Stock-Based Compensation (Tables)

6 Months Ended

Jun. 30, 2013

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

Schedule of valuation assumptions for stock options

The fair value of the option grants are estimated on the date of grant using the Black-Scholes option pricing model with the following weighted-average assumptions, as indicated by year:



	2013
Dividend yield	0.6	%
Expected volatility	33.63	%
Risk-free interest rate	0.41	%
Expected life (years)	3.56

Assumptions for the fair value of the right (option) to purchase shares under ESPP

The fair value of the right (option) to purchase shares under the ESPP is estimated on the date of grant (January 1, 2013) associated with the four quarterly purchase dates using the following assumptions:



	2013
Dividend yield	0.6	%
Expected volatility	31	%
Risk-free interest rate	0.08%, 0.12%, 0.135%, 0.15%
Expected life (years)	0.25, 0.50, 0.75, 1.00