Stock-Based Compensation

12 Months Ended

Dec. 31, 2015

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Note J. Stock-Based Compensation

The CNAF Incentive Compensation Plan (the Plan), as amended and restated on January 1, 2010, authorizes the grant of stock-based compensation to certain management personnel for up to 6 million shares of CNAF's common stock. The Plan currently provides for awards of stock options, stock appreciation rights (SARs), restricted shares, restricted stock units (RSUs), performance-based RSUs and performance share units. The number of shares available for the granting of stock-based compensation under the Plan as of December 31, 2015 was approximately 1.1 million.

The Company recorded stock-based compensation expense related to the Plan of $14 million, $11 million and $10 million for the years ended December 31, 2015, 2014 and 2013. The related income tax benefit recognized was $5 million, $4 million and $3 million for the years ended December 31, 2015, 2014, and 2013. The compensation cost related to non-vested awards not yet recognized was $10 million, and the weighted average period over which it is expected to be recognized is 1.5 years as of December 31, 2015.

Equity based compensation that is not fully vested prior to termination is generally forfeited upon termination, except as otherwise provided by contractual obligations. In addition, any such compensation that vested prior to termination is generally canceled immediately, except in cases of retirement, death or disability, and as otherwise provided by contractual obligations.

Share Awards

The fair value of share awards is based on the market value of the Company's common stock as of the date of grant. Share awards currently granted under the Plan include RSUs, performance-based RSUs and performance share units. Generally, RSU's vest ratably over a four-year service period following the date of grant. Performance-based RSUs generally become payable within a range of 0% to 100% of the number of shares initially granted based upon the attainment of specific annual performance goals and vest ratably over a four-year service period following the date of grant. Performance share units become payable within a range of 0% to 200% of the number of shares initially granted based upon the attainment of specific performance goals achieved over a three year period.

The following table presents activity for non-vested RSUs, performance-based RSUs and performance share units under the Plan in 2015.



	Number of Awards		Weighted-Average Grant Date Fair Value
Balance as of January 1, 2015	914,181		$	32.76
Awards granted	301,057		41.04
Awards vested	(429,352	)	29.54
Awards forfeited, canceled or expired	(6,546	)	37.53
Performance-based adjustment	(44,077	)	37.47
Balance as of December 31, 2015	735,263		$	36.53

SARs

The exercise price of all SARs granted is based on the market value of the Company's common stock as of the date of grant. SARs generally vest ratably over a four-year service period following date of grant and have a maximum term of ten years.

The fair value of granted SARs was estimated at the grant date using the Black-Scholes option-pricing model. The Black-Scholes model incorporates a risk free rate of return and various assumptions regarding the underlying common stock and the expected life of the securities granted. Different interest rates and assumptions were used for each grant, as appropriate based on date of grant.

There were no SARs granted for the years ended December 31, 2015 and 2014. As of December 31, 2015, there were approximately 1 million awards outstanding, fully vested and expected to vest and be exercisable. The grant date fair value of SARs vested was $1 million for the years ended December 31, 2014 and 2013.