousands) |  |
December 31, 2016 | 2,615 |  |  | $ | 24.61 |
Granted | 544 |  |  | $ | 39.38 |
Canceled | (61 | ) |  | $ | 33.96 |
Exercised | (334 | ) |  | $ | 22.14 |
June 30, 2017 | 2,764 |  |  | $ | 27.61 |
The weighted average grant-date fair value of stock options granted during the six months ended June 30, 2017 and 2016 was $8.52 and $7.46 per common share, respectively. The total intrinsic value of options exercised during the six months ended June 30, 2017 and 2016 was $7.0 million and $3.9 million, respectively. The fair value of stock option awards granted in 2017 and 2016 was estimated on the date of grant using the Black-Scholes option valuation model using the following assumptions:
| Six Months Ended
| 2017 |  | 2016
Risk-free interest rate | 2.0 | % |  | 2.0 | %
Weighted average expected life (years) | 5.8 years |  |  | 5.8 years |
Expected volatility | 25.1 | % |  | 26.0 | %
Dividend yield | 1.9 | % |  | 2.0 | %
The following table summarizes other information about the stock options at June 30, 2017:
|  | June 30, 2017
|  | (in thousands, except per share data)
Outstanding: |  |
Aggregate intrinsic value |  | $ | 53,140 |
Weighted average remaining contractual life (years) |  | 6.5 years |
Exercisable: |  |
Number of options |  | 1,305 |
Weighted average exercise price |  | $ | 20.51 |
Aggregate intrinsic value |  | $ | 34,338 |
Weighted average remaining contractual life (years) |  | 4.5 years |
Restricted Stock During the six months ended June 30, 2017, the Company did no t grant any restricted stock. During the six months ended June 30, 2016, the Company granted 44 thousand 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. A summary of the outstanding restricted stock awards as of December 31, 2016 and changes during the six months ended June 30, 2017 is as follows:
| Shares |  | Weighted Average Grant Date Fair Value
| (in thousands) |  |
December 31, 2016 | 74 |  |  | $ | 32.09 |
Granted | — |  |  | $ | — |
Vested | (18 | ) |  | $ | 31.41 |
Forfeited | — |  |  | $ | — |
June 30, 2017 | 56 |  |  | $ | 32.30 |
Restricted Stock Units During the six months ended June 30, 2017, the Company granted 81 thousand restricted stock units with a weighted average grant date fair value of $39.38 per unit. Fair value is determined based on the market price of the underlying shares on the date of grant. During the six months ended June 30, 2016, there were no grants of restricted stock units. A summary of the outstanding restricted stock units as of December 31, 2016 and changes during the six months ended June 30, 2017 is as follows:
| Units |  | Weighted Average Grant Date Fair Value
| (in thousands) |  |
December 31, 2016 | — |  |  | $ | — |
Granted | 81 |  |  | $ | 39.38 |
Vested | — |  |  | $ | — |
Forfeited | — |  |  | $ | — |
June 30, 2017 | 81 |  |  | $ | 39.38 |
Employee Stock Purchase Plan The Company's Employee Stock Purchase Plan ("ESPP") is currently available through 2021 to all eligible employees. 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, the Company is authorized to issue up to 4.1 million shares of its common stock to our employees. Pursuant to such authorization, there are 2.3 million shares available for future grant at June 30, 2017. The stock-based compensation expense associated with the options granted under the ESPP during the six months ended June 30, 2017 and 2016 was estimated on the date of grant using the Black-Scholes option valuation model using the following assumptions:
| Six Months Ended June 30,
| 2017 |  | 2016
Risk-free interest rate | 1.05% |  | 0.58%
Weighted average expected life (years) | 1.0 |  | 1.0
Expected volatility | 21.2% |  | 19.7%
Dividend yield | 1.9% |  | 2.0%
Deferred Compensation Plan The Company offers a Supplemental Executive Retirement Plan (“SERP”) for certain key executives and employees. The SERP allows participants to defer a portion of their earned income on a pre-tax basis and as of the last day of each plan year, each participant will be credited with a match of a portion of their deferral in the form of the Company’s Common Stock based on the then-current market value. Under the SERP, the Company is authorized to issue 1.0 million shares of its common stock to its employees. Pursuant to such authorization, the Company has 0.4 million shares available for future grant at June 30, 2017. At the time of issuance, such shares are accounted for at cost as treasury stock. The following table summarizes information about the SERP during the six months ended June 30, 2017 and 2016:
| Six Months Ended June 30,
| 2017 |  | 2016
| (in thousands)
SERP expense (1) | $ | 308 |  |  | $ | 309 |
Unrealized gain recorded in SERP liability account | $ | 2,313 |  |  | $ | 218 |
(1) Both the SERP match and the deferrals are included in the selling, general and administrative caption in the consolidated statements of comprehensive income.

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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 -URI http://asc.fasb.org/topic&trid=2228938 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -URI http://asc.fasb.org/subtopic&trid=2208855 + Details
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