Stock-Based Compensation

6 Months Ended

Jun. 30, 2013

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

Stock-Based Compensation

 Stock-Based Compensation

At June 30, 2013, there were 2,935,331 shares remaining in the 2011 Omnibus Incentive Compensation Plan (the “2011 Plan”) for future grants. The 2011 Plan provides for the granting of stock options, stock appreciation rights, restricted stock awards and performance awards to employees and non-employee directors. The Compensation Committee of the Board of Directors determines the terms and conditions of awards to be granted.  Vesting requirements vary by award.

In the first half of 2013, we granted 461,174 stock options at a weighted average exercise price of $59.43 per share based on the grant-date fair value of our stock to key employees under the 2011 Plan. Stock options granted to employees vest in equal annual increments over four years of continuous service. All awards expire ten years from the date of grant. The weighted average grant date fair value of options granted was $11.46 per share as determined by the Black-Scholes option valuation model using the following weighted average assumptions: a risk-free interest rate of 0.89%; expected life of 6 years based on prior experience; stock volatility of 22.5% based on historical data; and a dividend yield of 1.3%. Stock option expense is recognized over the vesting period, net of forfeitures.

In addition, during the first half of 2013, we granted 88,476 performance-vesting share (“PVS”) awards at a weighted grant-date fair value of $59.42 per share to key employees under the 2011 Plan. Each PVS award entitles the holder to one share of our common stock if the annual growth rate of revenue and return on invested capital targets are achieved over a three-year performance period. The actual payout may vary from 0% to 200% of an employee’s targeted award. The fair value of PVS awards was based on the market price of our stock at the grant date and is recognized as an expense over the performance period, adjusted for estimated target outcomes and net of forfeitures.

Total stock-based compensation expense was $5.0 million and $10.4 million for the three and six months ended June 30, 2013, respectively. For the three and six months ended June 30, 2012, total stock-based compensation expense was $4.3 million and $7.5 million, respectively.