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Share-Based Compensation | 12 Months Ended
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Dec. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Share-Based Compensation | Share-Based Compensation We have historically maintained a stock option plan for key employees, directors and consultants (“the 1992 Plan”). The 1992 Plan provided for 14.9 million shares to be issued under the plan in the form of stock options. Under the terms of the plan, the exercise price of shares granted may not be less than 85% of the fair market value at the date of the grant. Options granted to directors prior to May 25, 2004, vest one year from the date of grant and are exercisable for nine years thereafter. Options granted to directors on or after May 25, 2004, vest one-third each year, commencing one year after the date of grant. All other options granted vest at a rate of 20% per year, commencing one year after date of grant, and are exercisable during years 2-10. On May 22, 2007, our stockholders adopted a Long-Term Incentive Plan (“LTIP”) which provides an additional 3.3 million shares that can be granted in the form of stock options, stock appreciation rights, restricted stock awards, performance units and performance awards. Since inception of the Plan, non-qualified stock options and restricted stock awards have been granted with the same vesting schedule as the previous plan. Under the LTIP, the exercise price of shares granted may not be less than 100% of the fair market value at the date of the grant. The total pre-tax compensation cost related to unvested stock options not yet recognized as of December 31, 2015 is $2.4 million and is expected to be recognized over a weighted-average period of 2.05 years. The following weighted average assumptions were used to determine the fair value of the stock options granted on the original grant date for expense recognition purposes for options granted during December 31, 2015, 2014 and 2013 using a Black Scholes-Merton Model:
| 2015 |  | 2014 |  | 2013
Director and Officers: |  |  |  |  |
Expected dividend yield | $ | 0.18 |  |  | N/A |  |  | $ | 0.08 |
Expected volatility | 44.14 | % |  | N/A |  |  | 47.08 | %
Risk-free interest rate | 1.97 | % |  | N/A |  |  | 1.55 | %
Expected life (in years) | 8 |  |  | N/A |  |  | 7 |
Employees: |  |  |  |  |  |  |
Expected dividend yield | $ | 0.22 |  |  | $ | 0.14 |  |  | $ | 0.08 |
Expected volatility | 42.71 | % |  | 44.85 | % |  | 45.92 | %
Risk-free interest rate | 1.41 | % |  | 2.26 | % |  | 1.40 | %
Expected life (in years) | 8 |  |  | 8 |  |  | 8 |
The expected term of the options is based on evaluations of historical and expected future employee exercise behavior. The risk-free interest rate is based on the U.S. Treasury rates at the date of grant with maturity dates approximately equal to the expected life at the grant date. Volatility is based on historical volatility of our stock over time periods equal to the expected life at grant date. The following is a summary of stock options vested and exercisable as of December 31, 2015:
|  |  |  | Weighted Average |  | Weighted |  |
Range of |  | Number |  | Remaining |  | Average |  |
Exercise |  | of |  | Contractual |  | Exercise |  | Intrinsic
Prices |  | Shares |  | Life |  | Price |  | Value
|  |  |  |  |  |  |  | (in thousands)
$4.31 - 8.65 |  | 421,237 |  |  | 4.89 |  | $ | 7.04 |  |  | $ | 6,814 |
$8.70 - 22.76 |  | 27,134 |  |  | 7.82 |  | 15.31 |  |  | 215 |
$23.57 - 23.57 |  | — |  |  | 0.00 |  | — |  |  | — |
Total |  | 448,371 |  |  | 5.07 |  | $ | 7.54 |  |  | $ | 7,029 |
The following is a summary of stock options vested and exercisable as of December 31, 2014:
|  |  |  | Weighted Average |  | Weighted |  |
Range of |  | Number |  | Remaining |  | Average |  |
Exercise |  | of |  | Contractual |  | Exercise |  | Intrinsic
Prices |  | Shares |  | Life |  | Price |  | Value
|  |  |  |  |  |  |  | (in thousands)
$3.21 - 6.89 |  | 411,553 |  |  | 3.46 |  | $ | 5.16 |  |  | $ | 7,113 |
$7.13 - 8.17 |  | 81,050 |  |  | 6.54 |  | 7.27 |  |  | 1,226 |
$8.65 - 21.14 |  | 175,527 |  |  | 6.53 |  | 8.76 |  |  | 2,392 |
Total |  | 668,130 |  |  | 4.64 |  | $ | 6.36 |  |  | $ | 10,731 |
The following is a summary of stock options vested and exercisable as of December 31, 2013:
|  |  |  | Weighted Average |  | Weighted |  |
Range of |  | Number |  | Remaining |  | Average |  |
Exercise |  | of |  | Contractual |  | Exercise |  | Intrinsic
Prices |  | Shares |  | Life |  | Price |  | Value
|  |  |  |  |  |  |  | (in thousands)
$3.21 - 6.89 |  | 422,003 |  |  | 4.09 |  | $ | 4.85 |  |  | $ | 6,941 |
$7.13 - 8.17 |  | 63,225 |  |  | 7.45 |  | 7.24 |  |  | 889 |
$8.65 - 9.34 |  | 97,887 |  |  | 8.38 |  | 8.65 |  |  | 1,238 |
Total |  | 583,115 |  |  | 5.17 |  | $ | 5.75 |  |  | $ | 9,068 |
A summary of option activity under the plan is as follows:
|  |  | Weighted Average Exercise
Options | Shares |  | Price
Outstanding at December 31, 2014 | 1,233,911 |  |  | $ | 8.16 |
Granted | 363,895 |  |  | 22.79 |
Exercised | (435,562 | ) |  | 6.42 |
Forfeited or Expired | (31,334 | ) |  | 14.02 |
Outstanding at December 31, 2015 | 1,130,910 |  |  | $ | 13.38 |
Exercisable at December 31, 2015 | 448,371 |  |  | $ | 7.54 |
The total intrinsic value of options exercised during December 31, 2015, 2014 and 2013 was $7.4 million, $2.8 million and $2.7 million, respectively. The cash received from options exercised during December 31, 2015, 2014 and 2013 was $2.8 million, $1.3 million and $1.5 million, respectively. The impact of these cash receipts is included in financing activities in the accompanying Consolidated Statements of Cash Flows. Since 2007, as part of the LTIP, the Compensation Committee of the Board of Directors has authorized and issued restricted stock awards to directors and key employees. Restricted stock awards granted to directors vest one-third each year. All other restricted stock awards vest at a rate of 20% per year. The fair value of restricted stock awards is based on the fair market value of AAON common stock on the respective grant dates, reduced for the present value of dividends. These awards are recorded at their fair value on the date of grant and compensation cost is recorded using straight-line vesting over the service period. At December 31, 2015, unrecognized compensation cost related to unvested restricted stock awards was approximately $4.7 million which is expected to be recognized over a weighted average period of 1.99 years. A summary of the unvested restricted stock awards is as follows:
|  |  | Weighted Average Grant date
Restricted stock | Shares |  | Fair Value
Unvested at December 31, 2014 | 414,846 |  |  | $ | 16.76 |
Granted | 134,346 |  |  | 22.22 |
Vested | (115,885 | ) |  | 15.61 |
Forfeited | (23,284 | ) |  | 18.46 |
Unvested at December 31, 2015 | 410,023 |  |  | $ | 18.78 |
A summary of share-based compensation is as follows for the years ending December 31, 2015, 2014 and 2013:
| 2015 |  | 2014 |  | 2013
Grant date fair value of awards during the period: | (in thousands)
Options | $ | 3,685 |  |  | $ | 817 |  |  | $ | 841 |
Restricted stock | 2,985 |  |  | 5,024 |  |  | 2,306 |
Total | $ | 6,670 |  |  | $ | 5,841 |  |  | $ | 3,147 |
| 2015 |  | 2014 |  | 2013
Share-based compensation expense: | (in thousands)
Options | $ | 833 |  |  | $ | 898 |  |  | $ | 1,170 |
Restricted stock | 2,058 |  |  | 1,280 |  |  | 593 |
Total | $ | 2,891 |  |  | $ | 2,178 |  |  | $ | 1,763 |
| 2015 |  | 2014 |  | 2013
Income tax benefit related to share-based compensation: | (in thousands)
Options | $ | 2,165 |  |  | $ | 979 |  |  | $ | 715 |
Restricted stock | 280 |  |  | 260 |  |  | 128 |
Total | $ | 2,445 |  |  | $ | 1,239 |  |  | $ | 843 |

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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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