Stock-Based Compensation Plans
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Dec. 31, 2014
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Disclosure of Compensation Related Costs, Share-based Payments [Abstract] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Stock-based compensation plans |
The following table presents compensation expense and related tax benefits for all equity awards recognized in the consolidated statements of income:
The tax benefit shown in the preceding table is less than the benefit that would be calculated using the Corporation’s 35% statutory federal tax rate. Tax benefits are only recognized over the vesting period for awards that ordinarily will generate a tax deduction when exercised, in the case of non-qualified stock options, or upon vesting, in the case of restricted stock. The Corporation did not grant any non-qualified stock options in 2014. Non-qualified stock options granted in 2013 and 2012 were 50,000 and 15,000 non-qualified stock options, respectively. The following table presents compensation expense and related tax benefits for restricted stock awards, RSUs and PSUs recognized in the consolidated statements of income, and included as a component of total stock-based compensation within the preceding table:
The following table provides information about stock option activity for the year ended December 31, 2014:
The following table provides information about nonvested stock options, restricted stock, RSUs and PSUs granted under the Employee Option Plan and Directors' Plan for the year ended December 31, 2014:
As of December 31, 2014, there was $7.4 million of total unrecognized compensation cost related to nonvested stock options, restricted stock, RSUs and PSUs that will be recognized as compensation expense over a weighted average period of two years. As of December 31, 2014, the Employee Option Plan had 11.4 million shares reserved for future grants through 2023 and the Directors’ Plan had 410,000 shares reserved for future grants through 2021. The following table presents information about stock options exercised:
Upon exercise, the Corporation issues shares from its authorized, but unissued, common stock to satisfy the options. The fair value of stock option awards under the Employee Option Plan was estimated on the grant date using the Black-Scholes valuation methodology, which is dependent upon certain assumptions, as summarized in the following table:
The expected life of the options was estimated based on historical activity. Volatility of the Corporation’s stock was based on historical volatility for the period commensurate with the expected life of the options. The risk-free interest rate is the zero-coupon U.S. Treasury rate commensurate with the expected life of the options on the date of the grant. Based on the assumptions above, the Corporation calculated an estimated fair value per option of $3.14, $2.49 and $2.22 for options granted in 2014, 2013 and 2012, respectively. The Corporation granted 288,626 options in 2014, 617,869 options in 2013 and 470,528 options in 2012. The fair value of certain PSUs with market based performance conditions granted in 2014 under the Employee Option Plan was estimated on the grant date using the Monte Carlo valuation methodology performed by a third-party valuation expert, which is dependent upon certain assumptions, as summarized in the following table:
The expected life of the PSUs with fair values measured using the Monte Carlo valuation methodology was based on the defined performance period of three years. Volatility of the Corporation’s stock was based on historical volatility for the period commensurate with the expected life of the PSUs. The risk-free interest rate is the zero-coupon U.S. Treasury rate commensurate with the expected life of the PSUs on the date of the grant. Based on the assumptions above, the Corporation calculated an estimated fair value per PSU granted in 2014 of $10.33. Under the ESPP, eligible employees can purchase stock of the Corporation at 85% of the fair market value of the stock on the date of purchase. The ESPP is considered to be a compensatory plan and, as such, compensation expense is recognized for the 15% discount on shares purchased. The following table summarizes activity under the ESPP:
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