Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2014

Summary of Significant Accounting Policies

Fair value of stock options has been estimated at the date of grant using the Black-Scholes option-pricing model with the following weighted-average assumptions:

	2014		2013		2012
Risk free interest rate	1.6	%	0.9	%	0.8	%
Expected life	4.6 years		4.6 years		4.6 years
Expected volatility	21.0	%	28.0	%	30.0	%
Expected dividend yield	1.0	%	1.0	%	0.8	%